Local Urban Development Research Articles

Satellite Reveals a Coupling between Forest Displacement and Landscape Fragmentation across the Economic Corridor of the Eurasia Continent

Jointly building the Economic Corridor of the Eurasia Continent (ECEC), which is one of the most important parts of the Silk Road Economic Belt, is a pivotal initiative for fostering regional development. Forests, which serve as a green foundation of economic resilience, underpin this effort. However, there is an imbalance in ecological status due to differences in natural resources and the social economy along the economic corridor. This imbalance has led to alterations in landscapes, yet the specific changes and their underlying relationships are still much less understood. Here, we quantitatively detected changes in the forest landscape and its ecological efforts over the ECEC via widespread, satellite-based and long-term land cover maps released by the European Space Agency (ESA) Climate Change Initiative (CCI). Specifically, the coupling between changes in forest coverage and landscape patterns, e.g., diversity, was further examined. The results revealed that forest coverage fluctuated and declined over the ECEC from 1992 to 2018, with an overall reduction of approximately 9784.8 km2 (i.e., 0.25%). Conversions between forests and other land cover types were widely observed. The main displacements occurred between forests and grasslands/croplands (approximately 48%/21%). Moreover, the landscape diversity in the study area increased, as measured by the effective diversity index (EDI), during the study period, despite obvious spatial heterogeneity. Notably, this pattern of landscape diversity was strongly associated with forest displacement and local urban development through coupling analysis, consequently indicating increasing fragmentation rather than biological diversity. This study highlights the coupled relationship between quantitative and qualitative changes in landscapes, facilitating our understanding of environmental protection and policy management.

Optimizing entropy weight model to accurately predict variation of pharmaceuticals and personal care products in the estuaries and coasts of the South China

Pharmaceuticals and personal care products (PPCPs) have raised increasing concern worldwide due to their continuous release and potential hazards to the ecosystem and human health. This study optimized the entropy weight model (EW-WRSR) that combines entropy weight with multi-criteria decision analysis to investigate pollution patterns of PPCPs in the coasts and estuaries. The results revealed that occurrences of PPCPs from the 1940s to the present were consistent with using PPCPs, different types of human activities, and local urban development. This helped better understand the history of PPCP contamination and evaluate the uncertainty of EW-WRSR. The model predicted hotspots of PPCPs that were consistent with the actual situation, indicating that PPCPs mainly enter the nearshore ecosystem by the form of sewage discharge and residual aquaculture. This study can provide method that identifying highly contaminated regions on a global scale.

Evaluating the impact of evolving green and grey urban infrastructure on local particulate pollution around city square parks

The relationship between green and grey urban infrastructure, local meteorological conditions, and traffic-related air pollution is complex and dynamic. This case study examined the effect of evolving morphologies around a city square park in Dublin and explores the twin impacts of local urban development (grey) and maturing parks (green) on particulate matter (PM) pollution. A fixed air quality monitoring campaign and computational fluid dynamic modelling (ENVI-met) were used to assess current (baseline) and future scenarios. The baseline results presented the distribution of PM in the study area, with bimodal (PM2.5) and unimodal (PM10) diurnal profiles. The optimal vegetation height for air quality within the park also differed by wind direction with 21 m vegetation optimal for parallel winds (10.45% reduction) and 7 m vegetation optimal for perpendicular winds (30.36% reduction). Increased building heights led to higher PM2.5 concentrations on both footpaths ranging from 25.3 to 37.0% under perpendicular winds, whilst increasing the height of leeward buildings increased PM2.5 concentrations by up to 30.9% under parallel winds. The findings from this study provide evidence of the importance of more in-depth analysis of green and grey urban infrastructure in the urban planning decision-making process to avoid deteriorating air quality conditions around city square parks.

Research on the impact of China’s free trade zone policies on urban economic development

ABSTRACT The paper explores the impact of China’s free trade zone policies on urban economic development by way of the time-varying DID model using the annual panel data of 284 cities from 2010 to 2019. Through the study, it is found that the free trade zone policies have effectively promoted urban economic growth. Moreover, it is found that: (1) the pilot cities implementing free trade zone policies have registered economic growth via the mediating effect of foreign trade; (2) the free trade zone policies exert more obvious influential effect on eastern and coastal cities; (3) the relatively loose scope of free trade zones can more effectively promote the local urban economic development.

On the Interpretation of National Cultural Elements in Visual Communication

With the development of market economy and the progress of scientific progress, visual communication design has also entered a new period of modern development. At the same time, visual communication design also presents diversified characteristics. Entering a new era, the cultural construction has been promoted to a new historical height by the Party Central Committee. China s cultural construction has also made relatively high achievements, showing a vivid picture of more prosperous and vigorous development of culture. This requires the full combination of local national culture and visual communication design, which can not only provide better services for local urban development and brand publicity, but also play an important role in driving the local market economy.

Hydro-climatic extremes shift the hydrologic sensitivity regime in a cold basin

Escalating climate extreme events disrupt hydrological processes by affecting both water availability and sediment dynamics. However, the interconnection between hydrological variability and climatic extremes remains underexplored, particularly in cold regions under a changing climate. Here, we develop a yield-based dichotomy framework to examine the impact of shifted climatic extreme patterns on hydrological regimes in the Ishikari River Basin (IRB), Hokkaido, Japan, which is a crucial area for local agriculture and urban development. Utilizing a modified Soil and Water Assessment Tool (SWAT) integrated with downscaled CMIP6-GCM climate projections under Shared Socioeconomic Pathways (SSPs) scenarios, we identified significant annual variability in water and sediment yields associated with extreme climate events. Hot-dry conditions correlate with lower water and sediment yields, whereas increased cold extremes may result in higher sediment yields across the IRB. Our findings also indicate that hotter and drier patterns interact with hydrological processes, potentially establishing new hydrologic regimes and shifting climatic extremes-induced thresholds for yield classification within the IRB. Notably, under SSP585, both water availability and sediment transport are projected to intensify, increasing flood risks and exacerbating sedimentation challenges. Our study highlights the urgent need for adaptive water management strategies to address these anticipated changes in hydrological regimes in response to global climate change.

Joint City: cross-border planning diffusion, local elites, and planning practices – case studies of Kouang-Tchéou-Wan and Swatow, 1898–1945

ABSTRACT This comparative study on urban planning in Kouang-Tchéou-Wan (Guangzhou Wan) and Swatow (Shantou) in the first half of the twentieth century can offer insights into the dialogue between colonial and historic cities. Kouang-Tchéou-Wan and Swatow are cities that features ‘collaboration’ – between the government and local elites in urban modernization. This collaboration significantly impacted the adaptation and expression of urban planning in new temporal and spatial environments. The collaboration occurred in ‘underdeveloped public domains’, including public institutions and spaces. This study confidently offers the following conclusions. First, negotiation plays an essential role in ‘collaboration’: the Municipal Council is identified as the primary organization responsible for negotiations; realism, project feasibility, and mutual interests are the main themes of these negotiations. Second, ‘collaboration’ can create irreconcilable contradictions in the landscape, which can be seen as the result of specific historical contexts: the struggle for discourse in public spaces and the transition from spatial zoning to new class categorizations. This study further discusses necessary conditions for a dialogue between colonial and historical cities: being at a similar ‘nation-locality’ transformation stage, such as decentralization from the state to the localities; close communication within regional societies; similar local social environments and urban development foundations.

Does Reduced Space Result in Fewer Rights? Controlled Shrinking in the Urban Renewal of Genoa

This article explores three examples of urban design initiatives in Genoa in an attempt to highlight the potential and possible contradictions that controlled shrinking projects pose for the future of contemporary cities. Genoa, a symbol of Italian shrinking cities, has been strongly defined over the years by post-industrialisation transformations and by long-standing conditions of urban shrinkage. Despite facing continuous shrinkage, local urban development policies have historically focused exclusively on urban growth and expansion. Only recently have some areas in Genoa started to adopt spatial planning experiences that actively pursue degrowth policies, aiming to reduce existing urban fabric and decrease urban density. These initiatives are adopted in specific areas affected by demographic decline, hydrogeological risks, pollution, or catastrophic events. These spatial strategies justify their existence by invoking concepts like smart shrinkage and degrowth, promising improvements in both environmental and social conditions. However, this article notes how these concepts in Genoa are not aligned with the actual social and environmental challenges that these considerations and positions pose. In fact, the urban renewal initiatives introduced by institutions, in reality, lean towards a strategy of shrinkage and demolition of residential complexes, transportation infrastructure, and productive spaces, with diverse and conflicting results. The observed controlled shrinking projects neglect the synthesis of the territory as a palimpsest, ignore new ecological sensitivities, and lack awareness of the social implications associated with the concepts of smart shrinkage and degrowth. Instead, the three instances introduce a spatial project that still adheres to the underlying principles of growth and exploitation, presenting a shrinkage of the existing urban fabric that is mere illusion. It involves clearing out the deteriorated spaces only to fill them with capitalist rhetoric and models that, instead of creating space, undermine fundamental rights. Nonetheless, a closer examination of these three missed opportunities sheds light on the necessary knowledge, actions, and design approaches for a city to navigate urban shrinkage adeptly. This exploration also reveals the potential for the city to transform into a framework and platform, inspiring and guiding new urban planning paradigms for sustainable development.

A residential property appreciation and bank financing feasibility for acquisition in Hermosillo, Sonora

This study focuses on the Capital Gain of residential housing and its feasibility through bank financing in Hermosillo, Sonora. The purpose is to analyze the evolution of capital gain in the residential market and assess its possibility of acquisition through bank financing in the region. The main methodology includes a historical analysis of housing prices and a comprehensive evaluation of the current financing conditions provided by local banks. Key findings highlight a sustained increase in the capital gain of residential properties in Hermosillo. Economic and developmental factors have contributed to this constant growth. Furthermore, it has been proven that bank financing is a viable alternative for those interested in acquiring homes in this area. The capital gain in Hermosillo presents a promising outlook for both investors and buyers alike. The upward trend in housing prices, supported by favorable conditions in the local economy and urban development, highlights the potential for investment in the region. The availability of bank financing further facilitates access to the acquisition of residential properties, making it appealing for those seeking to invest in real estate in Hermosillo. In conclusion, this study underscores the viability of acquiring residential properties through bank financing and emphasizes the importance of considering capital gain as a valuable indicator in real estate decision-making in Hermosillo, Sonora.

Российско-американское научное сотрудничество в Арктике в эпоху геополитической турбулентности

Introduction. The article examines cooperation between Russia and the US on Arctic research in the context of the Ukrainian crisis. One of the accompanying tasks is to study the motivations of both sides for continuing such cooperation. Methods and materials. The article uses the so-called liberal intergovernmental approach as a research method, aiming to explain the reasons for cooperation between countries with different socio-political structures and national interests on the world stage. The empirical basis for the study was the documents of international organizations, US and Russian state institutions, as well as research organizations in Russia and the US involved in the study of the Arctic. Analysis. The article demonstrates that currently there are four main levels of US-Russian scientific cooperation in the Arctic: interpersonal (individual), institutional (between various Russian and American organizations), state (government exchange programs), and international (within the framework of multilateral organizations of a global and regional nature). Results. It is concluded that despite the unfriendly actions taken by the US against Russian scientists and organizations, the “mechanism of interdependence” created in previous years did not allow to completely interrupt scientific ties between these countries. Both sides are well aware of the value of cooperation in this area and therefore try to maintain certain channels of interaction. Natural science topics (climate change, meteorology, environmental protection, biodiversity conservation, oceanology, glaciology, etc.) dominate the priorities of US-Russian scientific cooperation in the Arctic. However, socio-humanitarian and interdisciplinary issues (local communities, indigenous peoples, gender studies, urban development and planning, etc.) have recently become increasingly important. The authors believe that scientific cooperation between Russia and the US in the Arctic will revive as the international situation and bilateral relations between the two countries normalize after the settlement of the Ukrainian conflict. Authors’ contribution. V.N. Konyshev: Introduction and Analysis. A.A. Sergunin: Abstract, methods and materials, results, and design of the scientific apparatus.

Exogenous mobile genetic elements and their associated integrons drive the enrichment of antibiotic-resistant genes in the river of a valley basin city (Lanzhou, China).

River is a unique source of drinking water in valley-type cities, affecting local urban development and human lifestyles. However, the key driving factors for dissemination of antibiotic-resistant genes (ARGs) in valley-type urban environments remain unclear. This study aimed to investigate the distribution of ARGs in the Yellow River and to clarify the driving factors of ARGs in a typical valley basin city (Lanzhou, China). The seven selected ARGs with higher abundances including tetracycline resistance genes (tetM, tetX), macrolide resistance genes (ermB, ermF, ereA), and sulfonamide resistance genes (sul1, sul2) were detected. The results showed that the total absolute abundance of all the selected ARGs varied from 9.97 × 1012 to 1.04 × 1015 copies/L in the water body, with higher abundances in the wet season, relative to the dry season. Among these, sulfonamide resistance genes (sul1, sul2) displayed the highest absolute abundance in the river and soil. The ARGs and mobile genetic elements (MGEs) were significantly correlated with bacterial abundance, dissolved organic carbon (DOC), ammonia nitrogen (NH4+), and total nitrogen (TN) levels in the water environment (Mantel test, P < 0.01). Structural equation modeling revealed the direct input of point-source and nonpoint-source ARGs in this area contributed less to the overall level of the ARGs in the water. Among the multiple drivers, the MGEs derived from wastewater treatment plant and anthropogenic nonpoint area positively and directly affected the ARG profiles in water (P < 0.01), rather than the factors of bacterial abundance and physicochemical properties. According to this study, the exogenous MGEs from anthropogenic activities are the main driver for the enrichment of ARGs in the valley-type urban river environment.

The Image and Mission of Geographical Science in Ukraine

The image of Ukrainian geography is formed in the difficult conditions of the establishment of statehood, deep political and economic reforms, and geopolitical and military resistance to russian aggression. Geographical science still does not sufficiently respond to the contemporary demands of society for geographical information and geographical knowledge. The reformation of national science and education presents geographers with many new problems that need to be considered and solved. The latest information technology revolution, along with new technical capabilities, means more and deep complex requests for geographic information. The paper considers the mentioned issues. The authors focus attention on the features of the transformation of the functions of geographical science in the conditions of post-industrial society and new people’s interaction with natural systems. The technological findings created by modern society are a prospect for the implementation of many solutions in the sphere of sustainable economic, social, and ecological development, as well as the transition to new models of production and consumption, and adaptation to climate change. The paper mentioned that geography plays a significant role in the development of organizational plans and business models in EU countries in such areas as regional and local development, urban and community planning and development, emergency risk management, and transition to a circular economy. In Ukraine, unfortunately, geography, like other sciences such as mathematics and physics, is increasingly perceived as part of basic education. Public demand and the market for projects are practically not formed, which causes both gaps in the implementation of numerous EU directives and international standards, as well as the decline of the discipline. Currently, the war with Russia is definitely the one of the bitter phenomena that requires the involvement of geographers. The first reaction of scholars took place as early as 2014, which was reflected in the adjustment of several educational programs, including human geography, political geography, urban geography, landscape ecology, spatial planning and development, cartographic modeling and GIS, geography of transport systems, population settlement, etc. Simultaneously, today Ukrainian geographers talk about large-scale changes in research priorities, focusing on the assessment of losses and the potential for the restoration of territories, the sustainable development of cities and regions, and geostrategization.

Analysis of Spatial-Temporal Changes and Driving Factors of Vegetation Coverage in Jiamusi City

This study of vegetation coverage in Jiamusi City provides theoretical support for local urban development, land use, and ecological environmental protection. Based on the land cover data and Landsat remote sensing image data from 2000 to 2020, the vegetation cover and land use data of Jiamusi City were extracted. The study includes the following aspects: (1) an analysis of the spatio-temporal changes in vegetation coverage; (2) analysis of the land use situation in Jiamusi City; and (3) investigation of the impact of natural and human factors on vegetation coverage in Jiamusi City using the Geodetector model. The results show that (1) over the past 20 years, the vegetation coverage of Jiamusi has shown a decreasing trend, declining from 25.22% in 2000 to 17.13% in 2020, representing a decrease of 32%. In terms of spatial distribution, the areas of Fuyuan City and Tongjiang City have experienced more significant decreases in vegetation coverage, decreasing by 73.6% and 54.0%, respectively. (2) The land use pattern of Jiamusi City has undergone significant changes during the study period; except for paddy fields (PF), unused land (UL), and construction land (CL), the areas of all the land categories have decreased. The ranking of the single land use dynamic degree in terms of magnitude is as follows: PF, UL, CL, dry farmland (DF), vegetation coverage land (VCL), and wetland (WET). (3) The changes in vegetation coverage were influenced by both natural and human activities and, according to the Geodetector results, the main influencing factors were CL and DF. The key findings of this study emphasize the need for comprehensive land use planning and ecological environmental protection that focus on sustainable development and conservation practices, and lay the groundwork for future ecosystem management and urban planning efforts in Jiamusi City.

Monitoring and Modeling of Spatio-Temporal Urban Expansion and Land Use/Land-Cover Change in Mountain Landscape: A Case Study of Dalat City, Vietnam

The lack of ability to control human activities led to changes of land use/land cover (LULC) in Dalat City where rapid urbanization and the demand to expand agricultural land have resulted in dramatic forest reductions. This study assessed the rate and extent of LULC changes over the past 12 years and simulated future scenarios in Dalat City, Lam Dong Province, Vietnam by using an integrated model of Markov chain and logistics regression. Three land-use maps used to analyze land-use change were extracted from satellite images in 2010, 2016, and 2022 by classification approach. The outcome of this process indicates a significant increase in agricultural and built-up land of 48.22 km2 and 9.36 km2, respectively; a decrease in forest land of 55.61 km2, and a minor change in water bodies and bare land in the 2010-2022 period. Prediction maps of land-use change in 2028 and 2034 are generated after the model is validated by comparing the actual map with the prediction map of LULC in 2022 using Kappa statistics. Transition of forest area to other land use types, especially land for expansion of built-up and agricultural land is the crucial trend of land-use change in the future according to the forecast model. Compared to 2022, forest area in 2034 will decrease by 60.65 km2 while built-up and agricultural land will increase by 14.07 km2 and 43.61 km2, respectively. The research results provide valuable information as a foundation for land-use policy planning and local urban development to ensure sustainable development objectives.

Potential Use of Rendering Mortar Waste Powder as a Cement Replacement Material: Fresh, Mechanical, Durability and Microstructural Properties

The difficulty of decomposing solid waste over time has made it a significant global problem because of its environmental impact and the need for large areas for disposal. Among these residues is the waste of the rendering mortar that is produced (falls to the ground) while applied to wall surfaces. The quantity of these materials may reach 200 to 500 g/m2. As a result of local urban development (in Iraq), thousands of tons of these wastes are produced annually. On the other hand, the emission of greenhouse gases in the cement industry has had a great environmental impact. One of the solutions to this problem is to reduce the cement content in the mix by replacing it with less emissive materials. Residues from other industries are considered a relatively ideal option due to their disposal on the one hand and the reduction of harmful emissions of the cement industry on the other hand. Therefore, this research aims to reuse rendering mortar waste powder (RMWP) as a possible alternative to cement in mortar. RMWP replaced the cement in proportions (0, 10, 15, 20, 25, and 30% by weight). The flow rate, flexural and compressive strengths, ultrasonic pulse velocity, bulk density, dynamic modulus of elasticity, electrical resistivity, and water absorption tests of the produced mortar were executed. Microstructural analysis of the produced mortar was also investigated. Results indicated that, for sustainable development, an eco-friendly mortar can be made by replacing cement with RMWP at a rate of 15%, resulting in a 17% decrease in compressive strength while maintaining or improving durability properties. Moreover, the microstructure became denser and more homogeneous in the presence of RMWP.

Telecoupling indirect ecological impacts of urban expansion in China from the perspective of the food trade

AbstractA comprehensive evaluation of the ecological cost of urban expansion is crucial for preventing ecosystem degradation and improving ecosystem governance. However, the indirect impacts of urban expansion through cropland displacement are grossly underestimated, particularly the spillover effects on distant regions. This study proposed a telecoupling framework for the total indirect ecological losses (TIEL) of urban expansion. It was divided into the near losses (NIEL) and distant losses (DIEL), depending on whether cropland displacement occurs inside or outside the region. An inter‐provincial network of DIEL can also be constructed by ecological impact embodied in food trade with other regions. We found that approximately 80% of urban expansion occurred on croplands, which caused indirect loss of 86,586 km2 of ecological land through cropland displacement in China during 2000–2019. The total indirect ecological losses were 8.4 times greater than direct losses at the average of all provinces. Food trade induced more serious indirect ecological losses owing to the higher yield difference between encroached cropland import regions and new cropland in export regions. The proportion of DIEL in TIEL was more than 50% in developed regions such as Beijing, Shanghai, Tianjin, and Jiangsu. The distant impacts of urban expansion in the eastern coastal provinces were mainly transferred to north‐eastern China and the rest of the world. This study identified the teleconnection between local urban development and distant environments and infromed inter‐regional ecological compensation policies to mitigate regional inequalities.

A Case Study of Tramline Analysis with Transit-Oriented Development Approach: Bursa T2 Tramline

The article highlights the importance of transportation systems in urbanization processes, especially in densely populated cities where the need for transportation and infrastructure systems arises as cities spread towards their peripheries. Public transportation systems' priority transportation policies are developed by local governments to meet accessibility at the optimum level, minimize harmful environmental effects, and save time and cost. Transit-oriented development (TOD) is a planning approach adopted in many cities to reduce private vehicle use by developing public transit stations around high-density mixed land use and walkable environments. This study assesses the potential for TOD development at eleven stations of the T2 tram line on the Bursa-Istanbul road, using the 6Ds of built environment variables as indicators and GIS methods and applications to measure all spatial indicators. TOD indexes were examined for each station to identify potential improvement strategies, and each station was classified as having a high, medium, or low TOD index. By understanding the specific strategies for different TOD indices, this article aims to support development areas to improve local urban development towards higher TOD levels.

Assessment of Wildfire Susceptibility and Wildfire Threats to Ecological Environment and Urban Development Based on GIS and Multi-Source Data: A Case Study of Guilin, China

The frequent occurrence and spread of wildfires pose a serious threat to the ecological environment and urban development. Therefore, assessing regional wildfire susceptibility is crucial for the early prevention of wildfires and formulation of disaster management decisions. However, current research on wildfire susceptibility primarily focuses on improving the accuracy of models, while lacking in-depth study of the causes and mechanisms of wildfires, as well as the impact and losses they cause to the ecological environment and urban development. This situation not only increases the uncertainty of model predictions but also greatly reduces the specificity and practical significance of the models. We propose a comprehensive evaluation framework to analyze the spatial distribution of wildfire susceptibility and the effects of influencing factors, while assessing the risks of wildfire damage to the local ecological environment and urban development. In this study, we used wildfire information from the period 2013–2022 and data from 17 susceptibility factors in the city of Guilin as the basis, and utilized eight machine learning algorithms, namely logistic regression (LR), artificial neural network (ANN), K-nearest neighbor (KNN), support vector regression (SVR), random forest (RF), gradient boosting decision tree (GBDT), light gradient boosting machine (LGBM), and eXtreme gradient boosting (XGBoost), to assess wildfire susceptibility. By evaluating multiple indicators, we obtained the optimal model and used the Shapley Additive Explanations (SHAP) method to explain the effects of the factors and the decision-making mechanism of the model. In addition, we collected and calculated corresponding indicators, with the Remote Sensing Ecological Index (RSEI) representing ecological vulnerability and the Night-Time Lights Index (NTLI) representing urban development vulnerability. The coupling results of the two represent the comprehensive vulnerability of the ecology and city. Finally, by integrating wildfire susceptibility and vulnerability information, we assessed the risk of wildfire disasters in Guilin to reveal the overall distribution characteristics of wildfire disaster risk in Guilin. The results show that the AUC values of the eight models range from 0.809 to 0.927, with accuracy values ranging from 0.735 to 0.863 and RMSE values ranging from 0.327 to 0.423. Taking into account all the performance indicators, the XGBoost model provides the best results, with AUC, accuracy, and RMSE values of 0.927, 0.863, and 0.327, respectively. This indicates that the XGBoost model has the best predictive performance. The high-susceptibility areas are located in the central, northeast, south, and southwest regions of the study area. The factors of temperature, soil type, land use, distance to roads, and slope have the most significant impact on wildfire susceptibility. Based on the results of the ecological vulnerability and urban development vulnerability assessments, potential wildfire risk areas can be identified and assessed comprehensively and reasonably. The research results of this article not only can improve the specificity and practical significance of wildfire prediction models but also provide important reference for the prevention and response of wildfires.

Assessment of groundwater vulnerability by applying the improved DRASTIC model: a case in Guyuan City, Ningxia, China

Groundwater is the main source of production and living in most arid and semi-arid areas, and it plays an increasingly critical role in achieving local urban development. There is a serious issue regarding the contradiction between urban development and groundwater protection. In this study, we used three different models to assess the groundwater vulnerability of Guyuan City, including DRASTIC model, analytical hierarchy process-DRASTIC model (AHP-DRASTIC) and variable weight theory-DRASTIC model (VW-DRASTIC). The groundwater vulnerability index (GVI) of the study area was calculated in ArcGIS. Based on the magnitude of GVI, the groundwater vulnerability was classified into five classes: very high, high, medium, low, and very low using the natural breakpoint method, and the groundwater vulnerability map (GVM) of the study area was drawn. In order to validate the accuracy of groundwater vulnerability, the Spearman correlation coefficient was used, and the results showed that the VW-DRASTIC model performed best among the three models (ρ=0.83). The improved VW-DRASTIC model shows that the variable weight model effectively improves the accuracy of the DRASTIC model, which is more suitable for the study area. Finally, based on the results of GVM combined with the distribution of F- and urban development planning, suggestions were proposed for further sustainable groundwater management. This study provides a scientific basis for groundwater management in Guyuan City, which can be an example for similar areas, particularly in arid and semi-arid areas.

Investigation of resource utilization in urbanization development: An analysis based on the current situation of carbon emissions in China

Energy green growth has become China's development goal in this new era of carbon neutrality, and urbanization development must make better use of energy resources. Hence, this paper investigates energy utilization in urbanization development by examining the elements that determine carbon emission intensity, which reflects energy resource consumption, and the theoretical and empirical association between urban development level and carbon emission intensity. Using annual statistics panel data for the provinces of China from 2008 to 2019, we tested a spatial panel model and settled on the spatial Durbin model to examine the effect of urbanization on carbon emissions. The “inverted N-shaped” curve, not the “inverted U-shaped” curve of conventional studies, better describes urbanization's impact on carbon emissions. The distinctiveness of local urban development in China drives this result, which has ramifications for regional policy. According to this study, output-inhibiting impact and environmental resilience mechanisms affect urbanization's aggregation effect and output expansion's emission effect. To further control carbon emission intensity and better use energy resources, this paper recommends better industrial structure adjustment, strengthening the comprehensive use of natural resources during urban development, and reasonable coordination of urban planning to efficiently mobilize energy resources.