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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...
The study on groundwater vulnerability is an effective technical measure for rational development and protection of groundwater resource. In the paper, according to the hydrogeology conditions of the Lincang Basin in Yunnan Province, USEPA's DRASTIC method was applied to evaluate the groundwater vulnerability of this area with the consideration of depth to the water table, Net recharge, aquifer material,...
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...
This study was undertaken in Danjiangkou reservoir and the upper reaches, where the SWAT model was used to analyze the space distribution of non-point source pollution. The land-use pattern was interpreted by Environment for Visualizing Images Software (ENVI). The runoff and the sediment data series from 2001 to 2006 were collected to calibrate the parameters and validate the model. The calculated...
In recent years, the runoff of Haihe River basin has decreased significantly, especially after 1980s, due to climate change and human activities. So in this paper, a variable fuzzy method was adopted to research the variation characteristics of rainfall and runoff, and infer the main driving factors for runoff reduction. According to the parameter of the theorem and its relationship with zero, the...
The paper presents the principle and calculation process of the principal component analysis which is a useful method of water quality assessment. Eight indicators include dissolved oxygen, permanganate index, BOD, ammonia nitrogen, copper, zinc, volatile phenol, oil in 20 monitoring sections of Ningbo urban river were analyzed by using principal component analysis. Three factors with 86.67% of accumulated...
Groundwater is the source of main agricultural, industrial and domestic water in the Alluvial Plain of Hutu River, the pollution degree of groundwater directly affects habitants state of health in the area. In order to explain the condition of shallow groundwater organic pollution under the influence of human activities, the Alluvial Plain of Hutuo River was selected as the main study area, and then...
Traditional field sampling methods are expensive and inadequate to resolve continuous sediment dynamics in complex lake, due mainly to the complex interactions among optically active substances. To address this problem, MODIS images were used to map total suspended solid (TSS)concentration, a linear regression model was developed between bands combination (band3-band1) MODIS Terra500m data and in...
As the main portion of urban catchment, road is also a major non-point pollution source of receiving water body. The road runoff pollution has attracted wide attention. The paper makes a study on six rainfall road runoff from 3 different types of roads, analyses the status of road runoff pollution, the surface runoff pollution load and correlation between road runoff pollutants. The result shows that...
Fuzzy mathematics method is used to evaluate the groundwater quality in Yang village. The groundwater quality of 18 villages belongs to V level water (GB/T14848-9 Quality standard for ground water) in the study area, where water pollution is very serious. Polluted area mainly includes the sandy soil region in northeast Yang village and east bank villages in western Beijing-Hangzhou Canal. Yinma village...
Based on the analysis of Hydro-geochemical and environment isotope characteristics of Bangnazhang-huangcao dam hot spring in Yun nan province, the author think that the hot springs has the same regularity in the region, the hot springs are completely different from cold springs and surface water. At the same time, the Hydro-geochemical and environment isotope characteristics are different shows that...
In view of the characters of hydrologic and meteorological situation in the cold mountain areas, the paper dispersed the watershed into the minimum grids. Through analysis on the different effect of solar shortwave radiation flux on ground surfaces at the same elevation grid, the redistribution of surface cold and heat source due to topography variation and snowmelt runoff were studied. Then, topography...
Wuhan city is the core city of Wuhan city circle and the major city of the Yangtze River, and the change of water have attracted great attention. Using the techniques of "3S" and landscape ecology, based on 1991 and 2009 Landast TM remote sensing image, integrating with the change of water modeling, transform matrix, the shift of gravity centers and landscape pattern analysis software Fragstats3...
Extracting digital drainage network and physical descriptions of watershed based on DEM is the precondition of research on building distributed hydrological model and hydrological simulation. There're some traditional methods to extract digital drainage network based on DEM. Aiming at the deficiencies of those methods, many scholar provide improved methods such as extending virtual river network information...
Lake water is an essential renewable resource for mankind and the environment and it is important for civil drink water supply. Shitoukoumen reservoir, one of the most important drink water supplies, is taken as examples to assess the water quality by multi-temporal Landsat TM/ETM data. The multiple scattering model within the water is applied to simulate the radiative transfer for retrieval of the...
The drought is the most common natural disaster in the world, and the soil moisture content is one of the main indicators of drought monitoring. This study took the semi-arid region in northern Henan province as the study area and used Landsat-TM of 2008 remote image to set up the empirical model for getting the reflectance of the earth surface. The influence of vegetation on the pixel reflectance...
Considering uneven distribution of watershed land surface in space is an important characteristic feature of distributed hydrological model. The development of remote sensing, in particular the digital technology, provides technical support for solving the problem of uneven distribution of rainfall and watershed land surface in space. The information of vegetation, land use, soil and geology can be...
Water and soil erosion is one of the most serious global environment. In Yulin Distract this phenomenon is very serious. Based on DEM and other data, using RS and GIS technique, based on general soil erosion equation RULSE model, The study has calculated the quantity of invaded soil in different years, completed the spatial distribution picture of the invaded soil, carried on the dynamic research...
The geo-statistical method was used for predicting the distribution of the content of Chrome (Cr) and tracing the hotspots in water-level-fluctuating zone. The hotspots of Cr pollution which indicated higher risk than other areas were identified to be mainly distributed in the water-level-fluctuating zone of soils near populated areas along the Xiao River. The mean contents of Cr in soils are more...
In order to evaluate water resources capacity, a new assessment model based on cloud theory is proposed. Considering the fuzzy and stochastic feature in assessment, the new model can realize greatly the conversion from qualitative conception to quantitative model. Take the new model into evaluation of water resources carrying capacity. Evaluation model based on cloud theory can not only show the fuzzy...
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