. Coastal hydraulic models. Hydraulic models. TOP VIEW OF HEADBAY OPERATION OF TIDE GENERATOR THE WATER SURFACE IN THE MODEL (A) IS APPRECIABLY HIGHER THAN IN THE SUMP (B). A PUMP (C) LOCATED IN THE SUMP DISCHARGES A CONSTANT AMOUNT OF WATER INTO ONE SIDE OF A DIVIDED HEADBAY (D). DISCHARGE FROM THE MODEL TO THE SUMP IS CONTROLLED BY AN AUTOMATIC VALVE (El. OPERATION OF THE AUTOMATIC VALVE IS DICTATED BY THE TIDE CONTROL (F) LOCATED IN THE MODEL. WHEN THE TIDE IS RISING IN THE MODEL, THE AUTOMATIC VALVE IS ALMOST CLOSED SO THAT MOST OF THE WATER REMAINS IN THE MODEL. WHEN THE TIDE IS FALL- ING
. Coastal hydraulic models. Hydraulic models. TOP VIEW OF HEADBAY OPERATION OF TIDE GENERATOR THE WATER SURFACE IN THE MODEL (A) IS APPRECIABLY HIGHER THAN IN THE SUMP (B). A PUMP (C) LOCATED IN THE SUMP DISCHARGES A CONSTANT AMOUNT OF WATER INTO ONE SIDE OF A DIVIDED HEADBAY (D). DISCHARGE FROM THE MODEL TO THE SUMP IS CONTROLLED BY AN AUTOMATIC VALVE (El. OPERATION OF THE AUTOMATIC VALVE IS DICTATED BY THE TIDE CONTROL (F) LOCATED IN THE MODEL. WHEN THE TIDE IS RISING IN THE MODEL, THE AUTOMATIC VALVE IS ALMOST CLOSED SO THAT MOST OF THE WATER REMAINS IN THE MODEL. WHEN THE TIDE IS FALL- ING IN THE MODEL, THE VALVE IS ALMOST OPEN SO THAT ALL THE WATER FROM THE PUMP, PLUS THE DESIRED AMOUNT OF WATER FROM THE MODEL RETURNS TO THE SUMP, THE TIDE CONTROL MAINTAINS THE PROPER VALVE OPENING AT ALL TIMES AS REQUIRED TO REPRODUCE ANY DESIRED TIDE IN THE MODEL. Figure 3-15. Operation of pumped inflow and gravity outflow tide generator. TIDE DISPLAY SIGNAL TIDE DISPLAY DRUM . TIDE CONTROL DRUM z TIDE DISPLAY TIDE ELEVATION AT CONTROL POINT TIDE CONTROL SIGNAL TIDE ELEVATION AT CONTROL POINT TIDE HEIGHT DATA VELOCITY DATA SALINITY DATA TEMPERATURE DATA HYBRID INTERFACE CENTRAL PROCESSING UNIT MAGNETIC TAPE HANDLER OPERATOR'S CONSOLE n VALVE POSITION I COMPARATOR HYDRAULIC AMPLIFIER BUBBLE-TUBE POSITIONER niM DATA SIGNALS (UP TO 8) \M. TEMPERATURE DATA SALINITY DATA VELOCITY DATA TIDE HEIGHT DATA VELOCITY SALINITY METER METER DIGITAL VOLTMETER THERMOCOUPLE POTENTIOMETER ^:;^~))PUMP Figure 3-16. Automatic Data Acquisition and Control System (ADACS) 83. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hudson, Robert Y. Fort Belvoir, Va. : U. S. Coastal Engineering Research Center ; Springfield, Va. : available from National Technical Information Service
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