Prediksi Laju Sedimentasi di Perairan Teluk Benoa Menggunakan Pemodelan Numerik

Abstract

Benoa Bay is one of the unique ecosystems on the island of Bali because it is a shallow estuary area and has an ecosystem that is important for the waters of the mangrove ecosystem and seagrass. In recent years, Benoa Bay has been reported to have undergone siltation due to sedimentation. However, there has not been much scientific study of the sedimentation rate occurring in Benoa Bay. The study of sedimentation will provide an overview of the rate of sedimetation in the study area. Numerical modeling is one of the most commonly used methods to describe hydrodynamic processes in waters, which are the main drivers of the process of movement of pollutants in waters such as waste, sediment, and others. Thus, the study of sedimentation rate, either spatially or temporally, needs to be done in the waters of Benoa Bay using numerical modeling. The results of this study show that sedimentation rates in Benoa Bay have a minimum value of 1.08x10-6 and a maximum of 24.88 kg/m2/day with an average of 0.57 kg/m2/day. High sedimentation rates occur in the western part of the bay, on the river route, and in the northern part of the bay, between Serangan Island and Mertasari beach. Areas that potentially experience silting in Benoa Bay include the southern port of Benoa Harbor which reaches 0.23 m/year, the waters north of Serangan Island reaching 0.008 m/year, and the area close to the estuary which reaches 0.35 m/year.

Sedimentation Profile in Coastal Water Jakarta Bay

“…Intrusi padatan tersuspensi dapat mempengaruhi pengendapan sedimen di dasar perairan. Laju sedimentasi yang tinggi dapat menyebabkan pendangkalan badan air secara cepat, sehingga nantinya akan mengubah kedalaman perairan (Maharta et al 2019). Laju sedimentasi suatu perairan juga dipengaruhi oleh banyak faktor, salah satunya adalah limpasan air.…”

Pemodelan Distribusi Nitrat di Kawasan Perairan Teluk Benoa

“…Dalam mengkaji kondisi di suatu perairan terdapat beberapa metode yang bisa digunakan, salah satunya metode pemodelan numerik. Pemodelan numerik merupakan metode yang mampu memodelkan suatu keadaan dari keadaan sebelumnya maupun dimasa datang misalnya seperti pergerakan limbah atau polutan, sedimen, partikel dan lainnya (Chen et al, 2006;Maharta et al, 2019). Peneltian menggunakan pemodelan numerik sebelumnya pernah dilakukan di Teluk Benoa yaitu pada penelitian Hendrawan and Ardana (2010) menggunakann Priceton Ocean Model (POM) untuk mengetahui konsentrasi fosfat di permukaan perairan Teluk Benoa, Hendrawan and Asai (2014) menggunakan Finite Volume Coastal Ocean Model (FVCOM) untuk mengkaji arus pasang surut dan pertukaran massa air di Teluk Benoa.…”

Effect of Debris Flow Event on the Affected Areas in Putih River, Indonesia

“…Prediction of affected areas can be made through numerical modeling. Numerical modeling is one method that is often used to determine the process of hydrodynamic movements, such as the movement of waste and sediment [9]. One of the existing numerical modeling currently being developed is SIMLAR (Lahar Simulation).…”