KAJIAN PENGARUH VARIABILITAS HUJAN DALAM MENENTUKAN DEBIT BANJIR RANCANGAN DENGAN METODE HIDROGRAF SATUAN
Unit Hydrograph (UH) is one of methods in the determination of design flood that give accurate result and often be used in the analysis because of its simplicity in the determination process. The UH method assume that rainfall is evenly distributed over the basin. Determination of well distributed c...
| Main Authors: | , |
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| Format: | Thesis |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2011
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| Subjects: |
| _version_ | 1797030371147120640 |
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| author | , Chandra Liman , Ir. Joko Sujono, M.Eng., Ph.D. |
| author_facet | , Chandra Liman , Ir. Joko Sujono, M.Eng., Ph.D. |
| author_sort | , Chandra Liman |
| collection | UGM |
| description | Unit Hydrograph (UH) is one of methods in the determination of design
flood that give accurate result and often be used in the analysis because of its
simplicity in the determination process. The UH method assume that rainfall is
evenly distributed over the basin. Determination of well distributed catchment
rainfall could be done if there are enough precipitation gages that evenly
distributed over the basin. In fact, Indonesia has high rainfall variability and the
precipitation gages are not well distributed. This condition will be worst when
there are only few automatic rainfall recorders (ARR). These conditions are some
obstacles that hamper the hydrological analysis process, especially the
determination of UH.
Research is established in Yogyakarta Special District (DIY) Province
over four river basins i,e. Bedog, Winongo, Code and Gajah Wong. Those four
river basins are chosen based on some consideration, including the availability of
ARR. Analysis is started by determination of rainfall variability of each group
(precipitation gage grouping) and its rainfall distribution. The next step is
calculating the UH deviation and the designed flood hydrograph deviation of
each rainfall input from the standard method (catchment rainfall). The
determination of the most significant group being done by doing some trial from
several rainfall input that give the fewest deviation of UH and design flood.
Result shows that analysis of all the river basins do not indicate certain
deviation pattern in peak discharge (Qp) of both unit hydrograph and flood
hydrograph, so conclusion could not be drawn about which part of river basin
that has highest contribution. For the first scheme, which use �upstream and
downstream� concept of Gama I, the fewest deviation of peak discharge is
happened in downstream group. The second scheme, which use rainfall input
based on rainfall distribution of each ARR, the fewest deviation of peak discharge
(Qp) is happened in the group around the centre gravity of the basin, though the
result is not directly proportional with design flood accuracy of each rainfall input.
The determination of (Qp) using precipitation-runoff transformation analysis
showing that the less deviation is happened in upstream group and when the
rainfall input comes from each precipitation gage the deviation pattern will be
random. This condition is possibly happened because of the use of varied phi
index from each rainfall input and the other possible reason is the influence of
different characteristics of each river basin. |
| first_indexed | 2024-03-13T22:04:40Z |
| format | Thesis |
| id | oai:generic.eprints.org:88649 |
| institution | Universiti Gadjah Mada |
| last_indexed | 2024-03-13T22:04:40Z |
| publishDate | 2011 |
| publisher | [Yogyakarta] : Universitas Gadjah Mada |
| record_format | dspace |
| spelling | oai:generic.eprints.org:886492014-08-20T02:50:44Z https://repository.ugm.ac.id/88649/ KAJIAN PENGARUH VARIABILITAS HUJAN DALAM MENENTUKAN DEBIT BANJIR RANCANGAN DENGAN METODE HIDROGRAF SATUAN , Chandra Liman , Ir. Joko Sujono, M.Eng., Ph.D. ETD Unit Hydrograph (UH) is one of methods in the determination of design flood that give accurate result and often be used in the analysis because of its simplicity in the determination process. The UH method assume that rainfall is evenly distributed over the basin. Determination of well distributed catchment rainfall could be done if there are enough precipitation gages that evenly distributed over the basin. In fact, Indonesia has high rainfall variability and the precipitation gages are not well distributed. This condition will be worst when there are only few automatic rainfall recorders (ARR). These conditions are some obstacles that hamper the hydrological analysis process, especially the determination of UH. Research is established in Yogyakarta Special District (DIY) Province over four river basins i,e. Bedog, Winongo, Code and Gajah Wong. Those four river basins are chosen based on some consideration, including the availability of ARR. Analysis is started by determination of rainfall variability of each group (precipitation gage grouping) and its rainfall distribution. The next step is calculating the UH deviation and the designed flood hydrograph deviation of each rainfall input from the standard method (catchment rainfall). The determination of the most significant group being done by doing some trial from several rainfall input that give the fewest deviation of UH and design flood. Result shows that analysis of all the river basins do not indicate certain deviation pattern in peak discharge (Qp) of both unit hydrograph and flood hydrograph, so conclusion could not be drawn about which part of river basin that has highest contribution. For the first scheme, which use �upstream and downstream� concept of Gama I, the fewest deviation of peak discharge is happened in downstream group. The second scheme, which use rainfall input based on rainfall distribution of each ARR, the fewest deviation of peak discharge (Qp) is happened in the group around the centre gravity of the basin, though the result is not directly proportional with design flood accuracy of each rainfall input. The determination of (Qp) using precipitation-runoff transformation analysis showing that the less deviation is happened in upstream group and when the rainfall input comes from each precipitation gage the deviation pattern will be random. This condition is possibly happened because of the use of varied phi index from each rainfall input and the other possible reason is the influence of different characteristics of each river basin. [Yogyakarta] : Universitas Gadjah Mada 2011 Thesis NonPeerReviewed , Chandra Liman and , Ir. Joko Sujono, M.Eng., Ph.D. (2011) KAJIAN PENGARUH VARIABILITAS HUJAN DALAM MENENTUKAN DEBIT BANJIR RANCANGAN DENGAN METODE HIDROGRAF SATUAN. UNSPECIFIED thesis, UNSPECIFIED. http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=50445 |
| spellingShingle | ETD , Chandra Liman , Ir. Joko Sujono, M.Eng., Ph.D. KAJIAN PENGARUH VARIABILITAS HUJAN DALAM MENENTUKAN DEBIT BANJIR RANCANGAN DENGAN METODE HIDROGRAF SATUAN |
| title | KAJIAN PENGARUH VARIABILITAS HUJAN
DALAM MENENTUKAN DEBIT BANJIR RANCANGAN
DENGAN METODE HIDROGRAF SATUAN |
| title_full | KAJIAN PENGARUH VARIABILITAS HUJAN
DALAM MENENTUKAN DEBIT BANJIR RANCANGAN
DENGAN METODE HIDROGRAF SATUAN |
| title_fullStr | KAJIAN PENGARUH VARIABILITAS HUJAN
DALAM MENENTUKAN DEBIT BANJIR RANCANGAN
DENGAN METODE HIDROGRAF SATUAN |
| title_full_unstemmed | KAJIAN PENGARUH VARIABILITAS HUJAN
DALAM MENENTUKAN DEBIT BANJIR RANCANGAN
DENGAN METODE HIDROGRAF SATUAN |
| title_short | KAJIAN PENGARUH VARIABILITAS HUJAN
DALAM MENENTUKAN DEBIT BANJIR RANCANGAN
DENGAN METODE HIDROGRAF SATUAN |
| title_sort | kajian pengaruh variabilitas hujan dalam menentukan debit banjir rancangan dengan metode hidrograf satuan |
| topic | ETD |
| work_keys_str_mv | AT chandraliman kajianpengaruhvariabilitashujandalammenentukandebitbanjirrancangandenganmetodehidrografsatuan AT irjokosujonomengphd kajianpengaruhvariabilitashujandalammenentukandebitbanjirrancangandenganmetodehidrografsatuan |