Abstract
Sedimentation on Pare bay and Karajae estuary originated from the run off of Karajae River. Highsedimentation process leads to the adverse effect of abiotic environmental changes. The aim of thisresearch is to analyse bathymetry condition and hydrodynamic characteristics of the area inunderstanding sediment distribution on Pare Bay. Corrected bathymetric data by tide data isprocessed using Surfer software 9.0 versions to analyse Pare Bay contour in 2D and 3D, the resultshow depth ranges from 0 to 20 meters. Flow model module by MIKE 21 software was used inhydrodynamic simulation (MRSE 11.44%) and shows that current condition in Pare Bay wasdominated by tidal (within its speed up to 0.43 ms-1), surface currents speed is higher and morerandom than the speed in water column and near bottom. Due to its location, Pare Bay is directlyinfluenced by Indonesian Through flow which has strong currents flow and cause mixing andturbulence along its way, this condition influences Pare Bay condition, especially in the process ofsedimentation and turbulence. Keywords: bathymetry, currents, hydrodynamics, sedimentation, pare bay
Highlights
Pare Bay is located in South Sulawesi coastal area, it has about 2778 Hectares water area, 34 km coastline, and water depth of about 0.75 meters below the water surface within shallow depth at the northern part and reaches 20 meters at middle area
Sedimentation along Pare bay and its surrounding area originated from material run of from Karajae River
This research conducted in Pare bay, Pare-pare, South Sulawesi on 16th September until 6th October 2015 collecting both primary and secondary data, primary data consists of bathymetry, sea currents and tide, whereas secondary data including bathymetry map from DISHIDROS and RBI map
Summary
Pare Bay is located in South Sulawesi coastal area, it has about 2778 Hectares water area, 34 km coastline, and water depth of about 0.75 meters below the water surface within shallow depth at the northern part and reaches 20 meters at middle area. There are several estuaries wherein directly adjacent with Karajae river and intertidal zone potential in sedimentation and shallowing process on coastal and estuary area (Qarni, 2008). Sedimentation along Pare bay and its surrounding area originated from material run of from Karajae River. The main factor of causing the silting is a class C mining excavation in upstream and downstream area, the sedimentation is influenced by domestic waste flowing through rivers with its sediment particles (Qarni, 2008). Tidal currents at estuary moving at low speed and sediments originated from both land and sea are not transported maximally it causes silting in the bay (Wisha et al, 2015)
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