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With the development of the economy and rapid population growth, the range of contaminated groundwater is getting bigger and bigger. Groundwater pollution has a slow process, and it is not easy to find and difficult to control. Once polluted, it takes more than ten years, sometimes even decades to recover. Groundwater pollution has a close relationship with people's health. This paper mainly discusses...
Land use/land cover change (LUCC) as an important part of global environmental change has always been one of the hottest issues of ecology research. Based on RS and GIS methods, land use information for 1990 and 2008 was acquired from TM images and analyzed in Yanqing County, Beijing, China. This paper analyzes spatial-temporal land use change in two basins covering the study period. The results showed...
Water environmental problems of river basins in china are becoming more and more serious. Whereas, the environmental watchdogs at different levels provide comparatively independent water environmental data and use various kinds of data patterns, which makes it difficult to resolve the problems in a comprehensive way and make a unanimous decision as to how to deal with the worsening water environment...
Flood disaster is one of the major natural disasters, the frequency and destructive power of it ranks one of the top disasters in China. In the flood risk assessment, the distribution of drainage network is a very important assessment factor. This study extract the watershed features of Pearl River Basin and Luan River Basin based on the Digital Elevation Model (DEM) and GIS-supported geospatial data...
Principal component analysis (PCA) were applied to assess surface water quality of the Songhuajiang River basin, China. Thirteen physical-chemical parameters in 25 stations were collected monthly during the period of 2008. Three factors were extracted by PCA, which explained 83.79% of the total variance. The first factor (PCA1) was positive correlated with permanganate index, BOD5, NH3-N, CODCr, TN,...
In this article, precipitation and subtropical high ridge axis of 500hPa are adapted for the new definition of North Huaihe-River Rainy Season (NHRS). The annual precipitation in NHRS and Meiyu (YHMY) from 1961 to 2009 is calculated by the summer daily rainfall in East China. The beginning day and ending day, as well as duration time in 49 years are also analyzed in this article for the two Rainy...
Hydrologic model setup is an important process in the whole model simulation. This study introduces an approach for hydrological simulation analysis based on extracting watershed features from DEM using Arc Hydro Tools. This method consists of two steps: firstly, extracting watershed features from DEM using Arc Hydro Tools. Then, process hydrological simulation analysis with hydrologic model HSPF...
This paper has conducted the national-scale assessment of flood disaster risk in China based on the theory of natural disaster risks and by means of the powerful spatial analytic tool of GIS, as well as the normalization and analytic hierarchy process. The precipitation of the current day and last three days, topographic elevation, topographic standard deviation, network of rivers and lakes, population...
In the Yanqing area, Beijing, China agriculture water use and soil erosion are significantly serious due to large-scale agricultural irrigation; It has been the most prominent issue of agricultural irrigation for water resources protection, mainly because irrigation water use utilization efficiency is very low. The key issue of water-saving agriculture is to improve the utilization of irrigation....
Based on harnessing the Yellow River, a multi-nozzles pile extractor was developed. Multi-nozzles submerged jets of extracting pile component were simulated numerically by the RAN k-ε model and the Ansys software. The reasonable structure was attended and tested by experiment. The simulated numerically results showed that the simulated numerically method was an effective way which was used to study...
Extracting watershed features from DEM (Digital Elevation Model) is a very important task in Hydrologic study, and also it is the pre-process of hydrological simulation analysis. This paper introduces a very useful method for Hydrological simulation analysis based on extracting watershed features from DEM using Arc Hydro Tools. Arc Hydro is a geospatial data model especially GIS for Water Resources,...
Grey system theory is widely used in various environmental quality assessments for the grey characteristic of environmental system. In this paper, according to grey theory, a grey correlative model which is variable weights and based on water chemistry and productivity indicators is constructed to evaluate the marine environmental quality of Shenzhen Bay. The results show that the sea water quality...
The Princeton Ocean Model (POM) is a three-dimensional baroclinic ocean model based on the original equations, using a sigma coordinate in the vertical coordinate to deal with significant topographical variability, and has been widely used for estuary and coastal ocean simulation. Wetting and drying is a common and important phenomenon of the coastal ocean, and the process could not be simulated by...
The Coastal wetlands are important ecosystems between land and sea ecosystems. However, people develop wetlands so excess that decrease their areas and quantities. The coastal wetland has become a more frangibal ecosystem. Now the coastal wetlands of China are confronting serious threaten of wetland loss and eco-environmental deterioration. The research approach of the paper is an analysis of the...
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