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研究生:陳俊焜
研究生(外文):Chen, Jiunn-Quan
論文名稱:濁水溪沖積扇地下水資源調配與管理之研究
論文名稱(外文):Study of groundwater resources management in Chou-Shui alluvial fan
指導教授:李振誥, 吳銘志
指導教授(外文):Lee Cheng-Haw, Wu Ming-Chee
學位類別:碩士
校院名稱:國立成功大學
系所名稱:資源工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:254
中文關鍵詞:濁水溪沖積扇地下水地下水資源調配與管理
外文關鍵詞:MODFLOWChou-Shui alluvial fangroundwatergroundwater resouces managementMODFLOW
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由於濁水溪沖積扇地區富水層二為目前濁水溪沖積扇之地下水主要來源,
本文乃就此富水層作地下水資源調配與管理之研究。首先利用MODFLOW軟
體對地下水流動進行模式模擬,以求出符合現地狀況的水文地質架構與水
力參數。然後收集已驗證的典型地下水水位時段,並根據濁水溪沖積扇地
區地下水資源開採分佈、強度及未來開採變化,模擬出最佳單位脈衝值及
響應矩陣,最後通過響應矩陣,將地下水流連續性方程式作為等式限制條
件併入最佳化模式,構成地下水資源管理模式,達到推估濁水溪沖積扇地
區地下水資源合理利用之目的。所得模擬結果指出,在地下水流動模擬方
面:於二維的地下水流場中,富水層二的淨抽水量為原濁水溪沖積扇地區
總調查量的1/5,地下水補注區約在靠近研究區東南方及近濁水溪的地區
。在管理模式中,以四個抽水方案、五個注水方案相互配合,模擬未來兩
年內及五年內之水位變化,使達到兩年內原來低於零水位線下之富水層二
的面積不再增加,並於五年內使低於零水位面下之面積減少一半之目標。
在每年抽水5億噸的方案(方案A5)及每年抽水4.5億噸的方案(方案A6)
下,若是與採扇尾鄉鎮不注水(方案B7)、扇尾及近扇尾鄉鎮不注水(方
案B8)兩方案配合,則每年注水1.32億噸(包括自然補注水1億噸)便能
達成兩年及五年之目標;若採只有在扇頂鄉鎮注水(方案B9)的方式,則
每年注水1.32億噸(包括自然補注水1億噸)便能達成兩年之目標,但須
每年注水2.66億噸(包括自然補注水1億噸)方能達成五年之目標;若採
自然補注水和人工回灌水分開處理(方案B10)的方式,則每年人工回灌1
百萬噸的水量即可達成兩年之目標,但需回灌3千萬噸至4千萬噸的水量,
方有可能達成五年之目標。在每年抽水4億噸的方案(方案A7)下,相同
的若是與方案B7、方案B8配合,則每年注水1.32億噸(包括自然補注水1
億噸)便能達成兩年及五年之目標;若採方案B9的方式,則每年注水1.32
億噸(包括自然補注水1億噸)始能達成兩年之目標,每年注水2.32億噸
(包括自然補注水1億噸)便能達成五年之目標;若採方案B10的方式,每
年以人工回灌1百萬噸的水量即可達成兩年的目標,但要達成五年內之目
標,則回灌水量須達到2千萬噸至3千萬噸。在每年抽水4億噸,但扇尾的
需水改由扇腰及扇頂供給的方案(方案A8)下,其與前述相同,若是方案
B7、方案B8配合,則每年注水1.32億噸(包括自然補注水1億噸)便能達
成兩年及五年之目標;若採方案B9的方式,則每年注水1.32億噸(包括自
然補注水1億噸)
亦能達成兩年及五年之目標;若採方案B10的方式,則僅需每年以人工回
灌1百萬噸便能達到兩年及五年之目標。
Since the aquifer II is the main groundwater resource of Chou-
Shui alluvial fan, the objectives of this study are to
investigate the planning and management strategies of
groundwater resource development for this aquifer. The MODFLOW
computer code was firstly applied to simulate the 2-D
groundwater flow pattern of the area, in order to find the
suitable hydro-geological structure, and in situ hydraulic
parameters. The method of response matrix was then adapted to
simulate the development management plan of this
aquifer. The hydro-geological data, for instance, the
distribution of wells, the discharge stress, and the change of
discharging plan, were used to calibrate the groundwater
development conditions, in order to obtain the best unit pluse
value and response matrix. Then, the combined simulation-
optimization approach is applied to get the groundwater resource
management model. Several simulation cases on discharge and
recharge management models are performed and discussed.
Simulation results indicate that the net discharge of aquifer II
is one fifth of the total volumn investigated in the Chou-Shui
alluvial fan. The groundwater recharge area is located in the
southeast of the studied area near the Chou-Shui river. In the
management models, four discharge cases and five recharge cases
are performed to simulate the change of water level within the
two and five year periods. The goals are to control the area of
where the water table was originally below zero, namely, the
area will not be increased any more in two years, and it is to
be decreased to half of its original area in five years.
If one combines the case that discharges 500 million tons of
water each year (Case A5) and the case that discharges 450
million tons of water each year (Case A6), with the cases of
these are not recharging the towns located at the distal-fan
(Case B7), and also are not changing those towns located at or
closed to the distal-fan area (Case B8); thus, 132 million tons
of water ( including 100 million tons of naturally recharged
water) are needed to charge the area each year, such that it
will make both of the 2-year''s and the 5-year''s goals to
be reached. If recharge has only been done in the towns located
at the proximal fan (Case B9 ), then the 2-year''s goal can be
reached by charging 132 million tons of water each year (this
includes 100 million tons of naturally recharged water);
however, 266 million tons of water per year (including 100
million tons of naturally recharged water) will be needed to
reach the 5-year''s goal. In the cases of separately using the
naturally recharged water and artificially injected water (Case
B10 ), the 2-year''s goal can be reached by artificially
injecting 1 million tons of water each year, however 30 million
to 40 million tons of water are needed to be injected to
possibly reach the 5-year''s goal.
If the case that discharging 400 million tons of water each year
(Case A7) is also to be combined with Case B7 and Case B8, then
132 million tons of water per year for recharging (including 100
million tons of naturally recharged water) are needed to fulfill
both of 2-year''s and 5-year''s goals. If conditions of Case B9
is assumed, 132 million tons of recharging water in each year
(including 100 million tons of naturally recharged water) will
be enough for the 2-year''s goal, and approximately 232
million tons of recharging water in each year (including 100
million tons of naturally recharged water) will be needed for
reaching the 5-year''s goal. If conditions of Case B10 are used,
2-year''s goal can be reached by injecting 1 million tons of
water artificially each year; yet, for the 5-year''s goal to be
reached, a volumn of 20 million to 30 million tons of water is
needed to be injected.
In the case of discharging 400 million tons of water each year,
however the water for recharge is provided to the mid-fan and
the proximal fan areas instead of the distal-fan region (Case
A8), as it was before, if conditions of Case B7 and Case B8 are
combined, then both of the 2-year''s and the 5-year''s goals may
be reached by recharging 132 million tons of water in a year(
including 1 million tons of naturally recharged water). Same
conditions may be set to reach the goals in Case B9. In the
case of Case B10, both 2-year''s and 5-year''s goals can be
fulfilled by injecting 1 million tons of water artificially each
year.
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