农田土壤水资源评价中降雨量的修正  

RAINFALL CORRECTION CONCERNING ASSESSMENT ON CROPLAND SOIL WATER RESOURCES

作　　者：杨兴国[1] 柯晓新[1] 张旭东[1] 杨启国[1] 

机构地区：[1]兰州干旱气象研究所,兰州730020

出　　处：《应用气象学报》2001年第1期123-126,共4页Journal of Applied Meteorological Science

摘　　要：利用大型称重式蒸渗计测得的地面降雨量 (P)和自记雨量筒测得的次降雨量 (P′)进行比较 ,结果表明两者之间存在较好的线性关系 ,而且地面雨量大于雨量筒测量的次降雨量 ,平均雨量订正系数 K为 0 .0 37.当降雨持续时间小于 6h时 K值在 0 .0 4～ 0 .0 4 5之间 ,不同降雨持续时间之间差值不大 ;当降雨持续时间大于 6h时 ,K值为 0 .0 2 7.随着降雨强度的增大 ,降雨订正系数呈下降趋势 .根据不同降雨强度下的降雨订正系数对甘肃河东 1 9个气象站 6～ 9月的雨量修正结果表明 ,各站降雨量比次降雨量多 1 1 .7～ 2 7.4mm,区域平均降雨量比次平均降雨量高 1 8.4mm.Applying the rainfall ( P ) measured through lysimeter and the automatic recording rainfall ( P′ ), a comparison has been made. The relation between P and P′ is linear,and P is larger than P′ . The mean correction coefficient of rainfall ( K ) is 0.037. K is 0.04 to 0.045 on condition that rainfall duration is shorter than 6 h and otherwise K is 0.27. K decreases with the increase of rainfall intensity. Meanwhile, the rainfall correction from June to September in the rainfed region of Gansu (RRG) including 19 meteorological stations also has been made. The result is that P is about 11.7 to 27.4 larger than P′ . The mean P on the area of PRG is 18.4 mm larger than mean P′ .

关 键 词：降雨量 修正 农田 土壤 水资源 评价 蒸渗计 

分 类 号：S273[农业科学—农业水土工程] P426.6[农业科学—农业工程]