TEMPORAL LAG EFFECTS OF ALLUVIAL SYSTEM UNDER UNSTEADY FLOW CONDITIONS

Arie Setiadi Moerwanto

doi:10.32679/jth.v2i1.241

TEMPORAL LAG EFFECTS OF ALLUVIAL SYSTEM UNDER UNSTEADY FLOW CONDITIONS

Arie Setiadi Moerwanto

Abstract

Analisis perubahan morfologi sungai pada kondisi aliran tidak langgeng menuntut suatu submodel numerik yang dapat secara cermat menyimulasikan kelambanan respons temporal sistem aluvial. Pada kondisi hidrodinamika yang berubah sangat cepat, corak dasar sungai tidak dapat secara serentak merespons perubahan tersebut. Karena corak dasar sungai sangat terkait erat dengan laju angkutan sedimen dasar, maka keberhasilan pemodelan kelambanan temporal sistem aluvial akan meningkatkan ketelitian analisis perkembangan corak dasar sungai, prediksi tinggi muka air, laju angkutan sedimen dasar maupun layang dan pada akhirnya akan meningkatkan ketelitian analisis perubahan morfologi sungai. Tulisan ini membahas secara rinci cara pemodelan numerik efek-efek kelambanan temporal sistem aluvial menggunakan metode elemen hingga termasuk pengujian unjuk kerja model.

Keywords

Kelambanan respon temporal, sistem aluvial, metoda elemen hingga, aliran tidak langgeng, corak dasar sungai.

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References

Bell, Robert G. 1980. Non-equilibrium bedload transport by steady and non-steady flows. University of Canterbury, Christchurch, New Zealand, PhD Thesis.

Bell, R.G. and A.J. Sutherland. 1983. Non equilibrium of bed load transport by steady flow. Journal of Hydraulic Research, IAHR, Vol 109, No. 3, pp. 351-367.

Goodwin, Peter. 1986. Sediment transport in unsteady flows. Report No. UBC/HEL-86/03, Hydraulic Engineering Laboratory, University of California, Berkeley, California, PhD Thesis.

Moerwanto, A.S. 2010. The Spatial Lag Effects of Bed Load Transport under Unsteady Flow Conditions, Jurnal Teknik Hidraulik, Vol. 1 No. 2, Desember 2010, pp. 95-107.

Phillips, B.C. 1984. Spatial and temporal lag effects in bed load sediment transport - Civil Engineering Research Report No. 84-10 - Reprint of PhD Thesis, Department of Civil Engineering, University of Canterbury

Phillips, B. C. and A. J. Sutherland. 1989. Spatial lag effects in bed load sediment transport. Journal of Hydraulic Research, IAHR, Vol. 27, No. 1, pp. 115-133.

Phillips, B. C. and A. J. Sutherland. 1990. Temporal lag effects in bed load sediment transport. Journal of Hydraulic Research, IAHR, Vol. 28, No. 1, pp. 5-23.

Rijn, L.C. van. 1993. Principles of sediment transport in rivers, estuaries and coastal seas. Aqua Publications, Amsterdam.

Yalin, M.S. 1977. On the physical modelling of dunes. Proceedings of XVIIth Congress, IAHR, Baden-Baden, Vol. 1, Paper A4, pp. 25-32.

DOI: https://doi.org/10.32679/jth.v2i1.241