Alpha Modeling of Nakayasu Synthetic Unit Hydrograph for Part of Watersheds in Indonesia
Dian Kamila1, Lily Montarcih Limantara2, Mohammad Bisri3, Widandi Soetopo4
1Dian Kamila, Doctoral Program on the Department of Water Resources, Faculty of Engineering, University of Brawijaya, Indonesia.
2Lily Montarcih Limantara*, Department of Water Resources, Faculty of Engineering, University of Brawijaya, Indonesia.
3Mohammad Bisri, Department of Water Resources, Faculty of Engineering, University of Brawijaya, Indonesia.
4Widandi Soetopo, Department of Water Resources, Faculty of Engineering, University of Brawijaya, Indonesia.
Manuscript received on November 12, 2019. | Revised Manuscript received on November 25, 2019. | Manuscript published on 30 November, 2019. | PP: 5509-5514 | Volume-8 Issue-4, November 2019. | Retrieval Number: D8972118419/2019©BEIESP | DOI: 10.35940/ijrte.D8972.118419
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The lacks of hydrograph data in the field has become the drawback of the hydraulic structure planning. However, such a conditional deficiency in particular, has urgently placed the Synthetic Unit Hydrograph (SUH) models to be very great utility. The Synthetic Unit Hydrograph (SUH) is a popular model that is used in many water resources designs especially in design flood analysis in ungagged watershed. One of the SUH that is usually used in Indonesia is Nakayasu SUH. This model is depended on the α parameter that is influencing the unit hydrograph ordinate and time base. This research intends to build a model of α parameter that is as the characteristic factor of part of watersheds in Indonesia. The methodology consists of observed unit hydrograph analysis for obtaining the α parameter in each watershed, to collect the characteristic data in each watershed, and then to formulate the α parameter model that is as the function of watershed characteristic. The result is formulation model of α that can be used to analyze the design flood in the watershed in Indonesia.
Keywords: Nakayasu SUH, Alpha (Α), Design Flood, Watershed Characteristic Factor.
Scope of the Article: Network Traffic Characterization and Measurements.