: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.
Erosion control in Lake Batur area is community-based directed to maintain lake balance. The aims of this research is: 1) to obtain a community-based erosion control model, 2) to analyze the role of communities in the application of land management models, 3) to analyze other plant species in collaboration with the arrangement model, and 4) to analyze the impact of terraces blooming against sedimentation. This research is field experiments and surveys, and the sampling was conducted by purposive sampling with 64 samples. The socio-economic support data of the community was determined by 180 respondents by cluster sampling. Interviews and questionnaires were conducted through closed questions on a conventional scale. The characteristics of the lake were analyzed statistically and descriptively by using the SPSS tool. Land mapping was conducted by GPS method with GIS device. Prediction of erosion was by using USLE Model, while sedimentation was measured by the Stanford Sediment model. The analysis shows that the increase of settlement is averagely of 115.85%, plantation is 245.50% and the sedimentation level is 1,017,93 m3/year. Conclusions and outcomes were in the form of community-based terracing model that collaborate with elephant grass and vetiveria plants.
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