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ITS » Master Theses » Manajemen & Rekayasa Sumber Air S2
Posted by fandikaaqsa@its.ac.id at 26/02/2016 09:54:38  •  635 Views


PERMODELAN HUJAN DEBIT PADA DAERAH ALIRAN SUNGAI BENGAWAN SOLO DENGAN DISTRIBUTED MODEL MENGGUNAKAN INTEGRATED FLOOD ANALYSIS SYSTEM IFAS

RAINFALL-RUNOFF MODELLING OF BENGAWAN SOLO CATCHMENT AREA WITH DISTRIBUTED MODEL USING INTEGRATED FLOOD ANALYSIS SYSTEM IFAS

Author :
ASTUTI, HARY PUJI ( 3112205901 )




ABSTRAK

Sebuah peramalan banjir melalui data-data curah hujan ataupun debit masih belum bisa diterapkan secara optimal di seluruh wilayah Indonesia. Hal ini disebabkan terkendalanya ketersediaan alat sehingga data menjadi tidak lengkap. Sehingga diperlukan sebuah permodelan untuk menentukan besarnya debit runoff pada sebuah daerah aliran sungai DAS. Seiring dengan perkembangan teknologi citra satelit berkembang pula teknologi Sistem Informasi Geografis SIG beserta aplikasinya. Sebuah program untuk membuat permodelan hidrologi dengan konsep distributed model dan tank model disebut Integrated Flood Analysis System IFAS. Pada studi ini dilakukan permodelan hujan debit pada DAS Bengawan Solo. Tujuan dari permodelan ini untuk mendapatkan performa permodelan IFAS bila dibandingkan dengan hasil pengukuran lapangan. Adapun perumusan masalah yang diangkat dalam studi ini adalah bagaimana memodelkan DAS Bengawan Solo pada IFAS kalibrasi nilai parameter antara surface subsurface aquifer dan river course yang berpengaruh siginifikan terhadap model. Kemudian mencari performa model berdasarkan perbandingan debit AWLR DAS Bengawan Solo menggunakan metode Root Mean Square Error RMSE Nash dan Volume Error VE. Permodelan DAS pada IFAS dibuat dalam 5 model default dan model 1 2 3 4 dimana masing-masing memiliki nilai parameter yang berbeda. Penentuan nilai parameter ini berdasarkan analisa pengaruhnya terhadap perubahan bentuk gelombang model. Perubahan nilai parameter memberikan dampak terhadap pembentukan gelombang hidrograf. Berdasarkan hasil simulasi model dan tiga uji performa model didapatkan model dengan keandalan optimum yaitu model 4. Model 4 memiliki nilai RMSE 3.097 Nash 0.955 dan VE 0.0000442. Model 4 telah memenuhi syarat dikatakan sebagai model teroptimum karena tidak melebihi atau mendekati batas uji RMSE mendekati nol Nash mendekati satu dan VE 5. Dengan ketiga nilai tersebut membawa nilai parameter pada model 4 dilakukan validasi pada titik lokasi yang sama tetapi dengan periode yang berbeda. Validasi model pada periode berbeda menghasilkan uji performa yang tak sebaik dengan nilai sebelumnya. Akan tetapi nilai tersebut masih memenuhi kriteria. Validasi model menghasilkan nilai uji RMSE 6.88 Nash 1.106 dan VE 028.


ABSTRACT

A flood forecasting by rainfall data or discharge has not been implied well in most of areas in Indonesia. It is caused by the existence of equipment so data will be uncompleted. Needed a modeling is to know runoff on each catchment area. Along with the development of satellite technology there is technology named Geographic Information System GIS which come with its application and program. A program is to make hydrology modeling using distributed and tank model called Integrated Flood Analysis System IFAS. In this case model will be made for Bengawan Solo Catchment Area. The purpose of model is to know how big the goodness of IFAS modeling when it will compare with measurement data. The main problem of this case is how to make model of Bengawan Solo catchment area in IFAS parameter calibration of surface subsurface aquifer and river course. Next it will find the best model according to discharge from AWLR Automatic Water Level Recording of Bengawan Solo using three types of test Root Mean Square Error RMSE Nash and Volume Error VE. Watershed model of IFAS will be made in five types default 1 2 3 and 4 which each model will have different rate of parameter. Determination of parameter is taken by analysis of impact of each parameter to the graph shape. Changes of parameter will impact to the hydrograph. According to simulation model and three tests before the best model is model 4. Model 4 has RMSE 3.097 Nash 0.955 and VE 0.0000442. This model said as the best is under the limit of RMSE gain to zero Nash gain to one and VE under 5. Using three tests before parameter of model 4 will be validated to the same location but different period. Validation of model in different period will result performance which is not as good as before. In other hand the value of test is still under the edge. This model has rate value for RMSE 6.88 Nash 1.106 and VE 0.28.



KeywordsDAS Bengawan Solo; Debit; Hujan; IFAS; Permodelan; Satelit
 
Subject:  Rekayasa sumber air
Contributor
  1. Dr. techn Umboro Lasminto, S.T., M.Sc
Date Create: 26/02/2016
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Master-31103150001220
Collection ID: 31103150001220
Call Number: RTS 551.48 Ast p


Source
Master Theses of Civil Engineering, RTS 551.48 Ast p, 2014

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Copyright @2016 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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  1.  ITS-Master-40397-3112205901-abstract_id.pdf - 260 KB
  2.  ITS-Master-40397-3112205901-abstract_en.pdf - 434 KB
  3.  ITS-Master-40397-3112205901-conclusion.pdf - 267 KB




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