立霧溪與花蓮溪流域地下水資源量評估

Evaluating the Groundwater Resources in the Liwu and Hualien Watersheds

王士榮(Shih-Jung Wang) ； 李馨慈(Shing-Tsz Lee) ； 林宏奕(Hung-I Lin) ； 徐國錦(Kuo-Chin Hsu) ； 張閔翔(Min-Hsiang Chang) ； 黃智昭(Chi-Chao Huang) ； 李振誥(Cheng-Haw Lee)

《農業工程學報》 60卷4期 (2014/12) Pp. 20-33

https://doi.org/10.29974/JTAE.201412_60(4).0003

摘要

本研究蒐集與彙整經濟部中央地質調查所針對立霧溪與花蓮溪流域山區所進行之地下水資源調查研究計畫成果，配合經濟部水利署於兩流域設置之地下水位觀測資料，建立立霧溪與花蓮溪流域地下水流數值模式，並以建立之模式進行研究區地下水之安全出水量與可開發量評估。本研究定義地下水安全出水量，為在不影響研究區原本水文系統狀態下，研究區自然流出之地下水量。評估結果顯示，立霧溪與花蓮溪流域之地下水安全出水量分別為每年170.12~189.54百萬噸與191.31~199.23百萬噸。定義地下水可開發量，為單位面積單位地下水位洩降下，開發高潛能區中可抽取之地下水量。地下水可開發量估算結果顯示，以花蓮溪流域A區之每平方公里每年6.4百萬噸最高，之後依序為花蓮溪B區之5.3百萬噸與立霧溪之4.7百萬噸。本研究地下水可開發量評估結果較過去研究結果高，主要原因在於本研究針對地下水潛能相對較高之開發高潛能區進行評估所致。本研究之結果可提供研究區未來地下水資源規劃、開發與管理之參考。

關鍵字

立霧溪流域 ； 花蓮溪流域 ； 地下水資源 ； 數值模式

並列摘要

This study collected and combined the investigation results from the projects of Central Geological Survey, MOEA, Taiwan in the Liwu and Hualien watersheds. The groundwater level data from the Water Resources Agency, MOEA, Taiwan were also adopted. Base on the collected information and data, two groundwater numerical models for Liwu and Hualien watersheds were developed by using MODFLOW in the software of Groundwater Modeling System (GMS). The quantity of groundwater safe yield and the exploitable quantity of groundwater resources in these two watersheds were evaluated by using the developed models. The safe yield of groundwater is defined as the excess groundwater quantity flows out of the study area. The results show that the safe yields in the Liwu and Hualien watersheds are about 170.12 × 106~189.54 × 10^6 ton/year and 191.31 × 10^6~199.23 × 106 ton/year, respectively. The exploitable quantity of groundwater is defined as the pumping quantity per unit drawdown of groundwater level and per unit area in the high exploitive potential zone. There are two potential zones in the Hualien watershed naming zone A and zone B. The results show that the exploitable quantities of groundwater in Liwu watershed and Hualien watershed zones A and B are 4.7 × 10^6, 6.4 × 10^6, and 5.3 × 10^6 ton/year-km^2, respectively. The quantities are larger than those in the reference due to the estimated area in this study is focused on the high exploitive potential zone. The study results provide the information for groundwater plan, exploitation, and management in the study areas.

並列關鍵字

Liwu watershed ； Hualien watershed ； Groundwater resources ； Numerical model