. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography AUTOCHTHONOUS PATTERNS OF SEDIMENTATION 341. Extinction (against distilled water) I I (Ml I I (> Dutch coast) ^> ^> Residual currents FIGURE 33. Turbidity (light extinction) given by Joseph (1955) with the residual cur- rent pattern in the southern North Sea. Two advective mud streams are illustrated, one crossing from the English to the Dutch side of the area, the other running up the Dutch coast
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography AUTOCHTHONOUS PATTERNS OF SEDIMENTATION 341. Extinction (against distilled water) I I (Ml I I (> Dutch coast) ^> ^> Residual currents FIGURE 33. Turbidity (light extinction) given by Joseph (1955) with the residual cur- rent pattern in the southern North Sea. Two advective mud streams are illustrated, one crossing from the English to the Dutch side of the area, the other running up the Dutch coast from the mouths of the Plime River. Actual sediment ccncentrations are higher in the latter. From McCave (1972). determined by the local relationship between the hy- draulic activity (primarily wave surge) on the bottom and the near-bottom concentration of suspended sedi- ment (Fig. 35), as well as by the regional transport pattern. On autochthonous shelves, sand transport is primarily advective in nature, occurring during short, intense episodes of wind-driven or tidal flow, and textural gradients tend to reflect the direction of sand transport, with transport becoming finer down the transport path (see Figs. 25 and 27). The transport of fine sand and mud on shelves undergoing allochthonous sedimentation is also primarily advective in nature, in that the turbid water tends to flow as a mass in response to the regional circulation pattern. However, because of the greater role of reversing tidal currents and wave surge in dis- tributing fine sediment it is convenient to think of fine sediment transport on allochthonous shelves as consisting of a dominant advective component, driven by the regional circulation pattern, and an important but subordinate diffusive component, driven by reversing tidal flows and wave surge. The diffusive component of transport not only in- fluences the regional pattern of fine sediment deposition as noted in Fig. 35 and Chapter 9, Fig. 15, but may als
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