Concept Of Sponge City Research Articles

Design and evaluation of high–luminance porous asphalt mixtures based on wasted glass for sponge city

In this paper, based on the concept of water glass recovery and sponge city, the waste glass was applied as part of aggregate to prepare a kind of porous glasphalt mixtures. The glass cullet was crushed to a certain size as glass aggregates to partially replace the mineral aggregates. The performances of glasphalt mixtures were tested and evaluated. In the experiment, four groups are designed, which are ordinary asphalt mixtures, cement-modified asphalt mixtures, glasphalt mixtures with no surface-treated glass, and glasphalt mixtures with surface-treated glass. Through the tests of road performance, the No. 4 group of glasphalt mixtures with 84% mineral aggregate + 1% Portland cement + 15% glass aggregates treated by Fe2O3 suspension has good technical properties in high temperature stability, low temperature stability, and water stability, although slightly poorer than that of asphalt mixtures. As the glasphalt mixtures are for the porous asphalt pavement, the volume of connected air voids and permeability coefficient was calculated. In addition, the method of MATLAB grayscale image processing is used to evaluate the reflective property of glasphalt mixtures, and it is found that the application of glass can significantly improve the surface luminance. This environmentally friendly glasphalt mixtures not only solve the problem of environmental pollution caused by waste glass but also saves the cost of pavement materials, improves the road traffic environment visibility. Therefore, the new type of glass asphalt pavement has good economic and social benefits, and it is worth to be promoted.

Study on the Application of Expressway Construction Based on Sponge City Concept

<p>Currently, in the active trial stage, sponge city concept has been applied in many low-impact development facilities on expressways in China, but many applications are not widely used. From four angles of pavement, slope, interchange and service area of expressway, this paper explains the adverse effects brought by rainwater, and then gives, and it carries out scene analysis combined with actual engineering projects with some feasible application schemes. Finally, the concept of sponge city at present is summarized, and it is considered that the optimal planning and design can be made only after establishing a reliable mathematical model and carrying out quantitative analysis.</p>

Research on Rainwater Management from the Perspective of Sponge City

In recent years, “Watching the sea in the city” has become a portrayal of most cities in China. In order to solve the problem of urban shackles and exploring rainwater management, China advocates the construction of sponge cities. This paper discusses the concept and connotation of sponge city and low impact development, and introduces foreign sponges. According to the actual situation of China, the suggestions and countermeasures for building sponge cities in China are put forward in order to provide reference for rainwater management in China.

Research on Residential Quarters Based on the Concept of Sponge City

In order to solve the increasingly serious water environment problem in China, the concept of Sponge City is gradually being applied to urban construction. As one of the carriers of the sponge city, the Sponge Community area has an important impact on the urban stormwater management work and plays a key role in urban construction. Compared with the traditional community, the Sponge Community can effectively collect and allocate rainwater, establish an effective relationship between the hard building landscape and the natural environment, and effectively improve the ecological climate and ecological environment of the community. In this paper, through the combination of literature collection research, empirical analysis and theoretical analysis, based on the existing research in China, combined with the relevant theories of Sponge City, comprehensive analysis of the constituent elements of Sponge City, such as vertical greening and rain garden, The specific measures most suitable for the Sponge Community are summarized as follows: concave green space, permeable pavement and other technical measures. At the same time, through the combination of practice and theory, the unique Sponge City Water circulation mechanism is summarized. Finally, through the analysis of the current situation of the Sponge Community and the current development of the sv, the problems and solutions encountered in the middle and late stages of the Sponge Community design are expounded, in order to draw some inspirations for the development of the Sponge Community.

The Reference of Singapore ABC Water Plan to China's Sponge City: A Case Study of Singapore Interlaced Building

In order to solve the increasingly serious water environment problems in Chinese cities, the concept of sponge city in China is being gradually applied in the process of urban construction, and needs to be optimized in practice. ABC water project in Singapore integrates three elements (water gathering elements, water treatment elements, transportation and water storage elements) into the source, path and direction of rain flood management in line with the water management strategy in the overall storm flood management. The site development of ABC water project includes urban surface environment such as circulation facilities, structures, vegetation, waterways, water bodies and other water collecting elements. Water treatment elements and water collecting elements complement each other and can be used to slow down, hold up and purify the initial rainwater. Water transport and storage elements mainly refer to water facilities such as waterways and water bodies, covering Singapore rainwater management network. Due to the different urban planning parameters and space configuration, each site will have different planning strategies. This paper takes the Singapore intersecting building as an example to study the coordination and reference role of ABC water plan in sponge city, and thus provides some enlightenment for the construction of China's sponge city.

Simulation of sponge city landscape pattern optimization based on the storm water management model (SWMM).

With the rapid urbanization and increasing urban impervious areas in China, urban water-logging has become increasingly serious. The concept of sponge city was proposed based on the low impact development (LID) idea. We analyzed the impacts of landscape pattern optimization scenario on urban surface runoff and rainwater control ability in central urban area of Shen-Fu New Town in Liaoning Province. The storm intensity formula was used to construct rainfall process in different return periods. The landscape patterns of the study area were optimized based on sponge city concept. The storm water management model (SWMM) was used to simulate the differences of surface runoff and rainwater regulation ability under the pre-planning scenario and the landscape pattern optimization scenario. The results showed that total runoff and runoff coefficient of the study area were increased with increasing rainfall return period. In the same rainfall return period, the runoff coefficient was significantly reduced. The reduction of total runoff gradually increased, being 2.94, 3.58, 3.72, and 4.19 mm during the 1-year, 3-year, 5-year and 50-year return period under landscape pattern optimization scenario. The corresponding reduction rate was gradually reduced, being 23.9%, 16.4%, 14.3%, and 9.3%, respectively. Landscape pattern optimization scenario could meet the requirements that the rainfall was controlled at 20.8 mm when the rainfall return period p=1 year, the rainwater pipe network would not overload when p=3 years, and the river channel would not overflow when p=50 years.

Initial evaluation methodology and case studies for life cycle impact of permeability of permeable pavements

Abstract In recent years, urban flooding has occurred frequently in different cities in China. This has caused huge economic and environmental damages. As one of the main elements in the concept of sponge city – a potential solution to this problem – permeable pavements have attracted great attentions. This new technology has the ability to mitigate urban flooding effectively and it also provides other environmental benefits. Life Cycle Assessment (LCA) is a newly developed evaluation approach that can be applied to estimate the environmental impacts of pervious pavements in the entire life cycle. This study propose a basic model which can be applied to both permeable asphalt pavements and permeable concrete pavements to evaluate their environmental impacts. The impacts of this technology are investigated on urban flooding, water recycling and water purification. Then a comparison between permeable asphalt pavement and dense-graded asphalt pavement is conducted for a typical four-lane secondary road. Results indicate that in 10 km of the modeled road, 49TJ of energy consumption, 6700 t of equivalent carbon dioxide emissions, 0.1 t of lead emissions and 1 t of zinc emissions can be avoided if the permeable pavements is used. Moreover, the most significant reduction in energy consumption, GHG emissions, lead emissions and zinc emissions occurs in the use phase.

Water Circulation Construction exploration of Sponge City in Weidong-new-city

The sponge city has been transformed from theory into a rainwater harvesting and utilization project being implemented in many cities in our country. Rainfall control and utilization are no longer on the bargain but as an important strategy for the state to guide urban construction. In order to achieve the purpose of controlling rainwater resources and the utilization of rainwater resources, combining rainwater treatment with landscape design is the most direct and effective method. At the same time, the urban water also includes the urban landscape water. If the landscape can solve the problem of rainwater control and rainwater utilization by its own advantages, it not only makes full use of the rainwater resources but also saves the urban water resources. Based on the experience of foreign countries and the reference of the case, we also need to carry out a systematic study of its specific contents. The purpose of this paper is to systematically study the concept of sponge city under the premise of low impact on the development concept, The type of urban greenland related to landscape is analyzed in depth, the role of different types of sponge facilities in stormwater management is summarized, and the concept, construction and related issues of sponge city are briefly analyzed.

Influence of soil variability on single and competitive interaction of ammonium and potassium: experimental study on seven different soils

Ammonium and potassium are nutrients that generally co-exist together in soils in municipal wasteland. The main objective of this study is to investigate the interactive effects of NH4+ and K+ on their sorption characteristics in seven different soils. The adsorption parameters (Freundlich partition coefficient KF and maximum contaminant adsorbed by solid Qm) of both the isotherms for single and competitive interactions were correlated with soil-specific parameters (total specific surface area (SSA) and cation exchange capacity (CEC)). To depict the significant variation of the ions in the presence of other ions, percentage reduction of the isotherm parameters was calculated. Both the ions exhibited a competitive mode of inhibition in the presence of one another. However, the effects varied with soils and the range of concentration. The study demonstrated that at lower concentration, the NH4+ and K+ ion competed equally in all the soils. However, after a certain range of concentration unique for each soil, NH4+ retention was found to be marginally higher than K+. The study also signified some analogous values of the Freundlich and Langmuir isotherm parameters for soils like F Bent and Kao, which contradicted other experimental findings. This study can be useful for predicting fate of potassium and ammonium for risk assessment of contaminated sites and hence, in design or analysis of certain waste contaminant barrier under concept of sponge city.

Understanding the retention and fate prediction of copper ions in single and competitive system in two soils: An experimental and numerical investigation

The concept of sponge city has become very popular with major thrust on design of waste containment systems such as biofilter and green roofs. Factors that may influence pollutant ions retention in these systems will be soil type and also their interactions. The study investigated single and competitive interaction of copper in two soils and its influence on the fate prediction. Freundlich and Langmuir nonlinear isotherms were selected to quantify the retention results. Series of numerical simulations were conducted to model 1 D advection-dispersion transport for the two soils and analyse the role of isotherms. The results indicated that contaminant fate prediction of copper-soil interaction based on the two non-linear isotherms was different for both single and that in competition. Retardation factor obtained from Freundlich (RF) isotherm predicts more than Langmuir (RLa). This observation is more explicit at the higher range of equilibrium concentration. Fate prediction based on retardation value obtained from retention isotherms exhibited some anomalous trends contradicting the experimental findings due to inherent assumptions in governing equations. The necessity to have an approximate assessment of contaminant concentration in the field to effectively use contaminant retention results for accurate fate prediction is highlighted here. The study is important for modellers in design or analysis of biolfilter system (sponge city), where multiple ions tend to exist in waste water.

Investigation of fly ash for sorption of copper ions in multiple contaminant system: An implication on re-use of waste material under concept of sponge city

Many previous studies of soil contaminant treatment have primarily analysed heavy metal contaminant ion retention in fly ash (FA) in a single isolated medium whereas, factoring out the competitive systems. This study seeks to determine the interaction of the heavy metal copper ion (Cu+2) with fly ash under single and competitive systems and also to expound its impact on fate prediction. Freundlich and Langmuir non-linear isotherms were adopted to quantify the sorption results. The retardation factor attained from Freundlich isotherm predicts more than Langmuir. The Langmuir isotherm break-through-curves (BTC) was slightly earlier in break through, with a sharp front and prolonged tailing, whereas the Freundlich isotherm appears considerably after the production of a spreading pollutant front. Freundlich retardation factors established in this study was employed to one-dimensional (1-D) solute transport model, which successfully stimulated good prediction for sorption by fly ash. Conversely, significant inconsistencies were identified from the Langmuir isotherm for evaluating the fate of Cu+2 at high concentration range. This study recommends Freundlich isotherm for modelling transport of copper ions in a competitive environment in fly ash.

Exploring Potential of Fly Ash–Bentonite Mix as a Liner Material in Waste Containment Systems Under Concept of Sponge City

Abstract Many studies have been conducted to evaluate fly ash as an additive for the modification of hydraulic properties of soil. However, rarely are studies carried out that quantify physiochemical, strength, and hydraulic properties of fly ash–bentonite mix. Fly ash–bentonite mix may have the potential to be used as a landfill liner material instead of conventional sand in sand-bentonite landfills. Also, with the introduction of the new concept of sponge city, one of the aims of which is to minimize contamination and maximize the use of waste material, the exploration of fly ash–bentonite mix as a cover material in retention systems is highly crucial. The main objective of this study is to explore physicochemical, strength, and hydraulic properties as well as sorption characteristics of fly ash–bentonite mix. The sorption characteristics of the fly ash–bentonite mix for two heavy metals, lead ions (Pb+2) and nickel ions (Ni+2), were investigated. A criterion based on cation exchange capacity (CEC) and specific surface area (SSA) has been proposed. The study also developed correlations for estimating the CEC of soils with SSA and other soil parameters. Hydraulic conductivity decreases approximately four orders of magnitude with an increase in 30 % of bentonite. Unconfined compressive strength (UCS) is found to increase first (up to 40 % fly ash) and then reduces with further increase in fly ash. Furthermore, the curing time is also found to affect UCS significantly. The findings stated that the mix of 70 % or lower fly ash content (in fly ash–bentonite mix) is able to meet standard requirements for hydraulic conductivity and UCS. The Langmuir isotherm is found to better represent sorption behavior of fly ash–expansive soil, with nickel and lead as model contaminants. All the mixes considered in this study exhibited maximum uptake of Pb+2. Sorption decreases very mildly for mixes that have some expansive soil content, whereas it reduces drastically for only fly ash content.

The Reconstruction of Guilin's Urban Ecological Landscape Based on the Concept of Sponge City

Guilin is an international tourist city famous for its landscape, but the prominent contradiction in water usage becomes one of the key factors that influences and restricts the construction and development of the city. As an effective measure to relieve the contradiction of urban water usage, the concept of “sponge city” has achieved success in many places. Thus, building Guilin urban ecological landscape on the basis of the concept of “sponge city” is of great significance for the effective relief of the contradiction in water usage and the realization of sustainable development. Academic studies point out that for the purpose of the construction of sponge city, the construction of Guilin's urban ecological landscape first need to adopt sponge strategies in urban residential areas, transform or build a virtuous circulating green space system to collect, purify and store rainwater in an effective way. Secondly, build rainwater collection, purification, storage facilities or systems extensively and replenish urban ecological water reserve in the grey system of the city, according to the concept of “sponge”. Thirdly, considering the large area of Guilin city parks, build rainwater self-use rain systems extensively in city parks based on the concept of sponge and substantially reduce external ecological water reserve. Fourthly, reinforce training and learning related to the concept of “sponge city” and the implementation of “sponge city” policies.

Preliminary discussion on “Internet +” sponge city modular construction system

To promote the construction of ecological civilization and the process of urbanization in China, in 2013, the government propose to build an innovative rainwater system, which is characterized by nature accumulation, natural penetration and natural purification——low impact development of rainwater. This article Summarizes the research status of sponge city. It can be help the sponge city to become intelli-gent and modular creatively by adding the intelligent concept of “internet+” and the modular concept into the sponge city. This article first introduces the “internet+” concept of sponge city, and then discussed the application of the “internet+” and modular concept in sponge city from the three stage of construction, management and performance evaluation, in order to provide some reference and revelation for the development of modular of “internet+” sponge city.

Summary of Sponge Road Research

In recent years, the problem of city waterlogging is increasing with the constant expansion of the scale of urban construction and the speed of urbanization continues to accelerate, the construction of the sponge city has received great attention in the world. There are more and more domestic and abroad research on permeable pavement, but it still lacks a wide range of practical applications. This requires us to strengthen the construction of the sponge city and the study of a new sponge road, so as to reduce the loss caused by urban flooding. This paper analyzes the domestic and abroad research and application on porous pavement, and puts forward the sponge road under the concept of sponge city should combine with new type permeable pavement, design a reasonable drainage structure.

Optimization Design of Urban Road Based on the Concept of Sponge City

Based on the concept of accord with nature, natural accumulation, natural infiltration, natural purification, the design of urban road was optimized mainly from permeable pavement, subgrade, bio-retention facilities, and vegetation guardrail by Low Impact Development (LID). Optimization design of urban road based on the concept of sponge city can alleviate the problems of Chinese urban water resources shortage, frequent occurrence of waterlogging, water ecological deterioration, and urban heat island effect. And it has great significance and role to improve the urban living environment and promote the healthy development of the town.

Discussion and views on some issues of the sponage city construction in China

Sponge city has become one of the hottest topics in many industries and technology fields recently, while the current construction of sponge city in China is facing a lot of controversies with different understanding on the connotation of sponge city, as well as its construction objectives, content and practical results. Considering the water problems in the process of urbanization in China, combined with the authors' research and survey experiences, this article analyzed the concept of sponge city from the perspective of urban hydrology process. Then, a discussion was made on several issues, including construction objectives and indicators of sponge city, function development, underground rainstorm storage system and construction & management institution. Finally, a summary of the related discussions was given. Key points of this paper are that sponge city is a reshape of the urban water system and the urban living environment. Integrated functions will be a presupposition of the success in sponge city construction. Urban water system including rivers and lakes are supposed to be cores in the construction of sponge city and an overall program on the basin and city scale is especially needed. The sponge city construction must base on the advantages from multi-sectoral and cross-sectoral collaborations and need to be designed systematically.