莫拉克風災後高屏溪攔河堰周邊地下水位之研究

The Study of Groundwater Level for Kaoping River Weir Surrounding after Typhoon Morakot

陳長榮(Chang-Rong Chen)

指導教授 ： 丁澈士

國立屏東科技大學/工學院/土木工程系所/碩士(2014年)

https://doi.org/10.6346/NPUST.2014.00087

摘要

臺灣雖雨量豐富，但由於地形特殊、河川短而急且年雨量分佈極度不均，因水源開發方式拘限，可供利用的地面水十分有限，在現今社會普遍反對興建水庫下，地下水源的開發及利用逐漸受到重視，屏東平原更是如此，而且地下水具有水質、水溫、水量穩定，且取用方便、儲存及調節量大等優點。本研究利用高屏溪攔河堰周邊之現有地下水井做區域性地下水位觀測，並取用莫拉克風災前後高屏溪攔河堰之周邊地下水位資料，來探討其周邊地下水近年來是否受莫拉克風災之影響及周邊用水行為，來交互比對並研究出周邊地下水有無明顯變化之情形。研究結果顯示：2009年整體水位有較往年高的情形，故可以推斷出在莫拉克風災後，因為河床淤積及莫拉克颱風造成周遭環境的破壞，使得高屏溪攔河堰周遭地下水及地面水有了減少的狀況。而2009年8月前河川水位與地下水位其相互關係較為明顯，而在莫拉克颱風後，地下水位與河川水位之關係較無明顯一致性。整體水位差距最大約為1.8公尺，最高水位約在9月到11月，而最低水位約在3月到7月這個區間，再對照附近農業用水行為可發現，附近主要種植作物，主要需水時間約在4月到7月這個區間，故研究推論這段時間地下水位明顯受到附近農業用水行為所影響最大。

關鍵字

地下水利用 ； 莫拉克颱風

並列摘要

Taiwan has an abundant precipitation with mean annual rainfall on Taiwan proper is approximately 2,500 millimeters. Southern Taiwan receives 90 percent of its rainfall between May and October. Throughout Taiwan, November to February is the driest period. Today's society generally opposed the construction of reservoirs, the development of groundwater sources and the utilization of increasing attention, especially in the Pingtung Plain, groundwater resource has the conditions for supply with better quality, stable temperature and easy accesses with a huge storage capacity and easily regulars the water supply. In this study, the utilization of existing groundwater wells surroundings the weir is to take the Kaoping regional groundwater monitoring wells and to access to the surroundings groundwater level data before and after Typhoon Morakot at the Kaoping River Weir. In recent years, to explore the surrounding groundwater is affected by Typhoon Morakot influence hurricane behavior and the surroundings water courses, compared to interaction and worked out whether the apparent change in the situation of the surroundings groundwater. The results show that an entire groundwater levels are higher than in previous years the situation of groundwater in 2009, it can thus be inferred after Typhoon Morakot. Typhoon Morakot because of silting and damage the surrounding environment have been made the Kaoping River Weir surroundings groundwater and surface water downward the reduced condition. Before August 2009, the river water and groundwater their relationships are the more obvious, and after Typhoon Morakot the relationships between groundwater levels and river water as compared to no consistency. The highest difference to entire level ca. 1.8 meters, the highest level in September to November, and the lowest level in March to July are laid at this interval. The control behavior can thus be found in the vicinity of agricultural water supply mainly near to the crop fields, the mainly water demand time are laid in April to July at this interval. It is obvious that the groundwater fluctuations are affected in terms of agricultural water needs.

並列關鍵字

Ground Water ； Typhoon Morakot

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