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Soni Senjaya Efendi
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Civil Engineering, Building, Construction & Architecture Engineering

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THE EFFECT OF GROIN MODIFICATION TO SHORELINE CHANGE IN SANUR BALI Soni Senjaya Efendi
JURNAL TEKNIK HIDRAULIK Vol 7, No 1 (2016): JURNAL TEKNIK HIDRAULIK
Publisher : Pusat Litbang Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (751.761 KB) | DOI: 10.32679/jth.v7i1.559

Abstract

Coastlines formed by beach filling and groin constructions in Sanur Beach have undergone changes for years. Erosion and loose of sand after beach filling still occur. Therefore, it is a need for evaluation of coastal structure performance. The methodology to be used in this study is by comparing coastline from numerical model with the result of measurement from year 2012. For declined coastline in area between groins, the treatment is done with shape modification of existing groin and addition of new coastal structure. There are three areas among groins that needed special treatment, GN.4 G7, G39 GA2, and G32 G37, which are identified by the model that has been calibrated with measurement data. Those three segments have greater coastline set back than others. In those three segments, the groins will be modified and new structure will be constructed. In GN.4 G7, a breakwater parallel with coastline will be added in the middle area between groins and the groin structure at GN4 will be modified from T shape to I shape. Groin GA2 will be straightened and new groin parallel with coastline will be constructed in between area G39 GA2. Meanwhile for G32 G37 segment, breakwater parallel with coastline will be added in the both sides of groin G32. From the model output, groin modification and addition of new structure make the coastlines setback decrease from 6,15 meter to 5,34 meter in GN4, from 3,4 meter to 2,85 meter in GA2, and from 3,69 meter to 2,98 meter in G32.
EVOLUSI PERUBAHAN GARIS PANTAI SETELAH PEMASANGAN BANGUNAN PANTAI Soni Senjaya Efendi; IG. B. Sila Dharma; I Ketut Suputra
JURNAL SPEKTRAN Vol. 3, No. 1, Januari 2015
Publisher : Master of Civil Engineering Program Study, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (884.797 KB) | DOI: 10.24843/SPEKTRAN.2015.v03.i01.p08

Abstract

Abstract :Reducing the negative effect of erosion problem efforts either by hard structure (e.g. groin construction) or soft structure (e.g. Sand nourishment) solution have been already implemented. One of the location with sand nourishment solution as well as the groin construction is located in Sanur beach, Bali. This location is in critical situation, where the infrastructure is threatened by the lack of the sediment amount and hence it will be impact on the tourism. The evaluation of the coast line changing impact due to the existing of coastal structure need to be assessed. In the worst case, where the coastline changes significantly, the efforts to solve the erosion problems are by groin shape modification and adding the new coastal structure. Simulation results show that there are three segment of the coastal area in between the groin need to be overcome, GN.4 – G7, G39 – GA2 and G32 – G37. The methodology in this study is by comparing the simulation result with the measurement data in 2012.  The evolution of coastline changing in those areas shows significant coastal recesion compare to the other places. What can be done to solve the problem is that by modifying and construct new structure. In GN.4 – G.7, we can construct breakwater paralel to the coastline in the middle. In GN 4, transforming the groin shape from T to I, in the location of G39 – GA2 we propose to omit the bending of the groin in GA2 and construct the groin parallel to the beach in between G39-GA2, in the location of G32 - G37 the breakwaters need to be constructed in the right side and in the left side of the groin G32. The modification of groin construction in the GN.4 – G7, G39 – GA2, and G32 – G37 reduces the losing of material. The coastal recession can be reduced from 6.15 m to 5.34 m in GN.4, in GA 2 from 3.4 m to 2.85 m, and in G32 from 3.69 m to 2.98 m.
Co-Authors I Gusti Bagus Sila Dharma I Ketut Suputra