Total Sediment Potential Downstream in The River Basin With Effects Causing Shallowing of The Bay

Abstrak

The sedimentation process begins with watershed conditions, land erosion, flow transport, and the deposition or sedimentation on the riverbed. One river experiencing problems in Kendari City is the Wanggu River. This river traverses Kendari City, with its headwaters located in South Konawe Regency and its downstream outlet discharging into the bay within Kendari City. The sedimentation problems are largely caused by changes in land use within the watershed and the rapidly increasing urban development. As a result of increased sedimentation in the area, heavy rainfall seasons often cause flooding along the riverbanks, which adversely affects local communities, and causes the silting of Kendari Bay. This study aims to analyze the magnitude of sedimentation potential in the Wanggu River based on predictive results, and to directly measure the sedimentation occurring at observation points located upstream of the retention pond and at the river mouth/bay. The study results indicate that the sediment potential entering Kendari Bay, based on predictions calculated using the MUSLE method, is 49,609.50 tons/year; the measured sediment calculated using the (Instantaneous + MPM) method is 19,262.06 tons/year; and the total measured sediment calculated using the (Instantaneous + Einstein) method is 14,994.63 tons/year.

Kata kunci

• Einstein method
• Instantaneous method
• MPM method
• River
• bedload
• sedimentation
• suspended sediment