摘要
为了探究沈阳地区天然降雨雨滴特征与产沙量的关系,在天然降雨条件下,使用滤纸色斑法计算雨滴特征,利用野外径流小区(长8m,宽1m)采集沙样。运用相关分析法、灰色关联分析法和模糊贴近度分析法分析了降雨强度、雨滴动能、雨滴中值粒径、雨滴终点最大速度和雨滴质量与产沙量的关系。结果表明:经过相关分析和灰色关联分析,影响坡面产沙量的顺序为降雨强度>雨滴动能>雨滴中值粒径>最大雨滴终点速度>雨滴质量,模糊贴近度分析表明降雨强度对坡面产沙量的影响最大,降雨动能其次,雨滴质量影响最小。坡面产沙量分别与降雨强度、雨滴中值粒径、雨滴动能呈幂函数关系;天然降雨雨滴中值粒径与降雨强度呈幂函数关系;雨滴中值粒径和雨滴质量是雨滴动能的主要影响因子。
This article aims at analyzing the relationship between sediment yield and different raindrop characteristics based on natural rainfall in Shenyang Region.Within natural rainfall,the runoff plots（8min length and 1min width）had been used to collect sedimnent samples,and the raindrop characteristics were calculated based on filter paper splash procedure.The relationship between sediment yield,raindrop quality and rainfall intensity,the kinetic energy of raindrops,raindrop median diameter,the maximum terminal velocity of raindrops were analyzed respectively by correlation analysis,gray relative analysis method and nearness degrees analysis.Results of correlation analysis and gray relative analysis were same,which followed the order：rainfall intensity〉raindrop kinetic energy〉raindrop mean diameter〉maximum raindrop terminal velocity〉raindrop quality;while the nearness degrees analysis showed that rainfall sediment yield on the slope was mostly affected by rainfall intensity,followed by raindrop kinetic energy and raindrop quality being came next;There was a power function relationship between sediment yield and rainfall intensity,D50,kinetic energy of raindrops respectively,and it was the same relation between the raindrop mean diameter of natural rainfall and rainfall intensity;raindrop mean diameter and raindrop quality were the main two influencing factors on the raindrop kinetic energy.
出处
《水土保持研究》
CSCD
北大核心
2017年第2期12-16,共5页
Research of Soil and Water Conservation
基金
辽宁省自然基金"坡耕地不同耕作模式产流产沙规律试验研究"(201102193)
关键词
雨滴
坡面产沙量
相关分析
灰色关联
模糊贴近度
raindrop
sediment yield
correlation analysis
gray relative analysis
nearness degrees analysis
