Analisis Rasionalisasi Jaringan Pos Hujan Untuk Kalibrasi Hidrograf Pada DAS Babak Kabupaten Lombok Tengah.

Ranesa, LaluSigarCanggih (2015) Analisis Rasionalisasi Jaringan Pos Hujan Untuk Kalibrasi Hidrograf Pada DAS Babak Kabupaten Lombok Tengah. Magister thesis, Universitas Brawijaya.

Abstract

DAS Babak adalah salah satu DAS besar di Lombok dengan luas DAS ±259,166 km2. DAS Babak dipengaruhi oleh 6 stasiun hujan yang tersebar di dalam dan diluar DAS. Dari hasil pengkajian dan analisis menggunakan standar WMO (World Meteorological Organization) untuk daerah pegunungan daerah tropis adalah 100-250 km2/stasiunterdapat dua stasiun yang belum memenuhi standar kerapatan pos hujan yang disarankan menurut WMO yaitu stasiun hujan Keru dan stasiun Hujan Jurang Sate yang masing-masing memiliki luas pengaruh ±60 km2, dan dari hasil pengkajian dan analisa menggunakan metode Kagan- Rodda diperoleh 2 stasiun terpilih, sedangkan metode Kriging diperoleh hasil 3 buah stasiun terpilih dengan satu perletakan baru dalam DAS Babak. Perhitungan kesalahan relatif curah hujan rancangan untuk metode Kagan- Rodda dalam berbagai kala ulang antara 2,36%-18,60% dan metode Kriging antara 7,90% - 13,57%. Hasil kalibrasi hidrograf satuan pengamatan metode Collins dan hidrograf satuan sintetis Nakayasu menghasilkan nilai α untuk DAS Babak sebesar 1,27, dari hasil kalibrasi diperoleh kesalahan relatif banjir rancangan Nakayasu Metode Kagan-Rodda dalam berbagai kala ulang antara 0,35%-18,21% dan metode Kriging antara 8,90% - 13,04%.

English Abstract

Babak watershed is one of major watersheds in Lombok with ±259.166km2 watershed area. Babak watershed is affected by 6 rainfall stations spread inside and outside watershed. By using standard of WMO (World Meteorological Organization) for mountainous area with range of 100- 250km2/station for tropics, assessment and analysis have been made and shown that two stations which did not fit WMO standards of rain heading density. For example Keru and Jurang Sate Rainfall station, each of station has an area of influence ±60km2. Fur rmore, from assessment and analysis using Kagan-Rodda method, re were two selected stations. While using Kriging method, re were three stations that have been chosen with one new placement inside Babak watershed. Relative error of design rainfall for Kagan-Rodda method was between 2.36%-18.60% for every return period; whilst for Kriging method was between 7.90%-13.57%. Hydrograph calibration result of Collins observation unit and Nakayasu syn tic unit rendered in α value of 1.27 for Babak watershed; relative error for Nakayasu design flood of Kagan-Rodda method for every return period was between 0.35% -18.21% while Kriging method was between 8.90% - 13.04%.

Item Type: Thesis (Magister)
Identification Number: TES/627/RAN/a/2015/041501333
Subjects: 600 Technology (Applied sciences) > 627 Hydraulic engineering
Divisions: S2/S3 > Magister Teknik Pengairan, Fakultas Teknik
Depositing User: Endang Susworini
Date Deposited: 23 Jun 2015 09:23
Last Modified: 23 Jun 2015 09:23
URI: http://repository.ub.ac.id/id/eprint/158857
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