59 0

Applicability of topmodel in the catchments of Nopal: Bagmati river basin

Title
Applicability of topmodel in the catchments of Nopal: Bagmati river basin
Author
전병훈
Keywords
TOPMODEL; GIS; DEM; Nash efficiency; hydrograph; River basin
Issue Date
2011-12
Publisher
Unknown
Citation
Geosystem Engineering, 2011, 14(4), P.181~190
Abstract
TOPMODEL was applied to simulate runoff hydrograph in Bagmati River Basin. Digital Elevation Model (DEM), soil, land-use and other spatial data were analyzed using Geographic Information System (GIS). To account for spatial variability of precipitation, climate and land-use, the entire basin was divided into sub-basins and the model was run separately. Other additional computer codes have been developed for computing evapotranspiration and channel routing so as to apply TOPMODEL as a complete hydrological model for medium to large basin. Less sensitive or physically based parameters were directly measured from topographic and soil maps using looked up table, where as more sensitive parameters such as saturated transmissivity [ln(T0)] and exponential decay coefficient (m) to each sub-basin were calibrated by manual iterative method. However, subjective and objective methods were applied to test the goodness of fit of simulated hydro- graphs to observed hydrographs. The results are satisfactory with Nash efficiency as much as 84.8% in calibration and 82.5% in validation. The results showed annual peak, runoff volume, annual average wet and dry seasons flows simulation using the model were relatively reasonable. Most of the river basins of Nepal are steep to moderately steep sloped, densely vegetated and receives appreciable amount of frequent precipitation and hence TOPMODEL assumptions are valid. The limited available resources used to achieve these results showed that TOPMODEL will be applicable in medium to large spring fed catchments of Nepal.
URI
https://www.tandfonline.com/doi/abs/10.1080/12269328.2011.10541349http://hdl.handle.net/20.500.11754/66049
ISSN
2166-3394
DOI
10.1080/12269328.2011.10541349
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE