GIS for the assessment of the groundwater recharge potential zone |
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| Authors: | Hsin-Fu Yeh Cheng-Haw Lee Kuo-Chin Hsu Po-Hsun Chang |
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| Institution: | (1) Department of Resources Engineering, National Cheng Kung University, Tainan, Taiwan;(2) Sustainable Environment Research Center, National Cheng Kung University, Tainan, Taiwan |
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| Abstract: | Water resources in Taiwan are unevenly distributed in spatial and temporal domains. Effectively utilizing the water resources
is an imperative task due to climate change. At present, groundwater contributes 34% of the total annual water supply and
is an important fresh water resource. However, over-exploitation has decreased groundwater availability and has led to land
subsidence. Assessing the potential zone of groundwater recharge is extremely important for the protection of water quality
and the management of groundwater systems. The Chih-Pen Creek basin in eastern Taiwan is examined in this study to assess
its groundwater resources potential. Remote sensing and the geographical information system (GIS) are used to integrate five
contributing factors: lithology, land cover/land use, lineaments, drainage, and slope. The weights of factors contributing
to the groundwater recharge are derived using aerial photos, geology maps, a land use database, and field verification. The
resultant map of the groundwater potential zone demonstrates that the highest recharge potential area is located towards the
downstream regions in the basin because of the high infiltration rates caused by gravelly sand and agricultural land use in
these regions. In contrast, the least effective recharge potential area is in upstream regions due to the low infiltration
of limestone. |
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| Keywords: | Geographical information system Groundwater recharge Chih-Pen Creek basin |
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