摘要
鉴于研究渭河源区输沙量的变化特征及影响因素,对流域内水土流失治理、水利工程规划和生态建设等具有重要意义,采用年内分配向量法、Pearson相关系数法、R/S分析法、累积距平法、通径分析法、累积量斜率变化率比较法等多种方法,分析了渭河源区1981~2016年输沙量的年内变化特征,年际变化的趋势性、突变性及气候变化与人类活动对输沙量的影响程度。结果表明,渭河源区输沙量年内分配逐渐趋于均衡,集中期呈提前趋势;年输沙量在1996年前后发生突变,突变前后减幅79.4%,在未来一段时间内继续保持减少趋势;极端降水对源区产流、产沙具有显著影响,其通过影响年最大洪峰流量而间接地对输沙量产生影响,其减少对输沙量的贡献率为12.5%,在不考虑其他气象要素的影响时人类活动对输沙量的贡献率为87.5%。
The study on the variation characteristics and influencing factors of sediment transport in the source region of Wei River has great significance to control of soil and water loss,hydraulic engineering planning and ecological construction in the basin.The annual variation characteristics of sediment transport,the trend and abrupt change of interannual variation,the influence of climate change and human activities on sediment transport from 1981 to 2016 in the source region of the Wei River were analyzed by using several methods,such as annual distribution vector method,Pearson Correlation Coefficient,R/S analysis method,cumulative anomaly method,path analysis method,cumulative slope change rate comparison method and so on.The results show that the annual allocation of sediment transport which appeared advanced trend in concentration period in the source region of Wei River verges to balance.The annual sediment transport had a sudden change around 1996 with a decrease of 79.4%before and after the sudden change,which continued to keep a decreasing trend in the future.Extreme precipitation has an obvious impact on runoff producing and sediment transport in the source region,which indirectly affects the sediment transport by affecting the annual maximal peak discharge.It is 12.5%that the contributing rate of its reduction to the sediment transport,and it is 87.5%that the contributing rate of human activities to sediment transport without considering other meteorological factors.
作者
贾杰
姜丽红
JIA Jie;JIANG Li-hong(Dingxi Hydrclogical Station,Gansu Provinee,Dingxi 743000,China)
出处
《水电能源科学》
北大核心
2022年第8期45-48,共4页
Water Resources and Power
基金
“西部之光”交叉团队项目-重点实验室合作研究专项(20200112)。
关键词
渭河源区输沙量
年内分配
年际变化趋势
影响因素贡献率
sediment transport in the source region of Wei River
annual allocation
inter-annual variation trend
contribution rate of influencing factors
