Abstract
Due to the limitation of data sources, the application of Distributed Hydrological Models (DHMs) using earth observation data to research water resources is necessary. In this study, the BTOPMC (Block-wise use of TOPMODEL) model was applied for 2 basins in the tropical monsoon region. This is the first time that the land cover map of the CCI (Climate Change Initiative Land Cover Team) was prepared for input data instead of IGBP (International Geosphere-Biosphere Programme) land cover map as proposed in the demo version of the BTOPMC model. The calibration and validation results showed that the Nash-Sutcliffe coefficients for daily stream discharge were 77.5% and 68.7% at Cung Son station (Ba basin). The Nash-Sutcliffe coefficients for daily stream discharge were 79.4% and 69.0% at Binh Tuong station (Kone basin), respectively. Because of a stop in measuring the discharge at Binh Tuong station in 2007, this model was applied to simulate discharge during the period of 2008-2015. Furthermore, the effect of land cover on discharge at Cung Son station was considered. The annual discharge in 2010 at Cung Son decreased 8 m3/s in the comparison between two scenarios (land cover of 2000 and 2010). According to this result, it is possible to propose a wide application range of the DHMs model to the tropical monsoon river basins using earth observation data.
Highlights
In Vietnam, there are 2360 rivers with the length of over 10 km, comprising eight large basins with the total area of more than 10,000 km2
The BTOPMC (Block-wise use of TOPMODEL) model was applied for 2 basins in the tropical monsoon region
Because of a stop in measuring the discharge at Binh Tuong station in 2007, this model was applied to simulate discharge during the period of 2008-2015
Summary
In Vietnam, there are 2360 rivers with the length of over 10 km, comprising eight large basins with the total area of more than 10,000 km. In Vietnam, there are 2360 rivers with the length of over 10 km, comprising eight large basins with the total area of more than 10,000 km2 Besides these eight basins, there are 18 internal basins that have areas from 1000 to 10,000 km which are referred to as small basins. There are 18 internal basins that have areas from 1000 to 10,000 km which are referred to as small basins Most of these basins locate in the Central part of Vietnam where the distribution of water resources is very severe with flash floods, inundations in the rainy season and droughts in the dry season. Due to limited data sources (only 70 discharge gauging stations in total), especially for small-ungauged basins, the application of hydrological models using earth observation data for the water balance calculation is of necessity
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