黄土高原近30年降水集中度分析及时空演变特征  

Spatial-Temporal Evolution of Precipitation Concentration in the Loess Plateau During the Recent 30 Years

作　　者：李泽国 郑德凤[1] Li Zeguo;Zheng Defeng(College of Geographical Sciences,Liaoning Normal University,Dalian 116029,Liaoning,China)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连116029

出　　处：《绿色科技》2024年第2期73-77,共5页Journal of Green Science and Technology

基　　金：2023年度辽宁省经济社会发展研究课题(编号:20231s1ybkt-080)。

摘　　要：选取近30年的黄土高原地区58个气象站点的降水数据,分析了黄土高原年降水以及降水集中度(PCD)和集中期(PCP)的时空变化特征,结果表明:(1)黄土高原地区年均降水量在50~900 mm,空间分布上东南高西北低。降水高值区分布在三门峡站与武功站附近以及五台山站,年均降水量为900 mm;低值区位于临河站附近,年均降水量为50 mm;(2)黄土高原地区的降水集中度分布于0.43~0.76,自东南向西北递增;而降水集中期的变化则不太明显,多集中于夏季的7-8月份。因此在降水集中的7-8月份,水土流失会比较加重,应加强水土流失防治工程,在降水量大的月份做好灾害防护,为工农业生产提供预警,减少工农业生产损失与经济损失。This paper analyzes the precipitation data from 58 meteorological stations in the Loess Plateau region over the past 30 years,and focuses on the characteristics of annual precipitation,precipitation concentration degree(PCD),and concentration period(PCP).The following conclusions are drawn:(1) The annual average precipitation ranges from 50 to 900 mm in the Loess Pateau,with a spatial distribution of higher values in the southeast and lower values in the northwest.The high-value areas are located in Sanmenxia and Wugong stations,as well as Wutaishan station,with an annual average precipitation of about 900 mm.The low-value areas are in Linhe station,with an annual average precipitation of around 50 mm.(2) The precipitation concentration degrees in the Loess Plateau range from 0.43 to 0.76,and increases from southeast to northwest.The variation of the concentration period is not very pronounced,and mostly concentrates in July and August of summer.Therefore,soil erosion is more likely to intensify during the concentrated precipitation in July and August.It is essential to strengthen soil erosion control projects and disaster prevention measures during these months of summer,and provide early warnings for agricultural industrial production to minimize production reduction and economic losses.

关 键 词：黄土高原地区 年均降水量 降水集中度 降水集中期 时空特征 

分 类 号：TV125[水利工程—水文学及水资源]