Model Development for Shi-Chung River Hot Springs and Analysis of Groundwater Level and Temperature Change
Date Issued
2015
Date
2015
Author(s)
Lu, Hong-Wei
Abstract
Shi-Chung River is the passage through which people go to Mu-Dan village, and there are nature hot springs welling from the underground which we call Chu-Tang in the ancient times. There is basin surrounded by mountains, and rivers flow across. Ancient people always come in and go out along four bending and hard walking river by ford, so we call Shi-Chung River. Shi-Chung River Hot Springs is one of the four great hot springs which are Bei-Tou, Yang-Ming Mountains, and Guan-Zi-Ling Hot Springs in Taiwan during the Japanese occupation. The temperature ranges from 50 to 60℃; ph between 7.9 and 8. The Shi-Chung River Hot Springs belongs to the carbonate spring. Recently, the continuous and acute decline of groundwater level in Shi-Chung River Hot Spring zone indicates possible overdraft of the hot spring resources. In order to avoid exhausting the hot spring resources, a better understanding of the groundwater level and temperature change in this area is necessary. In this study, the impact of precipitation and pumping on water level and temperature is investigated. This study also use different pumping quantity to observe the change of level and temperature. SWAT is applied to simulate the effective infiltration. This step requires gathering information such as land-use, soil-geology, surface elevation, river systems and weather. The effective infiltration then serves as input in SHEMAT. Along with setting hydrogeology and thermal parameters, the position of fractures, and the boundary and initial conditions, SHEMAT can simulate the change of water level and temperature. The pumping is calibrated starting with the permitted water rights for pumping by Pingtung government for all local hot spring hotels. As a result, the peak pumping is calibrated as 1,047 ton/day in December and foot pumping as 719 ton/day in July. Moreover, the model is better calibrated at the center of the hot spring zone, and the overall simulated pattern of water level and temperature match the observation. In addition, the simulate values can be used to conjecture the reasonable pumping quantity. We adjust the reasonable pumping quantity’s scale to study the influence of groundwater level and temperature, and know groundwater level can’t rise to initial value even if we use the reasonable pumping quantity to pump. The temperature will decrease, because the pumping quantity will be increasing. Finally, the influence of effective infiltration on groundwater level and temperature change is analyzed. The groundwater level increases by 3.8m-6.9m level and temperature decreases by 0.1℃ with the existence of infiltration among all observation wells.
Subjects
Groundwater Level and Temperature
Effective Infiltration
Shi-Chung River Hot Springs
SDGs
Type
thesis
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