摘要
降雨时空分布是影响流域径流和泥沙输送的主要因素,阐明流域内径流、泥沙随降雨时空分布的变化规律,对流域洪水预报和水土流失防治具有重要的指导意义。为此,通过设置6种降雨时空分布情景,基于SWAT构建泾河流域日尺度的水文模型,分析了降雨对径流泥沙过程的影响。结果表明,改变降雨中心对径流到达峰值的时间影响最大,仅在上游降雨可使径流峰值提前3~4 d;不同降雨时空变化对径流、泥沙影响时间的排序为降雨中心>降雨移动方向>降雨强度;降雨从下游向上游移动时,径流、泥沙同一天到达峰值,径流和泥沙的相关程度最高。
The temporal and spatial distribution of rainfall is the main factor affecting the runoff and sediment transport in the watershed.It is important to quantify the impacts of temporal and spatial distribution of rainfall on runoff and sediment at watershed scale,which is an important issue in the areas of flood forecasting,flood risk management and soil erosion control.In this paper,6 scenarios of temporal and spatial distribution of rainfall were set,and Soil&Water Assessment Tool(SWAT)was adopted to establish a daily hydrological model in Jinghe River Basin to analyze the impacts of rainfall on runoff and sedimentation processes.The results show that changing the rainfall center has the greatest impact on the time to reach the peak of runoff,and only upstream rainfall can make the peak runoff appear 3-4 days earlier;The order of the impact time of different temporal and spatial changes of rainfall on runoff and sediment from high to low is:rainfall center,rainfall moving direction,and rainfall intensity;When the rainfall center moves from downstream to upstream,runoff and sediment reach their peaks on the same day,and runoff and sediment have the highest correlation.
作者
康燕楠
降亚楠
KANG Yan-nan;JIANG Ya-nan(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Key Laboratory of Agricullure Soil and Water Kngineering in Arid and Semiarid of Ministry of Education,Northwest A&F University,Yangling 712100,China)
出处
《水电能源科学》
北大核心
2022年第1期10-13,共4页
Water Resources and Power
基金
国家重点研发计划(2016YFC0400305,2016YFC0401306)
国家自然科学基金项目(51409219)。
关键词
降雨时空分布
径流
泥沙
SWAT
泾河流域
temporal and spatial distribution of rainfall
runoff
sediment
SWAT
Jinghe river basin