Abstract
Abstract. To investigate the agricultural land-use change on flood regime, the upper Huaihe River basin above the Dapoling station was selected as the case study site. Based on topography, land-use, hydrological and meteorological data in 1990s and 2010s, the improved distributed Xinanjiang model, with potential evapotranspiration being computed by coupling a dual-source evapotranspiration model with a simplified plant growth model, was adopted to simulate the daily and hourly rainfall-runoff processes over 1990s and 2010s, and then the effects of land-use change on flood volume, flood peak, occurring time of flood peak, the percentage of surface runoff component were investigated respectively. The results was interesting and indicated that impacts of land-use change on flood characteristics varied significantly with land-use types. The outputs could provide valuable references for flood risk management and water resources management in the Huaihe River basin.
Highlights
In the last decades many inundations have occurred in China causing huge loss of human lives and financial damages, which have been aggravated by the intense urbanization and deforestation of flood prone areas.The impact of land use changes on storm runoff generation is currently receiving considerable public attention
To investigate the agricultural land-use change on flood regime, the upper Huaihe River basin, with a history of flooding over many centuries, above the Dapoling station was selected as the case study site, where the land-use was dominated by the agricultural land-use and it changed significantly in recent decades (Cai et al, 2012)
This paper aims to evaluate impacts of landuse change in the upper Huaihe river basin above Dapoling gauge station on its floods
Summary
In the last decades many inundations have occurred in China causing huge loss of human lives and financial damages, which have been aggravated by the intense urbanization and deforestation of flood prone areas.The impact of land use changes on storm runoff generation is currently receiving considerable public attention. It is recognized that there is an impact of land use on hydrology and flood response, the links between land use change and flooding are still not very clear. Land-use, hydrological and meteorological data in 1990s and 2010s, the gridded Xinanjiang model (XAJ) was adopted to simulate the flood processes under different land-use patterns. An improved gridded XAJ model was selected for the hydrological process simulation. The distributed dualsource evapotranspiration model (DESM), considering the soil potential evaporation, vegetation potential evaporation, and evaporation of intercepted rainfall together was adopted to calculate the evapotranspiration as one of the inputs of the gridded XAJ model. One of the important input - leaf area index (LAI) of the DSEM, was often estimated by using remotely sensed data on a monthly scale, which
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