TECHNICAL APPROACH OF EROSION AND SEDIMENTATION ON CANAL (CASE STUDY IN DELTA TELANG I, BANYUASIN, SOUTH SUMATRA PROVINCE)
1Achmad Syarifudin, 2Momon Sodik Imanudin, 3Arie S Moerwanto, 3Muhammad Yazid, and 3FX Suryadi
Abstract. Dynamics of the water level in the swamp area in both tertiary and in the channels is strongly influenced by several conditions, among others: the amount of rainfall, land hydrotopography, potential flood tide, the potential for drainage, water management network conditions, and operation of the waterworks building. Those components must be evaluated and analyzed to support the plant water needs. In the channel itself it is needed direct observations in the field in order to get accurate observational data. But this way takes time, effort, and considerable expense. Therefore the use of computer models to predict and evaluate the performance of the network is an appropriate solution. This study examined the existing condition and SDU SPD channels on the secondary block of P8-13S Telang I swamps by analyzing sediment cohesiveness in the channel, cross-sectional survey, and profile measurements of longitudinal channels as well as observations of water level in the channel for 2 times in 24 hours. The results showed that the erosion occurring on cross section roads of SPD P0 (at the beginning line) was 5,001.5 m3. On the P38 segment (middle line) and P&^ segment (end line), the erosions were 3,444) and 3228 m3 . cumulatively, the erosion on the channel SPD amounted to 126,713.5 m3. SDU channel sedimentation occurring at P0 segment (initial line) was 582.2 m3. On P36 segment (middle line) scale sedimentation was 915.5 m3 and on the segment P74 (end line), the sedimentation value was 1,088.5 m3. Cumulatively, the amount of sediment in the channel SDU P8-13S was 34,184.7 m3.
Keywords: Canal in wetlands, dynamics of water level, erosion, and sedimentation
Tidal marsh areas are generally areas that have relatively flat topography, situated at the river mouth near the beach, and naturally formed and also influenced by tides on a periodic basis. Characteristic of the tidal marsh area is very unique when compared to the technical irrigation area because water supply availability of tidal marshes is always of high and low tides of the seawater. The land has unique properties that are acidic, pyrite and peat contents, and salt-water intrusion during dry season.