Application of a Macro Grid Based Hydrological Model to the Huaihe River Basin in China

Abstract

A macro scale grid based distributed hydrological model is applied to the Huaihe River basin in China (140,000km2). In the modeling, a watershed basin is subdivided into grid boxes according to a grid system of a meso-scale atmospheric model to incorporate atmospheric model outputs. Model parameters are determined by using the data sets obtained in the Shigan River basin during the intensive observation period in 1998. Some runoff simulations showed that channel routing has dominant effect on a simulation of river discharge for a large river basin. KeyWords :large river basin, the Huaihe River basin, macro-scale hydrological model Table 1 Historical floods in the Huaihe River basin (Qp, peak discharge(m3/sec)). Table 1. 15, 1998). Table 3 Parameter values of lower part of dams. Fig. 12 Comparison between observed and simulated hydrograph at the outlet of the Shigan River basin. In this case, the amounts of dam releases from two dams are multiplied by 0.2 to consider the effect of water taken to the outside of the basin (from May 1 to Sep. 15, 1998).

Input data resolution analysis for distributed hydrological modeling

“…Topographic maps were used to identify similar regions before the calibrated parameters were assigned. The details of the calibration process are described by Tachikawa et al (2001).…”

Effects of Forcing Data Resolution in River Discharge Simulation

“…Basin and sub-basins of Huaihe River in China are taken as the case to study. Grid precipitation and actual evapo-transpiration data are referred from (1) HUBEX IOP EEWB data with 5-minute spatial and 1 hour temporal resolution, (2) GAME Reanalysis data (Version 1.1) with 1.25-degree spatial and 6 hour temporal resolution and (3) GAME Reanalysis data (Version 1.1) with 2.5-degree spatial and 6 hour temporal resolution for the period from May1, 1998 to August 31, 1998. The effects of data interpolation in distributed hydrologic simulation are also presented.…”