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Hydrologic changes caused by diversion hydropower are poorly described. Herein, we evaluate hydrologic alteration in 32 ungauged rivers developed for diversion hydropower. We simulated long‐term unregulated discharge records before perturbing flows with the hydropower diversion and comparing periods with and without diversion. We detected statistically significant changes to flow regime metrics across...
The spatial pattern of economic zones is changing ceaselessly during the process of its natural, historical and objective evolution. In China, the scientific division and function of economic zones in the new period expedite the regional harmonious development and the building of a well-off society. With the support of geographical information technology, 16 regional central cities and 21 sub-central...
Due to fast urbanization, natural ecosystems are increasingly being replaced by urban development. Human health is also being threatened. Shanghai has been experiencing a rapid urbanization for over two decades. It is challenging to protect the unique natural ecosystem for planners and decision makers because of the complex ecosystems and other factors. This paperpresentsan integrated method for planning...
In order to make a quantitative analysis on spatial pattern of headquarters about top 500 enterprises of Chinese service industries, the software of ArcGIS 9.2 was adopted. The results showed that the headquarters were mainly distributed in the eastern coast region of China. The value of global Moran's I was about 0.11. High value regions were all distributed in the eastern coast region of China and...
Landsat TM images of the Pearl River Delta taken in 1988, 1998 and 2006 are used to explore the Construction land Expansion and the Influence of Site Factors. The expansion shows the characteristics of gathering on plains and along major roads and coastlines in both periods from 1988 to 1998 and from 1998 to 2006. Several site factors, including landscape types and the distance from roads, coastlines,...
Geographers, demographers and other scholars have a sustaining interest in China's population distribution. The research is based on China's GIS data sets of population census in 1953, 1964, 1982, 1990 and 2000. The first part of this study is to analyze the population density patterns by various spatial analysis methods and explain possible influencing factors. The second part analyzes population...
In the renovation of the old cities in contemporary china, the way of building first has been generally adopted for a long time. Land function transformation is made as a top priority in urban renewal for land value increment and tax. In this way, what is gained in economic interests temporarily is lost in the historical value and feature of old city. The paper presents a strategy of considering first...
China is a beautiful country with hundreds of thousands of mountains spreading over the country. Climate change poses a potentially major challenge to social and economic development in China mountain areas. Development is successful if it reduces the vulnerability of mountain areas and poor people to existing climate variability, while also building in the potential to anticipate and react to further...
we selected the northern slope of Qilian Mountain as typical study area, so as to detailed study the influence of forest on runoff. Firstly, we divided the study area into different basin-based units( a total of 20 basins from southeast to northwest), then we classified all basins into 7 groups though clustering analysis based on basin features, meteorological and hydrological features data, forest...
China's Low Elevation Coastal Zone (LECZ) is prone to flood, where the population exposure, death risk and economic loss risk are very high. We apply an ArcGIS environment to combine the gridded data of the world population (GPW) and flood disaster risk data from Hotspots and Chinese administrative division to analyze the spatial distributions of flood occurrence frequency, death risk, economic loss...
The purpose of this paper is to find the variation of pollutant concentration field and its impact on water intake of the Fen River entrance into Yellow River. A 2-D water hydrodynamic and quality model was used to simulate flow and variation of the pollutant concentration field. There will be a backwater in tributaries when the water in Yellow River flow into Fen River. The COD concentration decreased...
In the paper, some relative research theory and calculation methods for the river ecological basic flow both at home and abroad have been summed up, and then, considering the actual conditions of Sushui River, the function of the river reach is determined. The ecological basic flow of the river in different periods has been quantitatively researched with Tennant and the minimum monthly average flow...
In recent years, researchers pay increasingly attention on river ecological restoration at home and abroad. According to the practical situation of Tianjin Airport Economic Park river water environment and inter-external experiences, several ecological techniques, such as phytoremediation, artificial aeration and ecological riverbank, were adopted to river ecological restoration. And related operation...
Based on the cause of sediment transporting equilibrium degree theory and the 20 years date of water and sediment of the Yellow River downstream, the equation of water and sediment item relational sediment transport equilibrium degree of six sections of the Yellow River downstream were established. Used the fuzzy cluster analysis theory, the method of forecast and control of river pattern of the Yellow...
There exist the interaction between lake and ambient rivers. This study focuses on the total and bioavailable concentrations of trace elements in river sediments around the northern Taihu Lake. We can recognize the characteristics of trace elements in different sites by comparing the west, north and the east rivers and evaluate the contamination level of sediment. The concentrations of TP and TN in...
The saturated silt ground in this area which was exerted by seismic loads was simulated numerically by using FLAC-3D. Liquefaction in surface of powder foundation occurred less likely and with the increasing depth of foundation it occurred more likely. The density of soil in upper layer increased because of the role of dynamic compaction. And as density increased, the dynamic strength of soil in this...
The article analyses and predicts the hydrodynamic feature of study area on the basis of mike21 numerical model. It is by the two dimensions pollution diffused simulation method based on the hydrodynamic model. And then it predicts the contributed concentration field of the waste water. Based on the NH3-N in discharge of sewage, it contrasts the impact on water quality in the Yangtze River of the...
Currently, urbanization has entered a stage of rapid growth in China, the environmental pollution and ecological destroy of cities are becoming more and more serious day by day. The work field of city planning and design is beginning to expand to undertake a task to improve living and ecological environment due to paying more attention to afforesting and ecological construction. Under the new background...
The paper discusses the relationship of the forest cover rate and the quantity of surface flow of two typical basins in LuZhong mountain area in more than forty years. The result shows that : the increase of the forest cover rate, helps to the supply of precipitation to the ground water, and helps to slow down the drainage speed of the precipitation, reduce the flood peak flow in flood season in mountain...
This study using computer image processing and artificial neural network sensor technologies constructs a method of identifying ice slurry density based on the value of ice color image. The method is applied to the Jinan section of the Yellow River through the ice image acquisition, R/G color extraction, network learning and training, the final output target value of ice or water, and the actual image...
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