Expanding the Flexibility of Irrigation Management Using Intermediate Storage

• Main Authors: Chi-Pong Huang, 黃志鵬
• Other Authors: 蘇明道
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/38987092736107544196

碩士 === 國立臺灣大學 === 生物環境系統工程學研究所 === 93 === The ChiLi Command area of ChiaNan Irrigation Association was used as the study area. Factors, such as soil, weather, crop kind, crop phenology, time from last irrigation, distance to the diversion source, etc that affecting farmer irrigation behavior were identified and the relation importance of each factor was studied by using Analytic Hierarchy Process. An irrigation will index was proposed by combing the above factors to simulate the irrigation behaviors of farmers. The irrigation demand under farmers’ freewill was estimated by system simulation using historical weather data and was compared with the traditional one. Intermediate storage was also proposed to regulate the mismatch of demand and supply. It is found that the two most important factors affecting farmers’ irrigation decisions are weather and crop phenology. The irrigation demand increased under irrigation management with farmers’ freewill because the effective rainfall decreased as the irrigation frequency increased. Evaportranspiration also increased as the soil moisture was maintained at higher level under frequent irrigation. This is especially true for crops other than paddy. The water shortage decreased with intermediate storage. The design capacity of the storage was also studied with respect to the risk of irrigation shortage.