水田轉作對排水系統之影響評估

本研究主要是利用平地水筒模式針對水田轉作後對排水系統在流量、水位變化上之影響進行評估。本文中首先對轉作田排水特性作一探討，並介紹平地水筒模式的概要，其次以給定計畫降雨方式來模擬流域內隨田區轉作之逕流變化。結果顯示，水田全部轉作後其對下游排水路的流出强度約增為原來之1.17～1.28倍；其次若下游側保留約60%之水田區，則可容納上游田區轉作所增加之流量，而不致帶給下游排水路嚴重的負擔。

關鍵字

逕流分析；平地水筒模式；轉作田；排水系統

並列摘要

The main purpose of this paper is to evaluate the influence of discharge and water level on drainage system when crops are changed in paddy field. The characteristics of rotational paddy field as well as the compendium of diffusive tank model are explored firstly. The variations of runoff according to crops change in paddy field are then simulated by diffusive tank model when the design storm is given. The results from the calculations show that the runoff intensity will be increasing 1.17~1.28 times of the original when crops are changed in paddy field. The increased discharge due to crops change in upstream will be stored in the paddy field, if 60% of paddy field is keeping up in downstream of the experiment basin; hence, the loading of the drainage system in the downstream are reducible.

並列關鍵字

Runoff analysis ； Diffusive tank model ； Rotational paddy field ； Drainage system

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