Calibration of a Water Quality Model for Lake Ashtabula, North Dakota.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
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A mathematical model of Lake Ashtabula Reservoir, Valley City, North Dakota, was developed based on the one-dimensional reservoir water quality model CE-QUAL-R1. The major assumption employed in CE-QUAL-R1 is that the reservoir is represented as a vertical series of completely mixed horizontal layers in which longitudinal and lateral variations of constituent concentrations cannot be predicted. Lake Ashtabula, whose pool is long, narrow, and largely confined to the run-of-the-river, exhibits both vertical and longitudinal water quality gradients. The reservoir is constricted at two points along its length, essentially dividing the system into three distinct pools. In order to represent this two-dimensional aspect of the system, the model was organized using three CE-QUAL-R1 pools coupled in series in which the simulated outflow constituent quantites for the first and second pools became the inflows for their respective downstream pools. By using this model configuration, it was possible to simulate longitudinal as well as vertical variations of constituent concentrations. Author
- Hydrology, Limnology and Potamology
- Civil Engineering