Author : Chris M. Henry
Publisher :
ISBN 13 :
Total Pages : 1010 pages
Book Rating : 4.:/5 (112 download)
Book Synopsis An Integrated Approach to Estimating Groundwater Recharge and Storage Variability in Southern Mali, Africa by : Chris M. Henry
Download or read book An Integrated Approach to Estimating Groundwater Recharge and Storage Variability in Southern Mali, Africa written by Chris M. Henry and published by . This book was released on 2011 with total page 1010 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater recharge in southern Mali is investigated using a variety of methods. The aquifer system comprises a surficial unconfined aquifer in laterite that is hydraulically connected by vertical fractures through a sedimentary rock layer to a deep fractured semi-confined aquifer. Observed groundwater storage fluctuations from historical water level data correlate with GRACE satellite terrestrial water storage (TWS) variations, with peaks in September and lows in May; however, soil-moisture corrected GRACE data peaked in November due to the GLDAS model poorly predicting the timing of soil-water storage changes. Recharge modeling using HELP gave an average annual net recharge of 132.2 mm (12.6% of rainfall), comparing well with estimates from historical water level (149.1 mm; 16.4%) and GRACE (149.7 mm; 14.8%) data. Major ion chemistry suggests groundwater is fresh (average TDS of 205 mg/L) and rapidly recharged. d18O and d2H concentrations in groundwater and precipitation indicate July-September rainfall as the recharge source.