The EFFECT OF SEDIMENTS ON FLOW CURRENT IN MODELING HIGH TURBULENCE FLOW OF WATER IN THE CHANNEL TO THE DEBIT

Abstract

The problem of sedimentation in rivers has become a familiar phenomenon in the maintenance of a river basin. This sediment transfer does occur naturally in a watershed, but the situation is getting worse and becomes a big problem if this is supported by the destructive actions of humans. These destructive activities include converting land use around the river into agricultural land, fields, infrastructure buildings so that plant varieties are cut down that can withstand erosion. The impacts that arise due to sedimentation are certainly very detrimental and cause many problems. The reduced capacity of river capacity is the main thing, which causes flooding in the rainy season, the need for clean water is not fulfilled because the reservoir has experienced silting, and the river's ability to drain is getting smaller. Sediment will continue to accumulate and settle in low areas, namely downstream near the estuary which has a relatively gentle slope of the riverbed and small flow turbulence, thus forming a formation that is in the form of a delta. This problem needs to be studied by simulating the modeling of sediment distribution patterns and the things that affect the movement and movement of sediment. The modeling was carried out by simulating a sluice gate and several samples of sediment that flowed into the tilting flume with several variations of openings. After modeling and applying the theory of hydraulics to the flow, several conclusions will be drawn regarding the effect of sediment on the flow pattern. After obtaining data on the displacement distance and the influence of sediment on the flow, the watershed management can plan the placement of check dams to slow down the flow rate and inhibit the sediment rate, and plan a stilling pond to reduce sediment scouring. The largest sediment displacement occurred in the upstream sand with a flow opening of 3/4 and a flow velocity of 0.053653 m/sec, a discharge of 0.00483 m3 /second, and flow strength of 0.2105 N/second. With this data, it can be used as a reference consideration in planning distances in the manufacture of check dam buildings upstream.