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为了掌握青杠扒小流域水沙变化特性,采用Mann-Kendall趋势检验法分析其降雨、径流、泥沙随时间的变化,并研究了降雨-径流和径流-泥沙的相关性及其双累积曲线的相关性,结果表明:年降雨量、径流深随时间的变化的趋势性不明显,年均输沙模数随时间具有明显的下降趋势;降雨-径流的相关性较好,而径流-泥沙的相关性较差,1996-2006年径流随降雨增加的幅度小于1984-1995年,但产沙量却高于1984-1995年,经双累积曲线分析,主要是由这一时期人为活动较多所致。人类活动对流域水沙的影响既与人类活动的方式、程度有关,也会受到环境条件的限制。
In order to grasp the characteristics of runoff and sediment change in Qingbachang small watershed, the changes of rainfall, runoff and sediment over time were analyzed by Mann-Kendall trend test, and the correlation between rainfall-runoff and runoff-sediment accumulation and their double accumulation The results show that the trend of annual rainfall and runoff depth with time is not obvious, and the average annual sediment transport modulus declines obviously with time. The correlation between rainfall and runoff is better, while the runoff- The correlation between sediment and sediment is poor. The runoff increases with rainfall during 1996-2006 is less than that of 1984-1995, but the sediment yield is higher than that of 1984-1995. According to the double cumulative curve analysis, it is mainly caused by the human activities during this period More due. The impact of human activities on the water and sediment in the drainage basin is not only related to the manners and degrees of human activities, but also influenced by environmental conditions.