scholarly journals Modeling and Investigating the Mechanisms of Groundwater Level Variation in the Jhuoshui River Basin of Central Taiwan

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1554
Author(s):  
Tao Bai ◽  
Wen-Ping Tsai ◽  
Yen-Ming Chiang ◽  
Fi-John Chang ◽  
Wan-Yu Chang ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
River Basin ◽  
Groundwater Level ◽  
Low Permeability ◽  
Mountainous Areas ◽  
Level Variation ◽  
Sustainable Water Resources Management ◽  
Groundwater Level Variation ◽  
Accumulated Rainfall ◽  
Central Taiwan

Due to nonuniform rainfall distribution in Taiwan, groundwater is an important water source in certain areas that lack water storage facilities during periods of drought. Therefore, groundwater recharge is an important issue for sustainable water resources management. The mountainous areas and the alluvial fan areas of the Jhuoshui River basin in Central Taiwan are considered abundant groundwater recharge regions. This study aims to investigate the interactive mechanisms between surface water and groundwater through statistical techniques and estimate groundwater level variations by a combination of artificial intelligence techniques and the Gamma test (GT). The Jhuoshui River basin in Central Taiwan is selected as the study area. The results demonstrate that: (1) More days of accumulated rainfall data are required to affect variable groundwater levels in low-permeability wells or deep wells; (2) effective rainfall thresholds can be properly identified by lower bound screening of accumulated rainfall; (3) daily groundwater level variation can be estimated effectively by artificial neural networks (ANNs); and (4) it is difficult to build efficient models for low-permeability wells, and the accuracy and stability of models is worse in the proximal-fan areas than in the mountainous areas.

scholarly journals Spatiotemporal Variation of the Meteorological and Groundwater Droughts in Central Taiwan

2021 ◽  
Vol 3 ◽  
Author(s):  
Hsin-Fu Yeh
Keyword(s):  
River Basin ◽  
Groundwater Level ◽  
Standardized Precipitation Index ◽  
Extreme Drought ◽  
Water Shortages ◽  
Level Data ◽  
Groundwater Drought ◽  
Central Taiwan ◽  
The Standardized Precipitation Index

In recent years, Taiwan has been facing severe water shortages due to extreme drought. In addition, changes in rainfall patterns have resulted in an increasingly notable drought phenomenon, which affects the management and utilization of water resources. Therefore, this work examines basins in Central Taiwan. Long-term records from 13 rainfall and 17 groundwater stations were selected. The Standardized Precipitation Index (SPI) and Standardized Groundwater Level Index (SGI) were used to analyze the drought characteristics of this region. The rainfall and groundwater level data from basins in Central Taiwan were analyzed in this study. The results show that the year 2015 experienced extreme drought conditions due to a correlation with SPI and SGI signals. In addition, with regard to groundwater drought, more drought events occurred in the Da'an River basin; however, the duration and intensity of these events were relatively low, in contrast to those of the Wu River basin. Finally, the correlation between SPI and SGI was observed to vary in different basins, but a certain degree of correlation was observed in all basins. The results show that drought intensity increases with longer drought durations. Moreover, severe droughts caused by rainfall tend to occur at a greater frequency than those caused by groundwater.

scholarly journals Classification of Groundwater Level Variation Types Near the Excavated Area of the Temporary Gulpocheon Discharge Channel

2014 ◽  
Vol 24 (4) ◽  
pp. 631-641
Author(s):  
Chang-Hoon Kim ◽  
Su-Gon Lee ◽  
Jeong-Sang Hahn ◽  
Nam-Ju Kim ◽  
Byeong-Chu Jeon
Keyword(s):  
Groundwater Level ◽  
Discharge Channel ◽  
Level Variation ◽  
Groundwater Level Variation

scholarly journals Hydrogeological and hydrogeochemical investigation of a Precambrian basement aquifer in Bugesera Region (Burundi)

Afrika Focus ◽  
2012 ◽  
Vol 25 (2) ◽  
Author(s):  
Charles Bakundukize
Keyword(s):  
Drinking Water ◽  
Groundwater Level ◽  
Discharge Rate ◽  
Groundwater Potential ◽  
Hydraulic Parameters ◽  
Precambrian Basement ◽  
Level Fluctuation ◽  
Level Variation ◽  
Groundwater Level Variation ◽  
Geophysical Investigations

This study clearly shows that Bugesera region has genuine groundwater potential which could be circumscribed and tapped in order to provide enough drinking water to the inhabitants of the area. Thus, this study recommends further investigations and measures, including, geophysical investigations coupled to reconnaissance drillings, the installation of a network of piezometers to monitor the groundwater level variation, measurement of the discharge rate and water level fluctuation in the complex of marshlands and lakes, monitoring of groundwater quality and further pumping tests in order to rfine the distribution of hydraulic parameters in the study area. 

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