KAJIAN SEDIMENTASI WADUK IR. H. DJUANDA, JATILUHUR, KABUPATEN PURWAKARTA, PROVINSI JAWA BARAT
| Main Authors: | , Dodi Suryanto, , Prof. Dr. Ir. Budi Wignyosukarto, Dip.HE. |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2011
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/88977/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=51415 |
Daftar Isi:
- Based on 2009 echosounding, average sedimentation in reservoir was 20 million m 3 /year (1995 - 2009), larger than initial design that requires a study using other methods for comparison. One of the methods is USLE that calculates erosion in catchment area, and suspended load in outlets of Cirata and Ir.H.Djuanda reservoirs. The objective of this study was to analyze and study the erosion, Sediment Delivery Ratio (SDR) value and reservoir sedimentation in 1997 and 2009, and to study the sediment compactness and the reservoir service life. Calculation of suspended load from the outlet of Cirata and Ir.H.Djuanda reservoirs taken from 1995 to 2000 was carried out by calculating the TDS and TSS values or the concentration of water sample. Erosion was calculated by overlaying the maps of erosivity, soil type, slope class and land-use management to become the map of land unit using the Arc GIS Software. Calculation of erosion for each land unit was carried out using the USLE method in order to obtain annual erosion rate in the catchment area of Ir.H.Djuanda reservoir. The 1997 erosion was compared to 2009 echosounding data in order to obtain the SDR value. The values of erosion and SDR were used to predict the 2009 sedimentation volume and to analyze the compactness and the reservoir service life using the dead storage method. Results of this study showed that based on suspended load from outlets of Cirata and Ir.H.Djuanda reservoirs from1995 to 2009, the reservoir sedimentation average about 0,41 m 3 /year. Based on 1997 and 2009 land-use maps, the erosion values were 8,72 mm/year and 12,71 mm/year, respectively. The SDR values in catchment area of Ir. H. Djuada reservoir were about 0,47. The SDR value 0,47 was used to predict the reservoir sedimentation from land erosion with volume result of 20.533.040 m 3 . Predicted calculation on reservoir sedimentation in 2000 to 2009 from land erosion and outlet Cirata reservoir based on this study was only 24.223.040 m 3 . Having the reservoir classified as type 2 reservoir and based on the analysis of the sediment granule size, it was identified that the sediment materials were 3% sand, 46% silt, and 51% clay, and dry volume weight in the first year was 972,6 kg/m 3 . The reservoir service life calculation using the dead storage method, starting from 2009 (the 45th year), showed that Ir. H. Djuanda reservoir service life was 197 years ahead. Then, sediment control was carried out using vegetative means with 50% success level and additional service life from 18 years to 215 ahead.