Abstract
Sigeleng River Estuary is located in Brebes Regency. The mouth of Sigeleng River Estuary suffering morphological change that caused by the sand spit that close the mouth of river estuary and creating deflection.
 The results of characteristics test of the sediment from the estuary of Sigeleng River shows that the average density is 2.228 kg/l and the average particle diameter (D60) is 0.466 mm. On the other hand the largest result of total suspended solid test of the sediment samples is 1.58 mg/l. According to USDA, the soil texture in B location is Silt Loam and in A and C location are Sandy Loam. SED2D modeling that performed for 720 hours that assumed as 1 year shows a base elevation change that is 11,79%-30,20% in the river estuary mouth at the existing condition 
 Sediment cumulation that occurred around the mouth of the Sigeleng River Estuary within 5 years is 0.007 m - 2,560 m, while the depth of the Sigeleng River Estuary is only -3.00 m. Therefore, a treatment by dredging the sediment aroud the mouth of Sigeleng River Estuary is needed so that the river estuary is not closed.
Highlights
River estuary is a part of river downstream that directly connected to the beach
The problems of river estuary can be seen from the river mouth and river estuary itself
River estuary is the part of a river that affected by the tides
Summary
River estuary is a part of river downstream that directly connected to the beach. The problems of river estuary can be seen from the river mouth and river estuary itself. River mouth is the part of downstream that directly connected to the beach. River estuary is the part of a river that affected by the tides. River estuary serves as the river discharge exit to the sea especially when flooding. The river estuary that located in the end of the downstream causes the discharge flow in the estuary to be greater than the river in the upstream area
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