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

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0.037.当降雨持续时间小于6 h时K值在0.04~0.045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6 h时, K值为0.027.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19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11.7~27.4 mm, 区域平均降雨量比次平均降雨量高18.4 mm.
- 降雨量;
- 修正
Abstract: 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′.
- Rainfall;
- Correction

图 1 降雨量P和次降雨量P′的关系

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图 2 降雨强度和降雨订正系数的关系

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表 1 降雨持续时间和降雨量订正系数的关系

表 2 甘肃河东雨养农业区6~9月雨量的修正

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