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Gully erosion of tillage land in northeast China cause mass land degradation and threaten the safety of grain production of China. The relationship between the spatial distribution of gullies and topographic factors, such as slope angle, aspect, slope form, SPI and TWI, as well as land use and lithology are discussed in the Keshan County of Heilongjiang province. The topographic factors are derived...
Soil and water loss has been a major environmental problem in the Danjiangkou Reservoir region where slope farming is commonly practiced but the local topography is hilly. As the core water region for the "South-to-North Water Transfer Project", certain measures should be implemented to ensure the safe of water quality. In consideration of the poor socioeconomic position of local farmers,...
Laohahe Drainage Basin Lies in the upper reach of Liaohe River, and famous for its soil erosion and sediment yield. This paper estimated the soil erosion and sediment yield of Laohahe Drainage basin by ERDAS and ARCGIS software, and the relationship between land use and soil erosion / sediment yield is calculated by ARCGIS Spatial Analysis module. The results indicate that both soil erosion and sediment...
To study effects of different tillage on soil and water conservation (SWC) and soil carbon reduction on red-soil sloping land in south China, field experiments including three tillage measures(strip intercropping, contour intercropping and clean tillage) and a check were performed on the representative area named Jiangxi Eco-science Park of SWC. The surface runoff and soil loss of each treatment were...
Based on the fact that severe water erosion is mainly caused by a few torrential rains of the year, this paper derives relationship between runoff velocity variations, energy increase in per width runoff and runoff concentration caused by nonuniformity of slope, with mechanical analysis of the main dynamic, surface runoff on the slope. The result shows that the value of energy increase in per width...
Based on the indoor stimulated rainfall experiment, losses process of nitrogen with runoff and sediment investigated, and the reduction efficiency of nitrogen losses under the different width of grassed filter strips (GFS) was studied. Results showed that, compared to the results from bare-slope, losses process of nitrogen with runoff was flattened, and the nitrogen concentration changed little on...
Nanhui tidal flat is a transitional zone situated in a special area between the Yangtze estuary and Hangzhou Bay. Supported by GIS, six topographic maps from 1953 to 2004 are digitalized. Meanwhile, the underwater digital elevation models between different periods are created and analyzed to investigate the topography evolution on Nanhuizui tidal flat. The results suggest: there was distinct erosion...
Slope length is one of the important factors for slope-runoff and slope sediment yield. In order to research the role of slope length on slope erosion in the test area, the rainfall runoff observation experiments of different slope length were conducted. The experimental results indicated that runoff volume and erosion amount showed a gradually increasing trend with the increase of slope length.
Three indicators (R, I30, P), and all four indicators (R, I30, P, I) of erosive rainfall in Jia Zhaichuan small watershed of Song county are chosen respectively as the input vector to predict sedimentation volume with the two neural network of RBF and BP, and fit with the actual values. The results testify the fitting and predicted effects of RBF neural network are all better than BP network, as well...
The Through the simulating rainfall experiment, a contrast study on slope runoff and sediment yield characteristics of loess and purple soil under the same experimental conditions was conducted. The result shows that the loess slope develops the infiltration excess runoff and deeper erosion gullies, whereas the purple soil favors the saturation excess runoff with undeveloped or weakly developed slope...
Soils are a major reservoir of global carbon. Loss of agricultural soil carbon through erosion, management, and decomposition adds to the atmospheric loading of CO2. Soil erosion is a major driving force to help release the soil carbon to waterbodies and the atmosphere. The present study monitored transportation of SOC accompanying with soil erosion process at field runoff plots in the loess hilly...
Soil erosion prediction information system is a powerful tool to analyze and process the information of soil erosion and quantitatively forecast erosion. The logical structure and function of Daqinghe Basin soil erosion prediction information system were discussed by comprehensive analysis of system requirements based on a variety of spatial scales in Daqinghe Basin, which will lay the foundation...
The variation characteristics of runoff and sediment transport in main hydrologic stations of the Dongting lake was analyzed by methods of mathematical statistics, Mann-Kendall, wavelet analysis and accumulating filter from 1956 to 2008. The results show that: (1) the water and sediment entering Dongting Lake are mainly from four rivers of Hunan and the three outlets of Jinjiang River, respectively,...
Chemical conditioner provide new territory for studying China's agricultural practices, and for soil and water conservation. This study applied different consistencies of soil conditioner-polypropylene acid to China's Loess. This soil conditioner was elected macromolecule polymers of high water absorption strength in early water retention test. Through indoor soil sample's Scanning Electron Microscope...
On the Loess Plateau of China, the local people have been struggling on low incomes to guarantee their food security, and contend with some of the most serious soil erosion problems in the world. This paper discusses the application, over ten years, of an ecosystem recovery plan, introduced in the Yan'gou watershed in 1998, including large scale construction and re-vegetation projects intended to...
For scarcity of water resources and serious soil erosion in the western mountain in HENAN province, various forms of projects about rainwater resources utilization of soil and water conservation have been carried out since 1990s, from which, corresponding models of development are adopted to the rainwater resources droping on hillsides and channels, as well as small mountain springs and streams. At...
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