Estimation of groundwater recharge using the cumulative rainfall departure method for Bac Lieu province, Mekong Delta, Vietnam
Estimation of the groundwater (GW) recharge from rainfall is important for determining GW resources in water resources development and management. GW is currently extensively exploited and is an important source of freshwater for people in the Mekong Delta, Vietnam, especially during dry seasons....
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Дальневосточного отделения Российской академии наук, Южно-Сахалинск, Федеральное государственное бюджетное учреждение науки Институт морской геологии и геофизики
2024-12-01
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| Series: | Геосистемы переходных зон |
| Subjects: | |
| Online Access: | http://journal.imgg.ru/web/full/f2024-4-8.pdf |
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| Summary: | Estimation of the groundwater (GW) recharge from rainfall is important for determining GW resources
in water resources development and management. GW is currently extensively exploited and is an important
source of freshwater for people in the Mekong Delta, Vietnam, especially during dry seasons. To achieve
sustainable utilization of GW resources in the delta, it is essential to determine the annual renewable GW
reserve from the rainfall recharge. The study provides evidence for the application of the cumulative rainfall
departure (CRD) method for the GW recharge estimation for deep aquifers. The monitored rainfall data and
GW levels of the aquifers in Bac Lieu province are used. The results of the analysis by the CRD method show
that the fractions of cumulative rainfall departure for Holocene (qh), Upper Pleistocene (qp3), Middle-Upper
Pleistocene (qp2–3), and Lower Pleistocene (qp1) aquifers are 0.08 %, 0.18 %, 0.55 %, and 0.50 %, respectively,
which only equals 1.31 % of the total rainfall. The Pearson correlation between the observed and model water
levels is high, from 0.898 to 0.925. The total GW annual recharge from the rainfall over the province is estimated
to be 74.07 million m3
, equivalent to 203 000 m3
/ day, i.e., which is 16 % lower than the current water abstraction
of 23 600 m3
/day. The obtained results are important for subsequent comparison with the Red River basin in
northern Vietnam, where it is necessary to keep track of the groundwater inflow along with its volume/resource,
including the inflow from the geothermal system of the rift zone of the Red River. |
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| ISSN: | 2541-8912 2713-2161 |