Hydrological simulation of a typical basin in central Vietnam under different land use scenarios
Changes in the land use and land cover in the Krong Buk basin had adversely affected the annual water resources in the region and hence, the optimal agricultural and human development of the basin had been hampered. The objective of this study is to apply the public domain semi-distributed rainfa...
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| Format: | Thesis |
| Language: | English |
| Published: |
Universiti Malaysia Sarawak, (UNIMAS)
2004
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| Online Access: | http://ir.unimas.my/id/eprint/12608/1/Pham%20Xuan%20Hoa%20ft.pdf http://ir.unimas.my/id/eprint/12608/ |
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| Summary: | Changes in the land use and land cover in the Krong Buk basin had adversely
affected the annual water resources in the region and hence, the optimal
agricultural and human development of the basin had been hampered. The objective
of this study is to apply the public domain semi-distributed rainfall-runoff model
(HEC-HMS) to predict the impact of changes in the land use and land cover on the
total outflow from the Krong Buk basin due to some particular rainfall events., The
public domain Geo-HMS pre-processor was used as a modelling tool. Input data were
the Digital Elevation Model, land use map, hydrological soil group map, daily
rainfall and flow data. Calibration and validation of the model were carried out both
by choosing the parameter that give the best fit to the model and by means of the
Nash objective function with good results (80%). Subsequently, the model was
applied under two different scenarios. That is the replacement of the mixed area
(which is at the upstream by the forested area due to reforestation) and the
conversion of the forested area to planted crop(which is at the middle part of the
basin into coffee area). Under the former, the flow peak was 19 m3/s and water
volume was 174 mm for the year 1994. In the latter case, there was an increase in
the flow peak by 13.28% and water volume by 13.39%. The study is expected to
assist water use planners, decision-makers and stakeholders to manage better the
available water resources within the Krong Buk basin by predicting the impact of
storm runoff due to the land use in the basin. |
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