Changhai County Research Articles

Risk Factors of Mariculture Supply Chain Based on Green Development: A Case Study of Changhai County in China

China is a global leader in aquaculture, and mariculture has become an important part of Chinese agriculture and one of the important growth points of the rural economy. However, environmental changes and industrial restructuring have brought new risks to the aquaculture supply chain. Recently, people have also paid more and more attention to the marine environment because a good marine environment is the foundation of the healthy development of mariculture. This study analyses the risks in the aquaculture supply chain from the perspective of the marine environment, using Changhai County, Liaoning Province, as an example. The study identified marine environmental issues such as over-sized aquaculture, irrational aquaculture structure, resource integration gaps, nuclear wastewater discharge and offshore oil pollution. Recommendations included restructuring aquaculture, professional training, establishing cooperative mechanisms, and improving seafood quality testing and marine environment monitoring. Addressing these challenges is essential to ensure the stable and healthy development of seafood markets and the sustainability of the aquaculture industry.

Analysis of carbon emission drivers and peak carbon forecasts for island economies

Sea islands are an essential support for expanding the blue economic space, and the study of the carbon emissions of Changhai County's island economies and their carbon peaking time is of great significance for achieving the goal of building an ecological low-carbon demonstration island with northern characteristics in Changhai County. In this study, the Logarithmic Mean Divisia Index (LMDI) method was used to explore the three main drivers affecting the carbon emissions of the island economies in Changhai County. The carbon emissions of Changhai County in 2012–2019 were estimated through the system dynamics model. The low-carbon development path and possible carbon peak time of Changhai County in 2020–2035 were predicted. The results show that: ①The urban system is the first positive driver of carbon emissions, followed by the residential system, and finally, the fishery system, the energy structure effect is the main positive driving effect affecting carbon emissions, and the population effect always shows a negative inhibitory impact on carbon emissions. ②The activities on the islands of Changhai County in 2012–2019 cumulatively produced 167.53 × 104 t of carbon emissions, 46.83 × 104 t of carbon sinks, and their net carbon emissions were 120.69 × 104 t. The results of the future scenario projections show that neither non-intervention nor a single policy of only adjusting land use and transport can achieve minor carbon emissions and that the best path for future low-carbon development in Changhai County is to develop all kinds of activities in a low-carbon (L) mode. ④Among the future forecast scenarios, Scenario 5 is an ideal model for the fastest way to achieve carbon peak, which generates 318.39 × 104 t of carbon emissions, and the cumulative emission reduction reaches 26.37 × 104 t.

Application of a VOF Multiphase Flow Model for Issues concerning Floating Raft Aquaculture

Floating raft aquaculture has gradually become a mainstream aquaculture model in the waters of Changhai County, Dalian. To quantitatively describe the impact of floating raft aquaculture facilities on the hydrodynamic environment of nearby sea areas, in this study, we took a single floating raft aquaculture structure as the research object and built a numerical prediction model for water flows passing through the floating raft aquaculture structure using a six-degree-of-freedom VOF (volume of fluid) multiphase flow simulation method based on an overset moving mesh system. Then, we verified the numerical model by utilizing oblique hydraulic jumps and water flows passing through a submerged bar. As shown by the findings, the simulated values are in good agreement with the theoretical solutions and measured values, indicating that the model features high precision and great stability. The impact of the raft area on the hydrodynamic force was introduced into the source term of an equation for consideration. In order to further determine the hindering effect of the raft body on the water body, transport equations and the tracer method were used to simulate the impact of floating raft aquaculture facilities on the water exchange performance of nearby sea areas. This study shows that the VOF multiphase flow model can be easily and accurately applied to studies on floating raft aquaculture, which can greatly reduce the limitations of experiments that utilize pure hydraulic models, wherein the impacts of floating raft aquaculture facilities on hydrodynamic force are generally considered simply based on observations, water roughness or the secondary drag force coefficient, thereby effectively improving the scientific understanding of the physical mechanism involved in floating raft aquaculture.

Evaluating the accessibility of public service facilities to tourists and residents in island destinations: Evidence from the Changhai County.

With the increasing diversity of social groups, public service facilities need to meet the diverse needs of different groups. However, there is still a lack of in-depth research evaluating urban public service facilities for diverse groups. Therefore, this paper use Kernel density spatial analysis method to delimits the research area based on data on the temporal and spatial behavior of islanders and tourists, and use urban network analysis (UNA) method to evaluates the public service facilities of the spatially overlapping area from the aspects of facility accessibility and availability. The study shows that (1) the spatial dislocation between facilities and residential places is serious, which leads to redundant construction or a lack of configuration of facilities in some areas. (2) The public service facilities in some areas can be used by tourists and residents to a similar degree, the number of facilities accessible to residents and tourists within a certain distance is not much different, and the configuration of facilities is relatively reasonable. (3) The overall configuration of infrastructure is biased toward residents, but the configuration of facilities in some areas can also reflect group fairness. The results indicate that the public facilities have a tendency to serve residents, and the results can give some suggestions for public facilities configuration to build a human-oriented island.

Assessment of changes in environmental factors in a tourism-oriented Island.

Tourism development has influenced industrial structure changes and has become a major driving force for China's new urbanization. However, the development will negatively impact natural resources and the ecological environment and will become an essential driving factor for land use change. Therefore, understanding the impact of tourism urbanization is crucial for sustainable local development. This study selected the Dachangshan Island in the Changhai County, Dalian, China, as the study area, because it is the only coastal island-type border county in China. During the study period, changes in local environmental factors were analyzed based on land use data, Landsat 5 and Landsat 8 data of 2009, 2014, and 2019. The results showed that: (1) the overall land surface temperature (LST) in the research region shows an increasing trend; the LST in 2014 and 2019 increased by 6.10 and 5.94 °C, respectively, compared with 2009. With respect to specific land types, impervious surfaces maintained a high land surface temperature (25.44, 32.38, and 31.86); however, surface temperatures for cropland, forest, grassland, and water bodies remained stable. (2) The land use land cover (LULC) change analysis from 2009-2019 indicates that impervious surfaces and cropland increased by 0.5653 km2 and 0.9941 km2, while the areas of forest, grassland, and water bodies decreased. The results also showed that forests (-1.3703 km2) are most affected by urbanization. (3) The results of the landscape index calculation showed that the variation at the patch scale is different for different LULC types. The patch density of impervious surfaces decreased, but the aggregation index increased over time, while the patch density of the forest increased continuously. At the landscape scale, overall patch type and distribution remained stable. The purpose of this study is to explore the environmental changes of islands and provide a reference for the sustainable development of islands.

The Impact of Floating Raft Aquaculture on the Hydrodynamic Environment of an Open Sea Area in Liaoning Province, China

The sea area of Changhai County in Dalian City is a typical floating raft aquaculture area, located in Liaoning Province, China, where a key issue in determining the scale and spatial layout of the floating raft aquaculture is the assessment of the impact of aquaculture activities on the hydrodynamic environment. To address this issue, we established depth-averaged two-dimensional shallow water equations and three-dimensional incompressible Reynolds-averaged Navier–Stokes equations for the open sea area described in this paper. The impact of floating rafts for aquaculture on hydrodynamic force was reflected in the numerical model by changing the Manning number, where scenarios with different aquaculture densities were taken into account. Finally, the water exchange rate of the floating raft aquaculture area in the study area was calculated. It was found, through a comparison between the simulated value and the measured value obtained via layered observation, that the two values were in good agreement with each other, indicating that the model exhibits great accuracy. In addition, the calculation results for scenarios before and after aquaculture were compared and analyzed, showing that from low-density to high-density aquaculture zones, the variation in flow rate was greater than 80% at the peak of a flood tide. The water exchange rates of the water body after 1 day, 4 days, and 8 days of water exchange were also calculated, and the results show that they had been reduced by 17.92%, 13.59%, and 1.63%, respectively, indicating that the existence of floating rafts for aquaculture indeed reduced the water exchange capacity of the water body. The model described in this paper can serve as a foundation for other studies on aquaculture in open sea areas, and it provides a theoretical basis for the scientific formulation of marine aquaculture plans and the rational optimization of the spatial layout.

Assessment of Recreational and Cultural Ecosystem Services Value of Islands

With the gradual expansion of benefits provided by islands to human wellbeing, it has become increasingly important to quantify the cultural ecosystem service functions of islands. In this study, the zone travel cost method (ZTCM) and individual travel cost method (ITCM) are used to assess the recreational and cultural ecosystem services value of the island region of Changhai County, China, and the recreational value of Xiaochangshan, Dachangshan, and Guanglu Islands based on questionnaire survey data. The results are as follows: (1) The overall recreational and cultural ecosystem services value of Changhai County in 2019 was 533.14 million USD, including a traveling cost of 395.71 million USD and consumer surplus of 137.43 million USD. (2) Further, based on the choice and consumption behaviors of tourists, multiple recreational values of the county were also inferred: the aesthetic experience presented the greatest contribution, while educational knowledge accounted for a lower percentage. (3) The recreational and cultural ecosystem services value 294.16, 60.03, and 143.26 million USD for Xiaochangshan, Dachangshan, and Guanglu Islands, respectively. Based on the findings of this study, future research will focus on the planning and development of Xiaochangshan Island tourism to maximize consumer surplus.

A Study on Sustainable Development of Island Economy Based on Ecological Footprint Approach - A Case Study of Changhai County, Liaoning Province

The ecological footprint method, as one of the methods to evaluate sustainable development, has been widely used at home and abroad. This paper adopts the ecological footprint analysis method, introduces the ecological footprint model and ecological carrying capacity model, accounts for the data based on 2015-2019 statistics, quantitatively calculates the data of the economic development of the island, and explores the economic, social and ecological sustainable development of Changhai County, so as to provide reference for other island economic development models.

Evolution and reconstruction of settlement space in tourist islands: a case study of Dachangshan Island, Changhai County

Evolution and reconstruction of settlement space in tourist islands: a case study of Dachangshan Island, Changhai County

The Price Difference and Trend Analysis of Yesso Scallop (Patinopecten yessoensis) in Changhai County, China

This paper focuses on the difference in inter-group and intra-group price of Yesso scallop (Patinopecten yessoensis) and the simulation accuracy of three different exponential smoothing models in the price. Based on the farm-gate price and wholesale price data of P. yessoensis in Changhai county from January 2017 to December 2018, this study uses the Wilcoxon rank sum test to compare the inter- and intra-group price and applies simple exponential smoothing (SES), Holt’s linear trend method, and Holt-Winters’ additive method to simulate and predict the price. The results suggest that (i) to improve economic benefits, it is necessary to formulate reasonable farming area and establish low-density ecological cultivation mode; (ii) the price’s Akaike information criterion (AIC) and mean absolute percentage error (MAPE) values by the SES model are optimal, and the MAPE value is lower than 4%; and (iii) the result of SES analysis shows no obvious change from January to March 2019.

Spatiotemporal Evolution Characteristics of Ecosystem Service Values Based on NDVI Changes in Island Cities

Vegetation plays a dominant role in and serves as the structural foundation of island-land ecosystems. Island cities, as sea-land ecological complexes, are able to somewhat reflect the general realities of island ecological environments. By using the Landsat series remote-sensing images and an ecosystem service value (ESV) evaluation system, in this paper, the temporal and spatial evolution characteristics of the NDVIs and ESVs of China’s 12 island counties over the past three decades are analyzed. According to the research results, (1) The average NDVI of China’s island counties dropped from 0.380 to 0.347 in 1990-2018, reflecting a continuous downtrend. The NDVIs of Changhai County and Changdao County show significant changes, with decreases of 45.24% and 37.57%, respectively. (2) The total ESV of China’s island counties showed a “V”-shaped change trend from 1990-2018; the minimum value reached USD 362 million in 2010, then essentially recovered to the 2000 level in 2018. (3) The high and low values of NDVI and ESV in island counties over the years were distributed with the spatial characteristics of high values in the center of the islands and low values at the edges of the islands. The island counties north of the Yangtze River showed the largest changes in NDVI and ESV. (4) Forest cover is the main factor that drives ESV reduction in China’s island counties, followed by grassland cover. This study provides an effective method to study the changes in the NDVI and ESV of island cities and proposes the strengthening of island vegetation protection and the promotion of sustainable development in the ecological environments and economies of island cities.

Sea Surface-Visible Aquaculture Spatial-Temporal Distribution Remote Sensing: A Case Study in Liaoning Province, China from 2000 to 2018

Aquaculture plays an important role in providing food and reducing poverty but it affects environmental change and coastal ecosystems. Remote sensing is a technology that is helpful in the spatial-temporal dynamic monitoring of aquaculture, coastal management, and environmental monitoring. Most research focuses on inland and coastal areas, and little attention is paid to the extensive distribution of marine aquaculture. As an example, we use the freely available Landsat data of the developed marine aquaculture Liaoning Province of China and use the object-oriented automatic extraction method to analyze the spatial and temporal distribution information of marine aquaculture from 2000 to 2018. The accuracy evaluation from the randomly distributed sample points in high-resolution remote sensing images shows that the extraction accuracy for all of the five individual years of aquaculture area was higher than 82%. The results showed that (1) in the past 19 years, the area of marine aquaculture in Liaoning Province showed an increasing trend, which increased from 35.41 km2 in 2000 to 201.83 km2 in 2018, approximately 5.7 times increase in total area, but the growth rate decreased slightly due to government policy and the environmental quality of the sea area. (2) The centroid of offshore aquaculture in Liaoning Province shows a migration pattern to the northeast, in general, extending from the Dalian Bay sea area to the eastern sea area of the Dalian Chengshantou National Nature Reserve of Coastal Landform in the northeastern direction, and the migration distance reached 48.78 km. Moreover, the migration distance between 2005 and 2010 was the largest of all of the periods, reaching 35.43 km. The new marine aquaculture areas are mainly concentrated in the eastern direction of Xiaoyao Bay, the Changshan Islands, and Guanglu Island in Changhai County. (3) The landscape pattern of marine aquaculture in Liaoning Province is split, large-scale aquaculture and small-scale aquaculture are symbiotic, and landscape ecological activities are active. For local managers, this study can provide valuable supporting data for the assessment of marine aquaculture yield in this region, comprehensive control and management of the marine environment, and stability of the marine ecosystem. For other countries or regions, this work provides a great reference value for monitoring the dynamic spatial distribution of marine aquaculture.

Evaluation on deep-water cage culture suitability of Changhai County based on GIS

For the scientific planning of deep-water cage culture sea, this paper constructs a comprehensive suitability evaluation index system for deep-water cage culture, uses AHP to determine index weights, and calculates the Comprehensive weighted suitability index. Based on GIS the spatial statistics and analysis of the suitability results were carried out, and the Changhai sea area was taken as an example for case study. The results show that the suitable sea area for deep-water cage culture is 7045.81 km2, accounting for 65.31% of the total sea area of Changhai county. The most suitable sea area for deep-water cage culture is distributed around Guanglu and Gexian Island, the southern part of Zhangzi Island, the sea area between the Shicheng Island and Wumang Island and the southern part of the Haiyang island, with an area of 1248.38 km2, accounting for 11.57%. The higher suitability sea area is widely distributed around Zhangzi Island, Haiyang Island, Wumang Island and Xiaochangshan Island, covering an area of 2279.56km2, accounting for 21.13%. Due to the combined effects of chlorophyll concentration and distance from town areas, it is not suitable for deep-water cage culture area mainly distributed in sea areas far away from land and islands, with an area of 814.81 km2, accounting for 7.56%. The study can provide reference for the sea planning and sea area management of aquaculture in Changhai county.

Marine biodiversity evaluation based on the pressure-state-response (PSR) model of Changhai County, Liaoning Province

为了准确评价我国北方沿海地区生物多样性状况，研究社会经济发展对生物多样性的影响，我们选择辽宁省长海县开展研究。长海县是中国唯一的海岛边境县，也是我国北方著名的渔业县，捕捞、海水养殖为长海县的支柱产业，境内海洋生物资源丰富。我们收集和监测2004-2013年间长海县的社会经济、生态环境和环境保护等数据，以压力-状态-响应框架模型（PSR框架模型）为基础，筛选出19项指标组成长海县海洋生物多样性评价指标体系。运用层次分析法确定各指标的权重，并计算海洋生物多样性指数，结果发现：2004年海洋生物多样性指数为历年最大，达0．660，评价等级为良；2013年为历年最小，只有0．471，评价等级为中。2004--2007年的海洋生物多样性状况要好于2008-2013年。分析其中的压力、状态和响应指标的变化，发现构成压力指标的工业废水排放量、固定资产投资额、外来物种养殖产量、旅游人数和海上货运量等诸多指标的归一化值多年来均呈明显的下降趋势，说明生物多样性压力呈加大的趋势，对长海县的生物多样性状态存在潜在的影响。

Dietary Features and Blood Pressure among 18-88-Year-Old Residents in an Island Population in China.

Dietary recommendations to reduce blood pressure (BP) have been widely disseminated and residents who live on islands have unique dietary characteristics. Here, we identified associations between dietary intake and BP levels among island residents in China. Cross-sectional study. The Changhai islands, which is an important island county in China. A total of 876 residents, 18-88 years old, of Changhai county. Dietary intake and BP measurements were assessed using standardized questionnaires and protocols, respectively. Dietary intake was compared across BP categories and linear regression analyses were performed between dietary intake and systolic blood pressure (SBP) and diastolic blood pressure (DBP). Participants previously diagnosed with hypertension consumed less salt than those with undiagnosed high BP (p < 0.01). After exclusion of participants previously diagnosed with hypertension, salt and meat consumption were positively and linearly associated with both SBP (p < 0.01 and < 0.001, respectively) and DBP (p = 0.03 and < 0.01, respectively), whereas consumption of marine products was inversely associated with SBP (p = 0.047). Mixed edible oil and edible oil consumption were associated with SBP (p < 0.01) and DBP (p = 0.021), respectively. In the multiple linear regression model, meat intake was positively associated with both SBP and DBP (β = 0.139, p < 0.001; β = 0.066, p = 0.047, respectively), whereas consumption of marine products was inversely associated with SBP (β = -0.102, p <0.001), while mixed edible oil was associated with SBP (β = 0.062, p = 0.03). Adherence to nutritional recommendations can be improved among hypertensive patients, even those aware of their conditions. In the general island population, eating habits regarding salt, meat, edible oil consumption, and use of mixed edible oil increased the risk of hypertension onset, whereas marine products were found to decrease this risk.

The Hospital Costs of Stroke Patients in Chinese Island Populations: An 11-Year Tendency Analysis

The impact of stroke is devastating the life of patients, families, and even the communities. The cost of treatment; however, has the tendency of increasing nowadays, which has brought a heavy burden to patients and their families. Our study aims to collect the data of the hospital cost among stroke patients in Chinese island populations over the past decade and provide the scientific improvement for stroke. We retrospectively collected the basic information and hospital costs of the stroke patients in Dalian Changhai Hospital from 2003 to 2013 using the Information Registration System of Inpatient. The total cumulative hospital admissions for stroke in Dalian Changhai Hospital were 1367 and showed a rising tendency from 2003 to 2013. Our results illustrated that the annual cumulative hospital costs of stroke inpatients increased rapidly in the past 11 years (the average rise was 37.71% per year), and the mean hospital cost per admission was 1.66% higher than that before, when the mean length of hospital days showed a downward tendency. Medication cost was found to be the largest part in the overall hospital cost (as a high percentage of 73.94%); however, traditional Chinese medicine only occupied quite a small proportion in the medicines. The hospital cost for stroke in Dalian Changhai County has brought an increasingly heavy economic burden to the local government and residents.

GW25-e4329 The epidemiological investigation of hypertension in original residents of affiliated islands of Dalian Changhai County

To investigate the prevalence and risk factors of hypertension in affiliated islands of Dalian Changhai County. Adopting the cross-sectional study and taking the overall random sampling method, we selected the 2616 original inhabitants of Sea island, Guanglu island, Zhangzi island and its

基于物质流分析方法的生态海岛建设研究——以长海县为例

PDF HTML阅读 XML下载 导出引用 引用提醒 基于物质流分析方法的生态海岛建设研究——以长海县为例 DOI: 10.5846/stxb201304280869 作者: 作者单位: 青岛大学国际商学院,国家海洋局第一海洋研究所,青岛大学国际商学院,国家海洋环境监测中心 作者简介: 通讯作者: 中图分类号: 基金项目: 国家海洋908专项资助项目（908-ZC-II-01）；国家海洋公益性行业科研专项资助项目（200805082）；教育部人文社会科学研究资助项目（12YJCZH009） Evaluation of ecological marine islands construction based on material flow analysis：a case study of Changhai County Author: Affiliation: International Business College of Qingdao University,The First Institute of Oceanography,SOA,International Business College of Qingdao University,National Marine Environmental Monitoring Center,SOA Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:建设生态海岛是海岛生态经济系统实现可持续发展的重要途径。运用物质流分析方法对长海县的物质输入与输出状况进行计算，并用物质消耗强度、废物排放强度和环境负荷强度3个指标衡量了该海岛县生态效率的变化，分析了技术进步对海岛生态经济系统生态压力变化的贡献状况。结果表明，2003-2009年间，长海县物质输入总量、物质输出总量和环境负荷总量呈增长态势；生态效率明显提高；技术进步对减轻海岛生态经济系统生态压力的贡献没有抵消经济增长所产生的生态压力的增加量。为了减少物质输入和废物输出，减轻经济活动对海岛生态系统产生的压力，建立创新型管理机制有效促进技术进步，不断提高生态效率具有特别重要的作用。 Abstract:Material flow analysis (MFA) has widely been used in the field of sustainable development research, but it was hardly applied in the sustainability valuation of marine islands eco-economic system. Marine islands eco-economic system is a critical component of the large marine eco-economic system. The construction of ecological marine islands is an important approach to establish marine islands eco-economic system in the course of sustainable development. Taking four indices as measurement, namely the direct material input (DMI), total material requirement (TMR), domestic direct material output (DMO) and total direct material output (TMO), the material input and output of Changhai County during 2003-2009 has been analyzed in this paper based on material flow analysis (MFA). According to these four basic indices, material input intensity, waste emission intensity and environmental pressure intensity are calculated to analyze the County's ecological efficiency. The contribution of technological progress to reducing the ecological pressure of these marine islands is also considered through elasticity coefficient of ecological pressure and contribution rate of technological progress. The first result shows that material input quantity, waste emission quantity and environmental pressure quantity have increased rapidly during 2003-2009. The direct material input (DMI) presents rising tendency, up from 1.12 million ton in 2003 to 1.85 million ton in 2009, and the average annual growth rate is 8.8%; total material requirement (TMR) increases faster than DMI, with the average annual growth rate at about 9.7%. However, the growth rates of two indices of material output, namely domestic direct material output(DMO) and total direct material output(TMO), whose average annual growth rates are 12.60% and 12.53% respectively, reflect that waste emission growth are the fastest-growing indices. Fresh water is the largest input material in DMI, and the average annual proportion is about 34.67%. With more and more material imports during the seven years, the import material share of DMI rises from 12.09% in 2003 to 20.12% in 2009. Waste gas and waste water emission are main parts of DMO, whose average annual proportions of DMO are 54.77% and 42.64% respectively.The second result shows that ecological efficiency of the marine islands county has been greatly improved during the construction of ecological marine inlands since 2003. Material use intensity declines from 7.06 ton per ten thousand yuan in 2003 to 5.24 ton per ten thousand yuan in 2009, and the average annual decreasing rate is 4.85%. Average annual decreasing rates of waste emission intensity and environmental pressure intensity are 1.53% and 3.31% respectively, which are slower than that of material use intensity. This indicates that the sustainable development capability of the marine islands eco-economic system has been improving continuously. The third result shows that the contribution of technological progress to reduce ecological stress hardly neutralizes the increasing amount of ecological pressure caused by economic growth during the same period. The decrease amount of resources use resulting from material use intensity reduction only accounts for 38.65% of the increase amount of resources use caused by GDP growth. Contribution of waste emission intensity and environmental pressure intensity to relieving ecological stress are 12.16% and 26.35% respectively, both of which are less than that of material use intensity.In order to slow down material input,waste emission and relieve the pressure from economic activity on marine islands ecological system, it is essential to continue improving ecological efficiency through technological progress based on establishing innovative management mechanism. 参考文献 相似文献 引证文献

Spatiotemporal variations in suitable areas for Japanese scallop aquaculture in the Dalian coastal area from 2003 to 2012

Abstract The Japanese scallop ( Mizuhopecten yessoensis ) is an important commercial species in the Dalian coastal area. The present study employed a suitable aquaculture site-selection model (SASSM) and used satellite remote-sensing data to analyze the spatiotemporal distribution of suitable areas for Japanese scallop aquaculture in the Dalian coastal area from 2003 to 2012. The study area was divided into four marine zones. The results demonstrated that the suitability scores of scallop aquaculture areas were high in May and low in February. The Changhai County (Zone II) and Lushunkou areas (Zone III) exhibited high potential for Japanese scallop aquaculture development. The results of the suitability models were consistent with the existing scallop aquaculture in the study area. These zones, combined with climatic events [the winter East Asian Monsoon (EAM) and El Nino/La Nina–Southern Oscillation (ENSO) events], were used to examine the impact of climate variability on scallop aquaculture. Results suggest that the suitability scores in Zone III were more sensitive to changes in environmental factors ( e.g. , sea surface temperature, chlorophyll-a, and suspended sediment) and climate changes, whereas the correlations among these factors were not significant in Zone II. Adaptation to these changes should be considered when developing plans and management strategies for scallop aquaculture.

Analysis on Stability of the Short-Pylon Cable-Stayed Bridge

This thesis took the Changshan Bridge in Dalian Changhai county as an example and adopted the general finite element software ANSYS to simulate it. Analyzed the stability of the completed bridge and the single free-standing tower state, and studied the buckling of the main girder and the thin-walled pier.