Multivariate power-law models for streamflow prediction in the Mekong Basin

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dc.creatorLacombe, Guillaume
dc.creatorDouangsavanh, Somphasith
dc.creatorVogel, R.M.
dc.creatorMcCartney, Matthew P.
dc.creatorChemin, Yann H.
dc.creatorRebelo, Lisa-Maria
dc.creatorSotoukee, Touleelor
dc.date2014-11
dc.date2015-03-17T14:39:57Z
dc.date2015-03-17T14:39:57Z
dc.date.accessioned2026-06-27T18:33:33Z
dc.descriptionStudy region: Increasing demographic pressure and economic development in the Mekong Basin result in greater dependency on river water resources and increased vulnerability to streamflow variations. Study focus: Improved knowledge of flow variability is therefore paramount, especially in remote catchments, rarely gauged, and inhabited by vulnerable populations. We present simple multivariate power-law relationships for estimating streamflow metrics in ungauged areas, from easily obtained catchment characteristics. The relations were derived from weighted least square regression applied to streamflow, climate, soil, geographic, geomorphologic and land-cover characteristics of 65 gauged catchments in the Lower Mekong Basin. Step-wise and best subset regressions were used concurrently to maximize the prediction R-squared computed by leave-one-out cross-validations, thus ensuring parsimonious, yet accurate relationships. New hydrological insights for the region: A combination of 3–6 explanatory variables – chosen among annual rainfall, drainage area, perimeter, elevation, slope, drainage density and latitude – is sufficient to predict a range of flow metrics with a prediction R-squared ranging from 84 to 95%. The inclusion of forest or paddy percentage coverage as an additional explanatory variable led to slight improvements in the predictive power of some of the low-flow models (lowest prediction R-squared = 89%). A physical interpretation of the model structure was possible for most of the resulting relationships. Compared to regional regression models developed in other parts of the world, this new set of equations performs reasonably well.
dc.identifierhttps://hdl.handle.net/10568/58417
dc.identifier.urihttp://hdl.handle.net/123456789/159382
dc.languageen
dc.publisherElsevier
dc.rightsOpen Access
dc.sourceLacombe, Guillaume; Douangsavanh, S.; Vogel, R. M.; McCartney, Matthew; Chemin, Yann; Rebelo, Lisa-Maria; Sotoukee, Touleelor. 2014. Multivariate power-law models for streamflow prediction in the Mekong Basin. Journal of Hydrology: Regional Studies, 2:35-48. doi: https://doi.org/10.1016/j.ejrh.2014.08.002
dc.subjectriver basins
dc.subjectstream flow
dc.subjectwater resources
dc.subjectcatchment areas
dc.subjectrain
dc.subjectdrainage
dc.subjectland cover
dc.subjectmodels
dc.titleMultivariate power-law models for streamflow prediction in the Mekong Basin
dc.typeJournal Article

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Instituto Internacional para el Manejo del Agua (IWMI)