Author(s): Songjun Han; Shaoli Wang; Di Xu

Linked Author(s):

Keywords: Storm runoff; Xinanjiang Model; Agricultural plain; Scale effect

Abstract: In agricultural North Huaihe River Plain with a shallow groundwater table and a dense drainage system, saturation excess surface flow and subsurface flow dominate the storm runoff response. Xinanjiang model was used to simulate fourteen storm runoff events during flood seasons from 1997 to 2008 at a field and a small catchment respectively. It performed well with acceptable Nash-Sutcliffe efficiency index and deterministic coefficient. Total runoff depth and flood peak discharges at the field were lager than that at the small catchment, implying scale effects from the field to catchment. In the field, the calibrated initial soil moisture storage deficit is larger, and the calibrated recession constant of total runoff and the groundwater storage are smaller than these in the catchment. The initial soil moisture storage deficit is the parameter relating the difference of runoff depth at the field and catchment. The recession constant in the route method for routing and the recession constant of the groundwater storage are the key parameters relating the difference of flood peak discharge at the field and catchment. The simulation and analysis based on Xinanjiang model is helpful in understanding the runoff generation processes and the scale effects in agricultural catchment like the study area with shallow groundwater table and dense drainage system.

DOI:

Year: 2013