DMS Diagnostic Modeling System DMS : Diagnostic Modeling System dmsdiagnosticmod00krau Year: 2000 Harwood (1973) discounts typical currents flowing through the pass as being capable of creating and supporting either a permanent flood or ebb delta. The reasoning is that flood and ebb deltas are not prominent at other inlets on the Texas coast, nor is a rehc ebb delta found opposite Matagorda Peninsula, which would have been abandoned as Delcros Point that migrated to the south in geologic time scales. The consequence of bearing for the present smdy is that clear empirical evidence indicates
DMS Diagnostic Modeling System DMS : Diagnostic Modeling System dmsdiagnosticmod00krau Year: 2000 Harwood (1973) discounts typical currents flowing through the pass as being capable of creating and supporting either a permanent flood or ebb delta. The reasoning is that flood and ebb deltas are not prominent at other inlets on the Texas coast, nor is a rehc ebb delta found opposite Matagorda Peninsula, which would have been abandoned as Delcros Point that migrated to the south in geologic time scales. The consequence of bearing for the present smdy is that clear empirical evidence indicates a strong current issuing through an inlet or entrance in Matagorda Bay can transport sediment and deposit it as far as 3 irules bayward of the inlet or entrance. Figure 3. Shrimp boat sunk in Pass Cavallo (September 1997) Tidal prism is defined as the product of bay water-surface area and the tidal range, typically the spring tidal range. Harwood (1973) concluded that the cross-sectional area of Pass CavaUo decreased after the Colorado River delta eliminated the water-surface area of East Matagorda Bay from the bay system because of the decrease in tidal prism. Her conclusion was based on estimates of the tidal prism and the cross-sectional areas of Pass CavaUo as interpreted from navigation charts and a sateUite photograph (for the year 1971). She Usts six dates from 1856 to 1971 for which survey data were available for study. By 1971, the discharge through Pass Cavallo had decreased as compared to estimates from earUer dates. With diversion of the Colorado River back to Matagorda Bay in 1992, this cause for a reduction in flow out of the bay was eliminated. More significantly, the discharge through Pass Cavallo has decreased because the Matagorda Ship Channel (MSC) opened in September 1963, as also noted by Harwood (1973). Ward (1982) compared measured tidal prisms of Pass Cavallo and the MSC available from 1959 to 1976 and showed that the MSC had already capmred half the
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