Spatial Modeling of Sediment Transport over the Upper Citarum Catchment
| Autor: | Poerbandono Poerbandono, Ahmad Basyar, Agung Budi Harto |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Hydrology
erosion rate geography Watershed geography.geographical_feature_category sediment delivery ratio Water flow General Engineering Drainage basin Sediment GIS Engineering (General). Civil engineering (General) sediment yield lcsh:TA1-2040 Environmental science Land use land-use change and forestry WEPP TA1-2040 Digital elevation model lcsh:Engineering (General). Civil engineering (General) Sediment transport Citarum |
| Zdroj: | Journal of Engineering and Technological Sciences, Vol 38, Iss 1 (2014) ITB Journal of Engineering Science, Vol 38, Iss 1, Pp 11-28 (2006) |
| ISSN: | 2338-5502 2337-5779 |
| Popis: | This paper discusses set up of a spatial model applied in Geographic Information System (GIS) environment for predicting annual erosion rate and sediment yield of a watershed. The study area is situated in the Upper Citarum Catchment of West Java. Annual sediment yield is considered as product of erosion rate and sediment delivery ratio to be modelled under similar modeling tool. Sediment delivery ratio is estimated on the basis of sediment resident time. The modeling concept is based on the calculation of water flow velocity through sub-catchment surface, which is controlled by topography, rainfall, soil characteristics and various types of land use. Relating velocity to known distance across digital elevation model, sediment resident time can be estimated. Data from relevance authorities are used. Bearing in mind limited knowledge of some governing factors due to lack of observation, the result has shown the potential of GIS for spatially modeling regional sediment transport. Validation of model result is carried out by evaluating measured and computed total sediment yield at the main outlet. Computed total sediment yields for 1994 and 2001 are found to be 1.96×10 6 and 2.10×10 6 tons/year. They deviate roughly 54 and 8% with respect to those measured in the field. Model response due to land use change observed in 2001 and 1994 is also recognised. Under presumably constant rainfall depth, an increase of overall average annual erosion rate of 11% resulted in an increase of overall average sediment yield of 7%. |
| Databáze: | OpenAIRE |
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