Warning Time Analysis of Nasiri River Flash Flood due to Several Possible Natural Dam Break Events

https://doi.org/10.22146/jcef.27241

Andry Putra Styawan(1*), Adam Pamudji Rahardjo(2), Joko Sujono(3)

(1) River Basin Organization Kalimantan I, West Kalimantan
(2) Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(3) Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(*) Corresponding Author

Abstract


Flash flood disasters caused by natural dam break have already occurred several times in Indonesia which contributes so much life loss and material damage. This research was aimed to study threat level on flash food disasters on the possibility of the locations where the natural dam was formed by the landslide on the river cliffs at the watershed. The flash flood in Nasiri River on August 1st, 2012 would be used for the model in this research. Therefore, hydrology and hydraulic simulations would be conducted on the process of natural dam break at specified altitudes which were predicted to occur in five locations along the Nasiri River. Several big rain event data sets that could occur on specified years from the previous studies would be used to obtain rain event with the hydrological model. Natural dam break was modeled with HEC-HMS 4.1. The hydraulic simulation used the dynamic flow model in the HEC-RAS 5.3 software. The natural dam collapse would be approached by considering the event that has existed around the study location, and also the local geological condition. The result showed that for all the natural dam break scenarios, it could be concluded that the storage filling time was in the time range of 2 hours 26 minutes up to 5 minutes. The flood travel time was ranged from 27 minutes to 2 minutes. The available warning time was quite short, which was less than 3 hours; therefore the need of early warning system’s facilities and infrastructure are absolutely necessary as one of mitigation effort for flash flood disaster in Nasiri Village.


Keywords


Natural dam, dam break, flash flood

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References

Anon., 1991. User's Manual Boss Dambrk, USA: Boss Corporation.

Chandrabose, G. & Nair B, T., 2014. Dam Break Analysis using HECRAS with DEM Generated Geometry. International Journal of Scientific & Engineering Research, pp. 313-319.

Chow, V. T., 1997. Open Channel Hydraulics. Edisi keempat ed. Jakarta: Erlangga.

Musthofa, A., 2015. Simulasi Banjir Bandang Untuk Sistem Peringatan Dini dan Peta Bahaya [Flash Flood Simulation for Early Warning System and Hazard Map], Yogyakarta: Master Thesis, Faculty of Engineering, Universitas Gadjah Mada.

Primahessa, A., 2017. Analisa Karakteristik Hujan Penyebab Banjir pada Sistem Peringatan Dini di Sungai dengan Kemiringan Curam [Analysis of Rainfall Characteristics for Early Warning System in Steep Slope Channel], Yogyakarta: Master Thesis, Faculty of Engineering, Universitas Gadjah Mada.

Rachmadan, L., Juwono, P. T. & Asmaranto, R., 2014. Analisa Keruntuhan Bendungan Alam Way Ela Dengan Menggunakan Program Zhong Xing Hy21 [Dam Breach Analysis in Way Ela Case using Zhong Xing Hy21 Program], Malang: Universitas Brawijaya.

Rahardjo, A. P., Sujono, J., Jayadi, R. & Legono, D., 2009. Simulation of a Dam Break Triggered Flood, the Case of Situ Gintung Disaster on March 27, 2009. Yogyakarta, pp. 271-283.

Sanjay, L. D. & Ravindra, A. O., 2012. Dynamic Flood Routing And Unsteady Flow Modelling: A Case Study Of Upper Krishna River. International Journal of Advanced Engineering Technology, III(III), pp. 55-59.

Styawan, A. P., 2017. Studi Kejadian dan Potensi Banjir Bandang oleh Keruntuhan Dam Alam di Nasiri [Case Study and Potential Flash Flood caused by Dam Breach in Nasiri Village], Yogyakarta: Master Thesis, Faculty of Engineering, Universitas Gadjah Mada.



DOI: https://doi.org/10.22146/jcef.27241

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