Assessing Groundwater Level Response to Drought on Zhuoshui River Alluvial Fan Using Standardized Groundwater Index

• Main Authors: Chia-ChiChuang, 莊家棋
• Other Authors: Cheng-Haw Lee
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/6hgca7

碩士 === 國立成功大學 === 資源工程學系 === 106 === Groundwater resources have been well exploited in Zhuoshui River Alluvial Fan area for a long history, and is considered to be a vital source of water supply during dry seasons of each year. Variation in precipitation patterns has caused many extreme events in recent decades as well as impacts on groundwater recharge characteristics owing to global climate change. Further studies of historical groundwater records should be taken to meet the need of better groundwater management strategies for the future. In the present study, Zhuoshui River Alluvial Fan is chosen as study area. Daily groundwater level monitoring records during 2001 and 2016 from 42 stations on this area are investigated in order to assess the overall groundwater level response to natural drought phenomena. Firstly, groundwater level records from each of the stations are analyzed to detect groundwater drought events in short and long time scale using the Standardized Groundwater Index (SGI) method. Two SGI indictor, SGI180 and SGI360, time series are estimated form data composed with daily groundwater level accumulative sum for an accumulation period of 180 days and 360 days separately. Secondly, trend of groundwater level during study period of 42 stations are evaluated with Mann-Kendall test, and an appropriate groundwater management strategy is introduced. Finally, a prediction model is developed for the purpose of estimating future groundwater level condition beforehand. Ershui station and Xin-Min station are chosen to build model and the effectiveness of model are tested.