This research is an extension from a previous study titled modelling the diversion channel at Kalibata-Kebonjati meandering segment in Ciliwung watershed. Based on http://pusatkrisis.kemkes.go.id data, there are five sub districts that were flooded because of the rainfall in 5 February 2018 i.e : Pasar Minggu, Pancoran, Cilandak, Jagakarsa and Tebet. Their flood levels were achieved 300 cm, and the worst disaster happened in Pancoran, at Kebonjati to Kalibata segment in particular. Thus, this segment needs to manage accurately with appropriate structures. Formerly, the last study using 1D HEC-RAS, but the model has several lackness related to the rates of meandering velocities and discharges at the river edges, whereas, these numbers have significant effects for river scouring. Since several studies which applied 2D and 1D/2D coupling hydraulics modelling have been providing satisfactory results on complex river, this research was redeveloped and compared the meandering segment by using 2D HEC-RAS and Coupling 1D/2D HEC-RAS. Using rainfall data from three stations (Bendung Gadog, FT UI and Gunung Mas), the models indicated better results comparing with 1D model beside relations between velocity and discharge, respectively. Further, a diversion channel and stilling basin will be held in order to manage the flooding and scouring issues.
Danau Tempe merupakan danau paparan banjir di Provinsi Sulawesi Selatan yang dikelilingi tiga kabupaten yaitu Sidrap, Soppeng, dan Wajo. Kapasitas Danau Tempe dipengaruhi oleh inflow yang masuk ke danau. Dalam mendukung operasional pemanfaatan dan konservasi air, telah dibangun Bendung Gerak Tempe untuk mengatur dan mempertahankan tinggi muka air (TMA) di danau. Intensitas hujan yang tinggi menyebabkan air danau meluap dan membanjiri daerah sekitar danau sehingga menimbulkan kerugian materil yang besar. Untuk mengurangi genangan banjir tersebut, dilakukan kajian optimasi kapasitas Danau Tempe. Optimasi dilakukan dengan mengatur tinggi bukaan pintu yang optimal pada Bendung Gerak Tempe menggunakan model hidrologi. Pada kajian ini digunakan nilai curve number (CN) dari sungai-sungai yang mengalir ke danau, yang merupakan fungsi dari 2 skenario tutupan lahan yaitu kondisi saat ini dan rencana RTRW Provinsi Sulawesi Selatan. Berdasarkan pemodelan hidrologi didapatkan inflow Danau Tempe berupa debit puncak periode ulang (Q25) untuk skenario kondisi saat ini sebesar 11.825,83 m3/s, dan untuk skenario rencana RTRW Provinsi Sulawesi Selatan sebesar 11.606,62 m3/s. Pemodelan hidrodinamika 2D mensimulasikan berbagai tinggi bukaan pintu pada Bendung Gerak Tempe terhadap luas genangan banjir. Kapasitas Danau Tempe yang optimal untuk mengurangi banjir tercapai dengan mempertahankan TMA pada elevasi +7,53 m dpl dengan tinggi bukaan pintu 4 m.
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