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GeoWEPP模型在沟头填埋工程中的应用
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Abstract:
黄土高塬塬面为农作物提供了广阔的生长环境，也形成了以塬面为依托的政治、文化、经济中心。但由于土壤疏松、生态脆弱，降雨时空分布不均，致使水土流失严重。“固沟保塬”是黄土高塬生态文明建设的重点工作。采用模拟“固沟保塬”工程情景的方法，在遥感和地理信息系统的支持下，改变地形条件，利用分布式水文模型对沟头填埋前后侵蚀量的变化进行水文模拟。本文将甘肃省庆阳市董志镇的杨家沟作为研究区，利用ArcGIS空间分析功能处理DEM、土壤类型等数据，再用GeoWEPP模型模拟土壤侵蚀，对比分析在沟头填埋前后黄土高原沟壑区径流量和产沙量的变化。结果表明：沟头填埋对于治理水土流失有一定的效果，为黄土沟壑区土壤侵蚀治理方案的可行性提供有效的验证手段。
Loess Plateau provides a broad growing environment for crops and forms a political, cultural and economic center based on the plateau. However, due to the loose soil, fragile ecology and uneven distribution of rainfall, soil erosion is serious. Gully Consolidation and Highland Protection is the key work in the construction of ecological civilization in Loess Plateau. Using the method of simulating the Gully Consolidation and Highland Protection engineering scene, with the support of remote sensing and GIS, the terrain conditions are changed and the hydrological model of the change of the erosion amount before and after the gully head landfill is used for hydrological simulation. In this paper, Yangjiagou of Dongzhi town in Qingyang city of Gansu province was chosen as the research area. The spatial analysis function of ArcGIS was used to process DEM and soil type data, and GeoWEPP model was used to simulate soil erosion, the variation of runoff and sediment yield in gully head landfill before and after landfill was analyzed. Results show that gully head landfill has a certain effect on soil erosion control and provides an effective verification method for the feasibility of soil erosion control scheme in the Loess Plateau.
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