TY  - THES
ID  - eprints63191
UR  - http://digilib.unila.ac.id/63191/
A1  - APRIADI, 1824151002 
Y1  - 2022/06/07/
N2  - 
Daerah Aliran Sungai (DAS) Ilahan merupakan salah satu DAS yang berada di 
hulu DAS Sekampung.  Keberadaan DAS Ilahan memberikan peran penting
dalam siklus hidrologi Sub DAS Sekampung Hulu.  Penelitian ini dilakukan untuk
menganalisis karakteristik hidrologi DAS Ilahan yang dilaksanakan bulan AprilJuni

2020.  Metode yang digunakan dengan pemodelan SWAT (Soil Water
Assesment Tools).  Karakteristik hidrologi DAS Ilahan berdasarkan hasil
penelitian adalah koefisien regim aliran (KRA) sebesar 122,73 (sangat tinggi),
dengan debit maksimum 14,74 m³/dtk dan debit minimum 0,12 m³/dtk; nilai
koefisien  aliran tahunan (KAT) sebesar 0,419 (tinggi); surface runoff sebesar
379,30 mm; subsurface runoff sebesar 707,05 mm; baseflow sebesar 348,01 mm;
hasil air (water yield) sebesar 1.401,78 mm; sedimentasi sebesar 2,42 ton/ha dan
erosi sebesar 12,38 ton/ha. Skenario tutupan lahan menggunakan RTK-RHL tahun
2014-2029 seluas 430,57 ha, dengan asumsi mengubah tutupan lahan menjadi
kebun campuran kerapatan tinggi.  Skenario ini hasilnya diprediksi merubah
karakteristik hidrologi DAS Ilahan yaitu KRA menurun menjadi 115,08 (sangat
tinggi) dengan debit maksimum14,04 m³/dtk dan debit minimum 0,12 m³/dtk;
nilai KAT menurun menjadi 0,40 (sedang); surface runoff menurun menjadi
291,12 mm; subsurface runoff meningkat menjadi 759,34 mm; baseflow 
meningkat menjadi 377,86 mm; hasil air (water yield) meningkat menjadi
1.412,93 mm; sedimentasi menurun menjadi 1,94 ton/ha dan erosi menurun
menjadi 9,93 ton/ha. Skenario RTK-RHL menyebabkan karakteristik hidrologi
DAS Ilahan menjadi lebih baik dari kondisi eksisting.  Skenario ini belum
memperbaiki karakteristik hidrologi DAS Ilahan secara optimal, sehingga
direkomendasikan dilakukan pemutakhiran RTK-RHL di DAS Ilahan.
 
Kata kunci :  Baseflow, DAS Ilahan, Erosi, Sedimentasi, Subsurface Runoff,
Surface Runoff, Water yield. 

The Ilahan Watershed (DAS) is one of the watersheds located upstream of the
Sekampung watershed. The existence of the Ilahan watershed plays an important
role in the hydrological cycle of the Sekampung Hulu sub-watershed. This
research was conducted to analyze the hydrological characteristics of the Ilahan
watershed. This research was conducted in April-June 2020. The method used in
this study used SWAT (Soil Water Assessment Tools) modeling. The
hydrological characteristics of the Ilahan watershed based on the research results
are the flow regime coefficient (KRA) of 122.75 (very high), with a maximum
discharge of 14.74 m³/s and a minimum discharge of 0.12 m³/s; annual flow
coefficient (KAT) value of 0.419 (high); surface runoff of 379.30 mm; subsurface
runoff of 707.05 mm; baseflow of 348.01 mm; water yield is 1,401.78 mm;
sedimentation is 2.42 tons/ha and erosion is 12.38 tons/ha. The land cover
scenario using RTK-RHL 2014-2029 covers an area of 430.57 ha, assuming that
the land cover is converted into a high-density mixed plantation. This scenario is
predicted to change the hydrological characteristics of the Ilahan watershed,
namely the KRA decreases to 115.08 (very high) with a maximum discharge of
14.04 m³/s and a minimum discharge of 0.12 m³/s; KAT value decreased to 0.40
(medium); surface runoff decreased to 291.12 mm; subsurface runoff increased to
759.34 mm; baseflow increased to 377.86 mm; water yield increased to 1,412.93 
mm; sedimentation decreased to 1.94 tons/ha and erosion decreased to 9.93
tons/ha. The RTK-RHL scenario causes the hydrological characteristics of the
Ilahan watershed to be better than the existing conditions. However, it has not
improved the hydrological characteristics of the Ilahan watershed optimally,
therefore it is recommended to update the RTK-RHL in the Ilahan watershed.

Keywords:  Baseflow, Erosion, Ilahan Watershed, Sedimentation, Subsurface
Runoff, Surface Runoff, Water yield.
 


PB  - UNIVERSITAS LAMPUNG
M1  - masters
TI  - KARAKTERISTIK HIDROLOGI DAS ILAHAN
MENGGUNAKAN PEMODELAN SWAT (Soil Water Assesment Tools)

AV  - restricted
EP  - 1824151002
ER  -