Dynamic analysis of the infiltration rate of artificial recharge of groundwater: a case study of Wanglong Lake,Pingtung, Taiwan |
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Authors: | Yung-Chang Tu Cheh-Shyh Ting Hsin-Tien Tsai Jung-Wei Chen Cheng-Haw Lee |
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Institution: | (1) Graduate Institute of Disaster Prevention on Hillslopes and Water Resources Engineering, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan;(2) Department of Civil Engineering, Centre for Water Resources Education and Studies, National Pingtung University of Science and Technology, Pingtung, 912, Taiwan;(3) Department of Earth Science, National Cheng Kung University, Tainan, 701, Taiwan;(4) Institute of Hot Spring Industry, Chia-Nan University of Pharmacy and Science, Tainan, 717, Taiwan;(5) Department of Resources Engineering, National Cheng Kung University, Tainan, 701, Taiwan; |
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Abstract: | Although Pingtung plain is an agriculturally developed region, its limited hydrologic conditions have restrained the maximization
of its surface water resources. Due to the lack of proper management and sustainable utilization, groundwater has been overdrawn,
causing serious land subsidence and seawater intrusion. The present paper presents a pilot study for artificially recharging
groundwater using high-infiltration basins. Results of the geometric factor show that the large basin is ca. 6.8 times the
size of the small one, with the infiltration volume almost approaching 1 m3/day/m2. In the groundwater variation, the MW-2 is located immediately below the infiltration basin; therefore, its water level rises
more rapidly than that of MW-3. As for the infiltration volume, results of the experiment used the same basin since 2002,
which shows that the volumes gradually decreased from 12,136 to 5,555 m3/day. This is particularly evident in 2005 when volume decrease was at a maximum ca. 2,000 m3/day. Finally, the infiltration rate decreased from 22.76 to 7.15 m/day. The difference in infiltration rate between 2003
and 2005 has a maximum variation from to 15.2 to 10.33 m/day. In 2003, the addition of sand caused the infiltration rate to
fall to a minimum ca. 5.3 m/day. By extending the recharge time, the infiltration rate fell gradually similar to those identified
from 2005 to 2007. |
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