Reservoir Sedimentation Model with Continuing Distribution, Compaction, and Sediment Slump,
IOWA INST OF HYDRAULIC RESEARCH IOWA CITY
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A comprehensive reservoir simulation scheme has been developed to estimate changes in the reservoir profile due to sedimentation over any length of reservoir operation. The model includes several input submodels, e.g., time series models for generating sequences of water inflow, sediment inflow, and evapoartion, and an operating submodel to supply necessary input data to the sedimentation submodel, which forms the heart of the simulation scheme. The sedimentation submodel estimates the total volume of sediment trapped in the reservoir in a selected time interval, and then distributes this over the height of the reservoir, based on a modified version of Borland and Millers 1960 empirical area-reduction method. This modification enables the use of the model for any interval of sedimentation, while Borlands original method is applicable only for large 10 years or more sedimentation periods. Deposited sediments are compacted and necessary corrections are applied to remove anomalies caused by slumping due to differential compaction of different sediment components sand, silt, and clay in the vicinity of the zero elevation and at the sediment zone interfaces. The simulation model, at the end of each time interval, outputs the water outflow, the reservoir pool elevation, the volume of deposited sediment with its distribution over the reservoir height, the resulting new zero elevation, and the adjusted elevation-area-volume relationship.
- Civil Engineering