상부체사피크만에서의 부유사 모델의 보정 및 검증

Abstract

A suspended sediment (SS) transport model is developed and internally linked to the CH3D-WES model. The model is based on the mass-balance equations for three size classes representative of the Upper Chesapeake Bay. The first class (3 µm) consists of fine particles that are in more or less continual suspension in water column and thus constitute the background concentration. The second class (18 µm) consists of medium particles that are alternately eroded and deposited by tidal current and the last class (65 µm) of coarse particles that stay at the bed most of the time. No interaction among size classes and no effect of the SS on the hydrodynamic field are assumed. The present model employs an empirical formulation to account for depth-limited erosion by varying the critical shear stress for erosion, tce, as a function of eroded mass. The model is applied to the Upper Chesapeake Bay to simulate annual conditions in 1996. The model is calibrated against a coefficient in the formulation of depth-limited erosion with the intensive data in Sanford et al. (2001) and verified with the Chesapeake Bay Program monitoring data. The three size classes appear to behave as they are intended to and the model gives a reasonable reproduction of the data, not only for intertidal but for intratidal variations in salinity and SS concentration.