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Impact of Precipitation Variability on Hydrological Processes

Author: HuangQiong
Tutor: RenLiLiang
School: Hohai University
Course: Hydrology and Water Resources
Keywords: Spatial and temporal variability of the precipitation Digital Elevation Model Distributed Hydrological Model Information entropy Uncertainty
CLC: P333
Type: Master's thesis
Year: 2006
Downloads: 398
Quote: 2
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Abstract


Rainfall is the most important part of the hydrological cycle is also one of the largest uncertainties runoff simulation . In this paper , a tributary of the Huaihe River SHIGUANHE River Basin for the study, two aspects of the spatial and temporal distribution of precipitation uncertainty from changes in rainfall Information entropy and precipitation , spatial and temporal resolution . Based on information entropy theory and method , four rainfall stations the Huangnizhuang basin rainfall information entropy analysis, through the best combination of rainfall stations in the region on the independent information and common information between the stations of the comparison . The results show that winter rainfall stations more representative should first take into account the rainfall station network selection ; when the the the rainfall recording time change , the setting of the site selected should also be adjusted accordingly . Application Digital Basin model DEDNM (Digital Elevmion Drainage Network Model) DEM ( Digital Elevation Model ) data preprocessing , and then automatically extract the watershed boundary , to determine the river network , and coupled with Xinanjiang model , create a grid-based conceptual distributed hydrological model , aimed at achieving lumped conceptual model and distributed means combined with each other , more realistic and rainfall - runoff formation process simulation and research . Step - by - step interpolation observations of rainfall stations discrete grid rainfall data , and then the grid rainfall data were gathered and spatial aggregation , combined with the static parameters and dynamic parameters method to study the spatial and temporal scales of rainfall runoff simulation . The simulation results show that : the runoff simulation of rainfall time resolution changes are more sensitive to low rainfall temporal resolution , the runoff simulation accuracy is decreasing ; rainfall time aggregation processing will result in the loss of part of the rainfall information , the flood simulation should be selected higher time resolution precipitation data . In addition, changes in rainfall spatial resolution on runoff simulation results are not significant ; analysis of spatial aggregation of rainfall field characteristics , the results show that the proposed spatial aggregation of precipitation across the method average rainfall is greater than the maximum rainfall intensity position .

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CLC: > Astronomy,Earth Sciences > Geophysics > Hydrological Sciences (water sector physics) > Hydrological analysis and calculation
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