KAJIAN DEBIT PUNCAK DI PULAU TERNATE PROVINSI MALUKU UTARA
The changes of land use in Ternate Island due to the presence of Ternate City in the Island, has led to increase the area that is built up which then have an impact on the reduction of water catchment areas. if it continues then it will contribute to the improvement of the direct flow resulting in i...
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| Main Authors: | , |
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| Format: | Theses and Dissertations NonPeerReviewed |
| Published: |
[Yogyakarta] : Universitas Gadjah Mada
2014
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| Subjects: | |
| Online Access: | https://repository.ugm.ac.id/127563/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=67824 |
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| Institution: | Universitas Gadjah Mada |
| Summary: | The changes of land use in Ternate Island due to the presence of Ternate City in
the Island, has led to increase the area that is built up which then have an impact
on the reduction of water catchment areas. if it continues then it will contribute to
the improvement of the direct flow resulting in increasingly large peak flows in
the river. Therefore we need the data, information and strategies in dealing with
these problems. The objective of this study is to be : (1) estimated peak discharge
at the entire watershed on the island of Ternate. (2) determine the approximate
amount of rainfall can cause flooding at each outlet stream, and (3) review of
flood mitigation strategies based on the design of land use change scenarios.
One of the methods that can be used to measure the magnitude of the peak flows
in a small watersheds it's The Rational Method. This method itself works by three
main parameters: (1) Runoff Coefficient, (2) Watershed Area, and (3) Intensity of
Rainfall. Calculation results obtained from these methods, then be validated by
using the Manning equation. This equation is done at each watershed outlet where
the parameters are measured and observed left-right width and height of the river
embankment, slope and surface roughness values of the river.
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Based on the results of the processing of the Rational Method and Manning
Equation, obtained each return period either 2, 5, 10, 20 and 25 years, watersheds
that have the smallest peak discharge is Sulamadaha II and which has the greatest
peak discharge is Takoma. The magnitude of the difference peak discharge using
the rational method, is determined by the physical characteristics of a vast
watersheds and land uses of each watersheds, whereas the characteristics of rain
precipitation has no effect because the calculation process is done, the value is
considered equal for all watersheds. However, in determining the intensity of rain
each watershed differ due to differences in the concentration time (tc) of each
watershed . Then within a period of 25 years, all watersheds in the island of
Ternate is still relatively safe from flooding if the only contributing factor due to
the rain. From 31 watersheds in the island of Ternate, 4 watersheds classified or
potentially flood-prone watersheds that Huda, Sangaji, Tobelou and Tobololo II. |
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