A new assessment method for comprehensive impact of hydropower development on runoff and sediment changes

Auteur(s) et Affiliation(s)

LIU, X.

Asian International Rivers Center, Yunnan University, Kunming, Chine

Yunnan Bureau of Hydrology and Water resources Management, Kunming, Chine

HE, D.

Asian International Rivers Center, Yunnan University, Kunming, Chine

Description :
In this paper, the Lancang River (Upper Mekong), which has over 25 years of large-scale hydropower development, was chosen as a case study for establishing the affected evaluation indicators system and its regression model of runoff and sediment, determining the indicators weight by the hierarchy analysis method and factor analysis method, and setting up the quantitative evaluation models of indicators affected level based on the marginal efficiency principle. Using these methods and model established, the influence degree of runoff and sediment in the Lancang River from 1986 to 2007 were assessed. The major results show that : the impact of sediment transport change by the cascade development is much higher than that of the runoff change; the change process of runoff and sediment shows a U-shaped pattern, which indicates the balance of sediment change because of the interaction of sediment reduction by Manwan reservoir storage and the increase by the Dachaoshan dam construction.

Type de document :
Article de périodique

Source :
Journal of geographical sciences. Acta geographica sinica, issn : 1009-637X, 2012, vol. 22, n°. 6, p. 1034-1044, nombre de pages : 11, Références bibliographiques : 15 ref.

Date :
2012

Editeur :
Pays édition : Chine

Langue :
Anglais