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Study on the Response of Flood Runoff to Land-use Change

Author: Fang
Tutor: FengPing
School: Tianjin University
Course: Hydrology and Water Resources
Keywords: Land use change Flood Response Hydrological model Afflux and
CLC: TV121
Type: Master's thesis
Year: 2009
Downloads: 93
Quote: 2
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Abstract


Haihe River Basin is one of China's seven major river basins in arid and humid climate of the transition zone, the eastern coastal precipitation least the region. In recent years, it has accelerated the development and use of watershed land: beefing of Reservoir Dredging embankment, reforestation, combined with the irrational land use patterns, land use pattern of significant changes occurred in the river basin scale. Since the nineties, the Haihe River Basin runoff compared to the fifties and sixties was significantly reduced, and the the flood number of times, the flood peak middleweight in varying degrees to reduce or reduce, resulting in a variety of water resources utilization and ecological environment. Therefore, exploration and research has important significance such as land-use change in the watershed flood runoff response. This article as a study area, select the Haihe River Basin Qinghe water system based on land-use change in the runoff model analysis of the characteristics of watershed land use change, measured rainfall runoff data used to establish the model to simulate a typical watershed flood and The flood peak and flood volume variation. For quantitative analysis, the different land cover scenarios watershed runoff depth, peak flow changes, this article constructed based on land-use change in the runoff model. Land resource classification system of the Chinese Academy of Sciences in the model of the basin is divided into five different land use types, considering evaporation and infiltration elements in each land use area, the use of excess infiltration - fills coupling runoff mode Runoff calculated summary of the resulting runoff in the watershed, and Unit Curve and linear reservoir model calculations to the basin outlet cross section, resulting in the flood basin. Model calibration and validation, typical watershed Daqinghe River flood sequence frequency analysis, different return period flood sequence given the model rate and validation. From the simulation results, the basic model structure reflects Rainfall - runoff simulation results can meet the accuracy requirements of research. The applications of the model under different land use conditions to simulate the typical watershed flood, and comparative analysis of the variation of the flood factor. Contrast Qinghe water system typical watershed land use in 1980 and 2000, the analysis by land use changes due to changes in the model parameters; typical watershed simulation model parameters under the conditions of the different periods, focus on the variation of the peak flow and runoff depth a combination of qualitative and quantitative analysis of the flood runoff response to land use change. The simulation results show that of the study watershed land-use conditions in 2000, the peak flow and runoff depth than the 1980 land-use conditions are reduced, but decreases slightly; return period flood reduce the magnitude smaller return period flood decreases the amplitude.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Engineering and hydrology > Run-off
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