Comparative Study of Effective Rainfall Estimation Methods for Lowland Rice

被引：21

作者：

Mohan, S. ^{[1
]}

Simhadrirao, B. ^{[1
]}

Arumugam, N. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Civil Engn, Hydraul & Water Resources Engn Div, Madras 600036, Tamil Nadu, India

来源：

WATER RESOURCES MANAGEMENT | 1996年 / 10卷 / 01期

关键词：

evapotranspiration; effective rainfall; irrigation requirements; paddy rice;

D O I：

10.1007/BF00698810

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Dastane (1974) recommended four different methods, namely evapotranspiration-rainfall ratio method, Indian-1 and Indian-2 methods and Vietnam method for estimating effective rainfall for rice crop. These methods together with the USDA-SCS method were compared against the physically-based water balance method. The analysis was carried out using daily data of evapotranspiration (ET) and rainfall pertaining to thirteen seasons with special reference to lowland paddy rice in South India. Among the different methods, the ET-rainfall ratio and Indian-2 methods estimate the effective rainfall values nearly closer to those by the water balance method. The USDA-SCS method underpredicts values of effective rainfall compared to other methods. The ET-rainfall ratio and Indian-2 methods can be used as alternatives to the water balance method for determining effective rainfall which in turn be used in estimating irrigation requirements for lowland rice.

引用

页码：35 / 44

页数：10

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