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Simon Fraser University (2011)

An integrated approach to estimating groundwater recharge and storage variability in southern Mali, Africa

Henry, Chris M

Titre : An integrated approach to estimating groundwater recharge and storage variability in southern Mali, Africa

Auteur : Henry, Chris M

Université de soutenance : Simon Fraser University

Grade : Master of Science 2011

Résumé
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. 18O and 2H concentrations in groundwater and precipitation indicate July-September rainfall as the recharge source.

Mots Clés  : Groundwater recharge Groundwater storage GRACE satellite Isotopes HELP modeling Mali Africa

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Page publiée le 23 juin 2013, mise à jour le 31 janvier 2018