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Soil erosion in a small watershed in water source areas of Beijing and Tianjin:Spatial simulation
Authors
张应龙
张怀
+3 more
江青龙
谢永生
郝晓东
Publication date
1 January 2011
Publisher
Abstract
针对京津水源区生态环境脆弱、水土流失空间分异大、突发性强等问题,以河北省平泉县东北沟典型小流域为例,采用GIS技术与CSLE模型对其土壤侵蚀进行二维空间模拟及侵蚀规律研究,并对模型模拟精度进行验证。结果表明:模型确定性系数>0.85,模拟结果可信度高;小流域侵蚀模数为2359.24t·km-2·a-1,属于轻度侵蚀,侵蚀主要源于15°以上坡面,占侵蚀总量的92.1%;土壤侵蚀模数随坡度先逐渐增加,当坡度>45°时,土壤侵蚀模数有减小的趋势;土壤侵蚀模数空间异质性显著,坡耕地侵蚀模数最大,为6112.90t·km-2·a-1;荒草地占总面积33.2%,侵蚀量却达总量的74.9%;59.3%的侵蚀来自阳坡和半阳坡,而阴坡半阴坡仅占流域侵蚀量的16.2%。研究为利用CSLE模型对小流域土壤侵蚀进行空间模拟提供技术范例,为京津水源区土壤侵蚀规律研究及水土保持生态建设提供科学参考
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018