Journal of Geographical Sciences ›› 2011, Vol. 21 ›› Issue (3): 441-457.doi: 10.1007/s11442-011-0856-3

• Hydrology and Water Environment • Previous Articles     Next Articles

Mapping runoff based on hydro-stochastic approach for the Huaihe River Basin, China

YAN Ziqi1,2, XIA Jun1, Lars GOTTSCHALK3   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Department of Geosciences, University of Oslo, N-0315 Oslo, Norway
  • Received:2010-07-21 Revised:2010-09-20 Online:2011-06-15 Published:2011-06-15
  • Supported by:

    National Basic Research Program of China, No.2010CB428406; Key Project of the National Natural Science Foundation of China, No.40730632

Abstract:

Theoretical difficulties for mapping and for estimating river regime characteristics in a large-scale basin remain because of the nature of the variable under study: river flows are related to a specific area, i.e. the drainage basin, and are hierarchically organized in space through the river network with upstream-downstream dependencies. Another limitation is there are not enough gauge stations in developing countries. This presentation aims at developing the hydro-stochastic approach for producing choropleth maps of average annual runoff and computing mean discharge along the main river network for a large-scale basin. The approach applied to mean annual runoff is based on geostatistical interpolation procedures coupled with water balance and data uncertainty analyses. It is proved by an application in the upstream at Bengbu in the Huaihe River Basin, a typical large-scale basin in China. Hydro-stochasitic approach in a first step interpolates to a regular grid net and in a second step the grid values are integrated along rivers. The interpolation scheme includes a constraint to be able to account for the lateral water balance along the rivers. Grid runoff map with 10 km × 10 km resolution and the discharge map along the river with the 1 km basic length unit are the main results in this study. This kind of statistic approach can be widely used because it avoids the complexity of hydrological models and does not depend on the meteorological data.

Key words: kriging method, hydro-stochastic, runoff, water balance, Huaihe River Basin