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Groundwater contribution to streamflow sustains biodiversity and enhances ecosystem services, especially under monsoon-driven climate where stream baseflow is often the only available water resource during the dry season. We assessed how land use change influences streamflow and its groundwater c...


Ribolzi, OlivierLacombe, GuillaumePierret, A.Robain, H.Sounyafong, P.Rouw, Anneke deSoulileuth, B.Mouche, E.Huon, S.Silvera, N.Latxachak, K.O.Sengtaheuanghoung, OlothValentin, C.[Interacting land use and soil surface dynamics control groundwater outflow in a montane catchment of the lower Mekong basin]Interacting land use and soil surface dynamics control groundwater outflow in a montane catchment of the lower Mekong basin

Study region : In this study, 33 catchments across the Lower Mekong Basin in Southeast Asia are examined to detect historical changes in their hydrological response via a model-based methodology. Study focus : Intensive development over the past half century across Southeast Asia’s Lower Mekong B...


Lyon, S.W.King, K.Polpanich, O.Lacombe, Guillaume[Assessing hydrologic changes across the Lower Mekong Basin]Assessing hydrologic changes across the Lower Mekong Basin

Hydropower and irrigation developments to address rising demand for food and energy are modifying the water balance of the Mekong Basin. Infrastructure investment decisions are also frequently made from a sub-catchment perspective. This paper compares river flows with irrigation development stage...


Lacombe, GuillaumeDouangsavanh, SomphasithBaker, J.Hoanh, Chu ThaiBartlett, R.Jeuland, M.Phongpachith, C.[Are hydropower and irrigation development complements or substitutes?: the example of the Nam Ngum River in the Mekong Basin]Are hydropower and irrigation development complements or substitutes?: the example of the Nam Ngum River in the Mekong Basin

In Montane Southeast Asia, deforestation and unsuitable combinations of crops and agricultural practices degrade soils at an unprecedented rate. Typically, smallholder farmers gain income from “available” land by replacing fallow or secondary forest by perennial crops. We aimed to understand how ...


Lacombe, GuillaumeValentin, ChristianSounyafong, P.Rouw, Anneke deSoulileuth, B.Silvera, N.Pierret, A.Sengtaheuanghoung, OlothRibolzi, Olivier[Linking crop structure, throughfall, soil surface conditions, runoff and soil detachment: 10 land uses analyzed in northern Laos]Linking crop structure, throughfall, soil surface conditions, runoff and soil detachment: 10 land uses analyzed in northern Laos

Groundwater recharge remains almost totally unknown across the Mekong River Basin, hindering the evaluation of groundwater potential for irrigation. A regional regression model was developed to map groundwater recharge across the Lower Mekong Basin where agricultural water demand is increasing, e...


Lacombe, GuillaumeDouangsavanh, SomphasithVongphachanh, S.Pavelic, Paul[Regional assessment of groundwater recharge in the lower Mekong Basin]Regional assessment of groundwater recharge in the lower Mekong Basin

Climate vagaries and the lack of irrigation, frequently combined with coarse-textured sandy and unevenly distributed saline soils, explain low crop yields and the endemic relative poverty of the rural population in Northeast Thailand (NET). Local and regional trends in agriculturally-relevant rai...


Lacombe, GuillaumePolthanee, AnanTrébuil, Guy[Long-term change in rainfall distribution in Northeast Thailand: will cropping systems be able to adapt?]Long-term change in rainfall distribution in Northeast Thailand: will cropping systems be able to adapt?

Regional and local trends in rainfall intensity, frequency, seasonality, and extremes were analyzed in the central Mekong Basin in continental Southeast Asia over the period 1953-2004 using the modified Mann-Kendall test, accounting for long-term persistence and the regional average of the Kendal...


Lacombe, GuillaumeSmakhtin, Vladimir U.Hoanh, Chu Thai[Wetting tendency in the Central Mekong Basin consistent with climate change-induced atmospheric disturbances already observed in East Asia]Wetting tendency in the Central Mekong Basin consistent with climate change-induced atmospheric disturbances already observed in East Asia

The humid tropics are exposed to an unprecedented modernization of agriculture involving rapid and highly-mixed land-use changes with contrasted environmental impacts. Afforestation is often mentioned as an unambiguous solution for restoring ecosystem services and enhancing biodiversity. One cons...


Lacombe, GuillaumeRibolzi, OlivierRouw, Anneke dePierret, AlainLatsachak, K.Silvera, N.Pham Dinh, R.Orange, D.Janeau, Jean L.Soulileuth, B.Robain, H.Taccoen, A.Sengphaathith, P.Mouche, E.Sengtaheuanghoung, OlothTran Duc, T.Valentin, Christian[Afforestation by natural regeneration or by tree planting: examples of opposite hydrological impacts evidenced by long-term field monitoring in the humid tropics]Afforestation by natural regeneration or by tree planting: examples of opposite hydrological impacts evidenced by long-term field monitoring in the humid tropics

The subject of change detection in climate time series has recently received greater interest as the perception of a human-induced change in the climate is now widely accepted. However, changes in regional precipitation and temperature remain uncertain. This study characterizes projected fine-sca...


Lacombe, GuillaumeHoanh, Chu ThaiSmakhtin, Vladimir U.[Multi-year variability or unidirectional trends?: mapping long-term precipitation and temperature changes in continental Southeast Asia using PRECIS regional climate model]Multi-year variability or unidirectional trends?: mapping long-term precipitation and temperature changes in continental Southeast Asia using PRECIS regional climate model

Trends in rainfall series were investigated at 16 stations in Ghana over the period 1960-2005. Time series were first de-correlated using an effective pre-whitening methodology and then submitted to the resampling-based Mann-Kendall test. Field significances were assessed using the regional avera...


Lacombe, GuillaumeMcCartney, Matthew P.Forkuor, Gerald[Drying climate in Ghana over the period 1960-2005: evidence from the resampling-based Mann-Kendall test at local and regional levels.]Drying climate in Ghana over the period 1960-2005: evidence from the resampling-based Mann-Kendall test at local and regional levels.

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