Accession Number : ADA111812

Title :   Verification of the Chesapeake Bay Model.

Descriptive Note : Final rept.,


Personal Author(s) : Scheffner,Norman W ; Crosby,Leroy G ; Bastian,David F ; Chambers,A Michael ; Granat,Mitchell A

PDF Url : ADA111812

Report Date : Dec 1981

Pagination or Media Count : 315

Abstract : The Chesapeake Bay model, a fixed-bed model constructed to a horizontal scale ratio of 1:1000 and a vertical scale ratio of 1:100, reproduced the Chesapeake Bay from the ocean to the head of tides for each tributary. Reproduction extended to the +20 ft contour. The model was equipped with the necessary appurtenances to accurately reproduce and measure tidal heights, tidal currents, salinity distributions, and freshwater inflows. Due to the immense size of the model (8.6-acre model housed in a 14-acre building), complete computer control and data aquisition capabilities were provided. Severe limitations in prototype data in addition to substantial wind contamination of those data necessitated a detailed data analysis program which resulted in a modified approach to physical model verification. This was accomplished in the following two separate modes of operations: (a) verification for tidal heights and tidal velocities using an M sub 2 constituent tide and a constant long-term freshwater inflow; and (b) verification for salinities using a typical 28-day tidal cycle (with long-period wind energy filtered out) and inflow hydrographs reproduced in 2-week time-steps. A bubbler system was incorporated in the model to statistically reproduce the vertical mixing caused by wind fields acting on the prototype. Excellent verification of the model was achieved. (Author)

Descriptors :   *Hydraulic models, Chesapeake Bay, Instrumentation, Performance(Engineering), Accuracy, Ocean tides, Water flow, Velocity, Sea water, Salinity

Subject Categories : Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE