Investigating the Impact of Land Use Changes on Groundwater Recharge Using Raster Based Geographic Information System

• Main Authors: Liu,Hsiao-Yun, 劉曉芸
• Other Authors: Liang,Cheng Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/98naje

碩士 === 國立交通大學 === 土木工程系所 === 104 === The groundwater, providing fresh water for 1/3 of total water demand in Taiwan, is an important fresh water resource. Proper management is critical for sustainable use of the groundwater. Simulation models have been intensively used for the water resources evaluation. One of the most important factor is the groundwater recharge volume. This study uses python to develop a groundwater recharge evaluation platform which combines PCRaster software with raster-type data of land use, soil information, rainfall, etc. This platform is applied to estimate the groundwater recharge in Pingtung plain and study the influence of the land use associated with the groundwater recharge. The area of Pingtung plain is about 1234.26 km2. The annual groundwater recharge is between 1.2 and 2.0 billion tons of water during the period of 1999 through 2010. The average annual groundwater recharge is 1.7 billion tons with in the period. The annual precipitation in the period is 2415 mm. Accordingly, the recharge rate is about 57% in Pingtung plain. This study analyzes the relationship between the groundwater recharge and the land use. The result shows that 0.2 billion tons reduction of annual groundwater recharge if 10% of permeable land turns into impermeable. This result indicates significant impact on groundwater recharge associated with land use in Pingtung plain.