沟壑综合整治对小流域水沙的影响

Influence of Comprehensive Control Gully on Water and Sediment in Small Watershed

该文以甘肃省的桥子东沟、西沟流域为研究对象,分析其相似度,确定采用流域对比分析法,通过对两流域的水文监测资料(1986-2004年)的统计及对比分析,研究沟壑综合整治对小流域水沙的影响。结果表明:沟壑综合整治措施改变了小流域水分和泥沙的贮存状况,在相同降水条件下,相似流域的径流流量和含沙量过程变化趋势基本一致,但已治理流域内的产流量和产沙量指标均小于未治理流域的,且影响程度与降水量的大小相关,降水量越大,其减少量绝对值越大,但减少的相对值反而越小。

This paper selected Qiaozidong watershed and Qiaozixi watershed in Gansu province as the re- search object to analyze their similarity, then the analysis method of watersheds comparative was deter- mined. Influence of comprehensive control gully on water and sand in small watershed was studied through statistic and comparative analysis of the hydrological monitoring data of two watersheds （from1986 to 2004）. The results showed that： the situation of storage of water and sediment were changed by the meas- ures of comprehensive control gully in small watershed, under the same precipitation condition, the process and change tendency of sediment concentration and flow rate in runoff were same in the compara- tive watersheds, but the indexes of the runoff and sediment production in watershed of governance were less than the corresponding indexes in watershed of not governance, and influence degree is correlated with the precipitation, the more precipitation is, the bigger its absolute value of decrement is, the smaller rela- tive value of reduced is instead .