上方来水条件下工程开挖面土壤侵蚀模型研究
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摘要
工程开挖面是生产建设项目水土流失的主要来源之一,但工程开挖面土壤侵蚀定量研究非常有限,势必影响开挖面土壤侵蚀量及危害的准确评估。该研究通过理论分析与野外放水实验相结合,一方面借鉴RUSLE建模思路,理论推导上方来水条件下开挖面土壤侵蚀模型,并对模型参数进行了详细分析,另一方面通过野外小区现场放水实验,探讨开挖面土壤侵蚀关键影响因素,将实测数据应用于模型及参数的率定和验证。结果显示,坡度、坡长、质地、以及来水总量等参数均与单位面积土壤流失量呈显著相关,建立的上方来水条件下开挖面土壤侵蚀模型,经实测数据率定与验证,模型预测效果较好。该模型针对性强,不仅原理简单,各参数均具有一定的物理意义,而且参数易获取,具有很好的实用性和可操作性,可为有汇水影响开挖面土壤流失量测算提供科学依据。
引文
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