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

Lacombe Guillaume, Douangsavanh Somphasith, Vogel Richard M., McCartney Mathhew, 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.

https://doi.org/10.1016/j.ejrh.2014.08.002

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Résumé : Study 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.

Mots-clés Agrovoc : bassin versant, débit, modèle mathématique, analyse de régression, analyse multivariée

Mots-clés géographiques Agrovoc : Mékong, République démocratique populaire lao, Asie du Sud-Est

Mots-clés libres : Streamflow prediction, Ungauged catchment, Multivariate regression models, Mekong

Classification Agris : P10 - Ressources en eau et leur gestion
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 6 (2014-2018) - Sociétés, natures et territoires

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