ANALYSIS OF LAND USE EFFECT ON SEDIMENTATION WITH QSWAT MODEL CASE STUDY: CIKAO RIVER, PURWAKARTA
There is a change in land use extreme Citarum Hulu for 1994 and 2001, in the southern part of West Java (around Citarum river upstream) in the form of conversion of forest into open land (bush, shrub or dry land). Conversion of forest to open with an area that has significant spatial impact are in t...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/28731 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | There is a change in land use extreme Citarum Hulu for 1994 and 2001, in the southern part of West Java (around Citarum river upstream) in the form of conversion of forest into open land (bush, shrub or dry land). Conversion of forest to open with an area that has significant spatial impact are in the region led to an increase in the rate of annual exports exceeding sediment 100 ton/km2. This causes the buildup of sediment will decrease streamflow and sediment that is potentially higher in reducing the capacity of the river tamping rainwater great intensity, especially during the rainy season. From this sedimentation problem, it takes the model to predict and describe the symptoms to the DAS system in this area. This study utilized a hydrological model SWAT (Soil and Water Assessment Tool). SWAT is a distributed model that connected with GIS (Geographic Information System) and integrates with DSS (Decision Support System). Located in the Cikao River, Purwakarta, West Java, this research using a few stages to implement such as data collection, watershed delineation, land use definition and soil type, editing model databases, station definitions weather, parameterization and input editing, running models, reading and plotting results, calibrating results and parameters, data analysis. The data used are baseline maps of Cikao watershed, Cikao River maps, rainfall data at nearby weather stations. In existing scenario of 2016, the average value of TSS is 178 mg/l. For scenario 1 with plantation land use, the average TSS result in this model is 183 mg/l. While scenario 2 with forest land use shows an average TSS value of 75 mg/l. In the 3rd scenario, with the addition of 50 m of forest circling around critical areas and rivers, indicates an increase in river quality. The best and most likely scenario, is scenario 4. Adding reservoir to a confluence area between three tributaries, which can reduce the TSS value by 20%, to 142 mg / l. |
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