NDLI: Evaluating the Relative Importance of Groundwater Recharge Sources in a Subtropical Alluvial Plain Using Tracer-Based Ternary End Member Mixing Analysis (EMMA)

Content Provider	Springer Nature Link
Author	Peng, Tsung Ren Huang, Chun Chun Chen, Jui Er Zhan, Wen Jun Chiang, Li Wei Chang, Liang Cheng
Copyright Year	2016
Abstract	In Taiwan’s humid climate, proximal fan groundwater (PFG) is mainly sourced from local precipitation (LP), mountain front recharge (MFR), and mountain block recharge (MBR). This study evaluates the relative importance of the above sources’ respective contributions to the PFG of the Langyang alluvial plain (LAP), northeastern Taiwan. To this end, we first identify stable isotopic characteristics of these target waters and evaluate the hydrological relations among them. Further, we employ ternary end member mixing analysis (EMMA) based on δ $^{18}$O and electrical conductivity to semi-quantitatively calculate contributing fractions and amounts of water for respective LP, MFR, and MBR end members. EMMA results indicate that the respective contribution fractions of LP, MFR, and MBR to PFG at the LAP are approximately 28, 60, and 12 %, respectively. Further, we employ the obtained contribution fractions to understand the corresponding water amounts of each end-member contributed to PFG. In total, 325 × 10$^{6}$ m$^{3}$ of water recharges PFG annually; of which, 226 × 10$^{6}$ m$^{3}$/yr. is from MFR, 76 × 10$^{6}$ m$^{3}$/yr. from LP, and 23 × 10$^{6}$ m$^{3}$/yr. from MBR. MFR is clearly the greatest source of water at the LAP and local water resource management and protection authorities should concentrate their energies on this important contributor to groundwater. To keep these results in context, limitations to the EMMA approach are evaluated in the text.
Starting Page	3861
Ending Page	3878
Page Count	18
File Format	PDF
ISSN	09204741
Journal	Water Resources Management
Volume Number	30
Issue Number	11
e-ISSN	15731650
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-06-17
Publisher Institution	European Water Resources Association (EWRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mountain front recharge (MFR) Mountain block recharge (MBR) End member mixing analysis (EMMA) Groundwater recharge Taiwan Hydrogeology Hydrology/Water Resources Geotechnical Engineering & Applied Earth Sciences Atmospheric Sciences Civil Engineering Environment
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Civil and Structural Engineering

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