Regional Assessment of Groundwater Recharge in the Lower Mekong Basin

Lacombe, Guillaume; Douangsavanh, Somphasith; Vongphachanh, Sinxay; Pavelic, Paul

doi:10.3390/hydrology4040060

Cited by 16 publications

(17 citation statements)

References 39 publications

(59 reference statements)

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“…Subsequently maps of the groundwater storage and the aquifer productivity were produced using assumptions of thickness, aquifer properties, and reported yields derived from the database, complemented by global published literature where local data was lacking. The renewability was then discussed using recently published groundwater recharge rates [33]. Each aquifers' groundwater development potential was then described based on these synthetized characteristics ( Figure 2).…”

Section: Groundwater Indicatorsmentioning

confidence: 99%

“…Groundwater recharge is a crucial component to assess the potential of groundwater and its sustainability. Here, the recharge has been evaluated over the whole country using recently published data for Laos [33]. In this paper [33], the authors have identified 65 gauging stations across the LMRB, where daily streamflow data was available and not subject to dam regulations.…”

Section: Aquifer Rechargementioning

confidence: 99%

“…Here, the recharge has been evaluated over the whole country using recently published data for Laos [33]. In this paper [33], the authors have identified 65 gauging stations across the LMRB, where daily streamflow data was available and not subject to dam regulations. Using the local minimum filtering method, baseflow was calculated for the selected sub-basins.…”

Section: Aquifer Rechargementioning

confidence: 99%

“…The Volcanic aquifers cover only 7600 km 2 or 3.4% of Laos, but account for 5.2% of its shallow groundwater storage, representing 23 Mm 3 of water. According to recent estimates [33], the recharge rates for these aquifers are expected to be some of the highest of the country at 750 mm per annum on average. This is partly due to the geomorphologic features of the Bolaven Plateau leading to some of the highest precipitation in the region.…”

Section: Group 1-basement and Bedrockmentioning

confidence: 99%

“…Using this value of specific yield, a storage up to 3975 mm can be expected if considering a 30 m saturated aquifer thickness. The Alluvium recharge rates, according to recent estimates [33], range between 210 mm and 1011 mm. These values, lower than for larger sedimentary aquifers, can be explained by the location of the Alluvium in the lowlands, where lesser precipitation occurs.…”

Section: Group 4-alluvial Sedimentsmentioning

confidence: 99%

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Regional Mapping of Groundwater Resources in Data-Scarce Regions: The Case of Laos

Viossanges¹,

Pavelic²,

Rebelo³

et al. 2017

Hydrology

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This study focuses on Laos, a landlocked nation located in SouthEast Asia with subtropical climate and highly seasonal rainfall distribution. Laos is one of the world's least developed countries, and currently witnesses an unprecedented level of development that is highly reliant on its natural resources, including groundwater. There is currently very limited data and no nationwide assessment of shallow (<30 m) groundwater resources to support sustainable management. This study provides a first step towards addressing this issue by (i) identifying the major aquifer units of the country; (ii) integrating localized data and regional maps into an assessment of the groundwater potential; and (iii) producing quantitative maps of key hydrogeological indicators. Eight aquifer units have been described and evaluated: (i) Basement aquifers, (ii) Volcanic aquifers, (iii) Schists, (iv) Paleozoic sedimentary, (v) Karsts, (vi) Limestones, (vii) Mesozoic sedimentary and (viii) Alluvial sediments. The Mesozoic sandstones and the Alluvial aquifers are the most extensive and productive hydrogeological systems in the country. The Volcanic and Karstic aquifers, although poorly known, might also have important potential. This assessment, along with the maps of quantitative aquifer indicators, provide a significant improvement in both spatial resolution and accuracy compared to previously available information. It will likely support improved management plans and the identification of areas with higher potential for groundwater development.

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Section: Groundwater Indicatorsmentioning

confidence: 99%

Section: Aquifer Rechargementioning

confidence: 99%

Section: Aquifer Rechargementioning

confidence: 99%

Section: Group 1-basement and Bedrockmentioning

confidence: 99%

Section: Group 4-alluvial Sedimentsmentioning

confidence: 99%

See 3 more Smart Citations

Regional Mapping of Groundwater Resources in Data-Scarce Regions: The Case of Laos

Viossanges¹,

Pavelic²,

Rebelo³

et al. 2017

Hydrology

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Spatial and temporal dynamics of suspended particles and E. coli in a complex surface-water and karst groundwater system as a basis for an adapted water protection scheme, northern Vietnam

et al. 2021

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Karst aquifers in subtropical regions are characterized by high variability of water availability and quality due to changes associated with rainy and dry seasons. An additional challenge for water management is the combination of surface-water and karst groundwater systems since high spatiotemporal dynamics cause high variability of water quality. In these cases, adapted protection strategies are required. In this study, a protection approach for the catchment of a river-water diversion point in a rural area in northern Vietnam is developed. The variability of water quality was evaluated by rainy and dry season synoptic surveys of suspended particles and microbial contamination at 49 sites and time series at three sets of paired sites under constant hydraulic conditions. The anthropogenic land-use activities in the catchment were mapped to identify potential contamination sources and to highlight the challenging combination of surface-water and karst groundwater management. The analyzed data indicate differences in water quality between the dry and rainy seasons and a higher influence on water quality from land use than from hydrologic conditions. Furthermore, the results suggest a high risk of contamination resulting from residential areas, agriculture, and livestock farming, and reveal the necessity of implementation of appropriate measures such as restricted farming and the hook-up of buildings to municipal sewage disposal. Finally, the data show that water quality can be improved by adjusting water withdrawals by the time of day. The applied methods can be transferred to other surface-water and karst groundwater systems in similar subtropical environments.

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Variability in groundwater flow and chemistry in the Mekong River alluvial aquifer (Thailand): implications for arsenic and manganese occurrence

et al. 2021

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Regional Assessment of Groundwater Recharge in the Lower Mekong Basin

Cited by 16 publications

References 39 publications

Regional Mapping of Groundwater Resources in Data-Scarce Regions: The Case of Laos

Regional Mapping of Groundwater Resources in Data-Scarce Regions: The Case of Laos

Spatial and temporal dynamics of suspended particles and E. coli in a complex surface-water and karst groundwater system as a basis for an adapted water protection scheme, northern Vietnam

Variability in groundwater flow and chemistry in the Mekong River alluvial aquifer (Thailand): implications for arsenic and manganese occurrence

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