應用河道水位變化評估新虎尾溪地下水補注量之研究

The Effect of the Variation of Stream Water Level on Estimation Groundwater Recharge in Hsinhuwei Stream

謝壎煌(Hsun-Huang Hsieh) ； 陳忠偉(Jung-Wei Chen) ； 葉信富(Hsin-Fu Yeh) ； 李振誥(Cheng-Haw Lee)

《農業工程學報》 53卷2期 (2007/06) Pp. 50-60

https://doi.org/10.29974/JTAE.200706.0006

摘要

雲林縣因地下水超抽而為地層下陷嚴重區，且高鐵將由北至南經由西螺、虎尾、土庫與元長等鄉鎮，地層持續下陷將對結構安全造成威脅，因此增加該地區地下水補注，減緩地層下陷實為重要議題。本研究主要利用河道流量估計法(SF)與地下水流數值軟體MODFLOW (MF)推估新虎尾溪本研究河段之河道滲漏量，以Ferris (1962)解析模式與MF法評估河道水位上升後所增加之河道滲漏量，各模式所需之水力參數分別由現地試驗及室內實驗獲得。研究成果顯示，SF與MF法推估河道年滲漏量分別為264.2與170.9萬噸。Ferris與MF法推求河道水位上升2.5m後，所增加之河道年滲漏量分別為31.6與26.4萬噸。由SF、Ferris與MF方法推估抬升河道水位對滲漏量可增加10.0%至18.5%效益。

關鍵字

河道流量估計法 ； MODFLOW ； 河道滲漏量

並列摘要

Land subsidence is serious in Yunlin area because of groundwater over pumping. There exist the safety risk of the high-speed rail structures through the area of Siluo, Huwei, Tuku, and Yuanchang towns from north to south in Yunlin area. Therefore, it is an important issue in the increasing groundwater recharge and the remedying land subsidence in Yunlin area. The purpose of this study is to estimate the stream infiltration under consideration at the variation of the stream water level in Hsinhuwei stream. Three models of stream-flow estimation model, Ferris analytical model, and MODFLOW model are performed with the hydraulic parameters obtained form field observation and laboratory experiment. Stream infiltration is considered as groundwater vertically recharge. The results indicate that assessment of the stream infiltrations obtained with stream-flow estimation model and MODFLOW model are 2, 642, 000 and 1, 709, 000 tons/year, respectively. As the stream water level raised about 2.5 meters, the amounts of stream infiltration estimated from the Ferris analytical model and MODFLOW model are significant increments of 316, 000 and 264, 000 tons/year, respectively. Consequently, the increased stream storages result an increasing groundwater recharge of 10.0% to 18.5%.

並列關鍵字

Stream-flow estimation model ； MODFLOW ； Stream infiltration