PROCESS-BASED MORPHOLOGICAL MODELING OF GRAYS HARBORINLET AT DECADAL TIMESCALES

摘要

A process-based morphological model is used to examine flow, wave, and sedimentrntransport processes around the inlet and ebb-tidal delta of Grays Harbor, Washington.rnResults of the modeled bed-level changes are then compared to historical morphologicalrndata sets from the inlet and delta. Input reduction techniques were used to reducerncomputational time, which allowed for transport and bed-level simulations over a fullrnyear. Included in these techniques were a representative tide and wave climatology.rnModel results suggest that wave-driven currents during large waves shape the outer deltarnand net southerly tidal currents along North Beach caused southerly spit growth. Floodrntide driven transport into the inlet along the northern side of the entrance was inhibited byrnjetty construction. After jetty construction, the net transport of sediment out of thernentrance area was doubled compared to the pre-jetty condition. The morphologicalrnmodel does not successfully simulate the northern migration of the outer ebb-tidal delta.rnIncluding wind-driven currents in the hydrodynamic module will likely improve thernmodel results by more accurately representing the inner shelf currents that occur duringrnstorms.