An Estimation Model for Irrigation Rate
Date Issued
2006
Date
2006
Author(s)
Ku, Chien-Tin
DOI
zh-TW
Abstract
Irrigation consumes more than 69% of the total water supplies in Taiwan. A more efficient and effective irrigation demand planning is the basis for sound regional water resource management. The method of irrigation rate is a traditional irrigation demand estimation tool used by most of the irrigation association in Taiwan. The irrigation rate is the area that can be properly irrigated with a unit flow rate. These empirical indices were developed by the field irrigation engineers through years of field irrigation experiences. But these empirical indices may no longer valid from the recent rapid change in cropping patterns in most of the irrigation command areas due to the socio-economical development and Taiwan’s participation into the WTO in 2002. The objective of this study is to establish a estimation model for irrigation rate under changing environments.
The command area of the ChiaNan Irrigation Association, the largest one in Taiwan, is selected as the study area. Related data for regional irrigation demand estimation are collected into a database to establish a regional irrigation demand estimating model. This model is validated using the past cropping patterns and irrigation records. This model is then used as a data generator for generating irrigation demand data under different cropping pattern including fallow. These data are then used as the basis for regression analysis to develop algorithm for irrigation rate estimation under different field conditions.
The results show that the irrigation rates are mostly correlated to paddy farming area, crop coefficients, and temperature. There are different formulations for first and second crop of paddy. Whether the area other than paddy farming is fallow or is planned as other crops can also affect the irrigation rate estimation. There are consequently four formulations for the study region. The irrigation planner can estimate the irrigation rate by choosing the corresponded formula for their target field situation. This will increase the efficiencies and effectiveness for regional irrigation demand planning under rapidly changing environment.
Subjects
灌溉率
灌溉用水量
休耕
混植
統計迴歸
Irrigation rate
Water requirement
Fallow
Mixing planting
Regression
SDGs
Type
thesis
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