An evaluation of the design of the proposed Kemuning diversion channel

Tohary, Bahmid (1993) An evaluation of the design of the proposed Kemuning diversion channel. Masters thesis, Memorial University of Newfoundland.

[English] PDF (Migrated (PDF/A Conversion) from original format: (application/pdf)) - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Download (5MB) [English] PDF - Accepted Version Available under License - The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. (Original Version)

Abstract

The construction of the Kemuning Diversion channel is designed to address the flooding problem of the city of Sampang, Indonesia. Under the proposed scheme the Kemuning River, which causes this flooding (drainage area = 345 km²), will be divided into two channels upstream of the city. The downstream limit for both channels is the Strait of Madura. The diversion channel will carry much of the flood waters away from the old channel through Sampang (population ~ 1,000,000). The proposed design, which was developed by a local engineering consultant, did not include any analysis of possible future channel changes caused by sediment budget imbalances. This thesis is concerned with the analysis of the possible channel changes associated with relatively long periods of operation. The problem was evaluated by using a deductive approach, which involved application of a mobile bed mathematical model of the channel, and an inductive approach, based on regime theory. -- Using the deductive approach, estimated channel changes were derived by solving the sediment-continuity equation together with Laursen's and Yang's method for calculating the rate of sediment transport. Initial sediment movement was determined using a critical hydraulic shear stress, estimated from available soil data in and around the proposed channel. Hydraulic computations, which were also used to calculate the rate of sediment transport, were performed using the standard step method and the Manning equation. To simulate twenty years of hypothetical operation, water discharge inflows of interest were selected using the historical flow duration curve, which was set up as a series of discrete discharges. -- The estimated channel changes were simulated using mean sea level (MSL) as the downstream boundary condition. The channel bottom was found to exhibit aggradation all along its length.

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