Characterizing the effect of Urbanization on streamflow by integration of Remote Sensing and GIS in Han River Basin.

Muhammad Jehanzaib, Sabab Ali Shah, Dong-Hyeok Park, Jae Hyun Ahn, Tae-Woong Kim*

*Corresponding author for this work

Research output: Contribution to conferenceAbstractpeer-review

Abstract

Changes in land use due to urbanization have significant impact on hydrological process. Impermeable areas often lead to decrease in infiltration and surface roughness that increase the threat of flash flood by decreasing runoff confluence time. Remote sensing (RS) provides measurements of many variables used in hydrological application as a direct measurement compared to traditional techniques. GIS is also a very powerful tool to extract useful information from digital pixels of remote sensing data. Integration of GIS and RS can be applied to get spatial information in digital form such as land use and soil type which is very useful for identification of land use changes, flood risk zones and flood impacts on inundated areas. Soil Conservation Services Curve Number (SCS-CN) model employs a curve number that is a function of land use and hydrologic soil group. Traditional method of estimating CN for a large watershed includes field surveys, interpretation of aerial photographs which is expensive and very time consuming. The objective of this study is to find the curve number by integration of remote sensing and GIS and to investigate the effect of land use changes on runoff using the CN-Model. In this study, the curve number of Han River basin was estimated using remote sensing and GIS, then, the CN-model was applied to calculate runoff at different periods. It was found that surface runoff increases significantly with the increase in urbanization. Under the same precipitation condition, the net increase in runoff by urbanization was in the order of AMC(I) > AMC(II) > AMC(III), demonstrating that if antecedent soil moisture increases, the land use change will have a smaller effect on runoff.
Original languageEnglish
Publication statusPublished - 22 Aug 2018
Externally publishedYes

Keywords

  • AMC
  • GIS
  • Remote sensing
  • SCS-CN
  • urbanisation

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