摘要
以黄土高原孤山川流域为研究区,采用Mann-Kendall趋势检验和Pettitt突变检验分析年际尺度水沙变化趋势和突变年份。结果表明:孤山川径流量和输沙量于1965—2014年呈现极显著减少趋势(p<0.01),突变年份为1979年和1996年,据此将研究时段划分为基准期(1965—1979年)、过渡期(1980—1996年)和效益期(1997—2014年)。同基准期相比,过渡期年均径流深和输沙模数分别减少34.11 mm和401.48t/km^2,效益期减少65.05mm和213.09t/km^2。径流深低于10mm时,水沙关系较为离散;高于该值时,水沙关系变化相对稳定。过渡期人类活动的减水减沙贡献率分别为79.12%和86.45%,效益期人类活动减水减沙贡献率分别为86.45%和87.45%。
The Gushanchuan Basin of the Loess Plateau was selected as the study area.The interannual variation of flow-sediment relationship and the mutation year were analyzed using the Mann-Kendall and the Pettitt test.The results of the runoff and sediment yield of Gushanchuan showed a significant decrease trend(p<0.01)from 1965 to 2014,and the mutation year was 1979 and 1996,according to which the study period was divided into the reference period(1965—1979),the transition period(1980—1996),and the benefit period(1997—2014).Compared with the reference period,the average annual runoff depth and sediment modulus decreased by 34.11 mm and 401.48 t/km^2 in the transition period,respectively,and decreased by 65.05 mm and 213.09 t/km^2 in the benefit period.When the runoff depth was less than 10 mm,the flow-sediment relationship was discrete.When the runoff depth was more than 10 mm,the flow-sediment relationship was relatively stable.The contribution rates of human activities for runoff and sediment reduction during the transition period were 79.12%and 86.45%,and the contribution increased to 86.45%and 87.45%in benefit period,respectively.
作者
姜泓旭
田鹏
穆兴民
赵广举
胡晋飞
连秋晗
张红
JIANG Hongxu;TIAN Peng;MU Xingmin;ZHAO Guangju;HU Jinfei;LIAN Qiuhan;ZHANG Hong(Institute of Soil and Water Conservation,Northwest A&F University,Yangling,Shaanxi 712100;College of Resource and Environment,Northwest A&F University,Yangling,Shaanxi 712100;Institute of Soil and Water Conservation,Chinese Academy of Sciences&Ministry of Water Resources,Yangling,Shaanxi 712100)
出处
《水土保持学报》
CSCD
北大核心
2020年第2期86-92,215,共8页
Journal of Soil and Water Conservation
基金
科技基础资源调查专项(2017FY100904)
国家自然科学基金青年基金项目(51509206)。
关键词
水沙关系
孤山川
场次降雨事件
水土保持措施
驱动因素
flow-sediment relationship
Gushanchuan river basin
rainfall event
soil and water conservation measures
driving factors
