Conjunctive Use of Surface and Groundwater in Kinmen
Date Issued
2006
Date
2006
Author(s)
Hung, Yu-Jen
DOI
zh-TW
Abstract
In order to resolve the problem of water shortage and avoid saltwater intrusion in Kinmen, this study used linear programming method to simulate various scenarios of water supply problems and proposed corresponding strategies associated with the conjunctive use of surface and groundwater. The numerical model, MODFLOW, was used to simulate groundwater level charges and estimate the groundwater safe yield in the wet, average and dry years in Kinmen. The analyze results revealed that the safe yields were 14.6, 11.82 and 9.7 million tons for the wet, average and dry years, respectively. A response matrix which links monthly pumping and drawdown was established based on the MODFLOW simulation.
The objective function was set to minimize drawdown which constrained by the response matrix, surface water supply, groundwater supply and total demand, and solved by LINGO. Four scenarios were investigated： Scenario A was a delay of desalination plant construction, resulting a 4.296×105 tons/year water shortage; Scenario B was a dredging works influenced the water supply in eastern Kinmen and resulting a 8.55×105 tons/half-year water shortage; Scenario C was the eutrophication of reservoirs influenced the water supply in eastern Kinmen resulting a 14.13×105 tons/half-year water shortage. The results of scenarios A, B and C show that the largest ground water table drop found in wells KM-001 and KM-005 were all above the sea level. However, in the Scenario D where the reservoirs water has been poison and resulting a 34.8×105 tons/year water shortage, the analytical results indicate that groundwater levels in most western Kinmen are lower than sea level at the end of year. The pumping of 34.8×105 tons/yr exceeds the safe yield of the groundwater and extensive saltwater intrusion may develop in western Kinmen.
Additionally, this work suggests that surface reservoirs dredging and construction of desalination plants should be carried out to supply the future water need in eastern Kimen. Furthermore, the groundwater in western Kinmen can supply partially water-needs in the eastern Kinmen using pipeline connection. However, the safe yield should not be exceeded to avoid seawater intrusion.
Subjects
金門
聯合運用
響應矩陣
地下水
MODFLOW
Kinmen
conjunctive use
response matrix
groundwater
SDGs
Type
thesis
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