摘要
利用长武县气象局1957—2006年的日降水量资料,分析该地区降水的年内、年际变化、概率分布特征等。结果表明:该区降水量季节分布不均,主要集中在7—9月;降水量的年际变化幅度较大,多年变化呈明显的丰水、平水、枯水年交替发生现象;降水量的年际变化大于年降水时间的年际变化。对侵蚀性降雨研究发现,其主要发生在7、8月,以降雨量小于30 mm的降雨次数较多;降雨强度随降雨量增加而减小;同时,以短历时降雨为主,历时在30min以内的降雨次数较多,其他时段相对较少。
The monthly and annual distribution characteristics of precipitation as well as the probability distribution of annual precipitation were studied, utilizing the daily precipitation from 1957 to 2006, data of which supplied by the Changwu Meteorological Station. The results demonstrate that the distribution of monthly precipitation is variable, and mainly concentrated in July, August, and September. The total annual precipitation varied greatly from year to year. The annual variation of precipitation is larger than the annual variation of rainy days. Analysis of the soil erosive rainfall showed that the highest occurrence of rainfall happened in July and August. The times of rainfall that amounts of rainfall less than 30 mm were more than others. As to single soil erosive rainfall, the rainfall intensity reduced along with the rainfall amount increasing. Meanwhile the times of rainfall duration within 30 min are more than that over 30 min.
出处
《中国水土保持科学》
CSCD
2009年第1期27-31,56,共6页
Science of Soil and Water Conservation
基金
中国科学院知识创新工程重要方向项目“黄土高原旱作农田生产力及水分生态过程调控”(KZCX2-YW-424)
“十一五”科技支撑计划项目课题“黄土高塬沟壑区农果林多元综合治理模式研究与示范”(2006BAD09B09)
关键词
降水量
侵蚀性降雨
黄土高塬沟壑区
precipitation
erosive rainfall
Loess Plateau-gully Region
