期刊
OCEAN MODELLING
卷 88, 期 -, 页码 54-71出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ocemod.2015.01.001
关键词
Estuarine circulation; Model validation; Autonomous underwater vehicle; Mixing processes
资金
- National Science Foundation [OCE-0424602]
- National Oceanic and Atmospheric Administration [NA11NOS0120036]
- Bonneville Power Administration [00062251]
- Corps of Engineers [AB-133F-12-SE-2046, W9127N-12-2-007, G13PX01212]
Numerical modeling of three-dimensional estuarine circulation is often challenging due to complex flow features and strong density gradients. In this paper the skill of a specific model is assessed against a highresolution data set, obtained in a river-dominated mesotidal estuary with autonomous underwater vehicles and a shipborne winched profiler. The measurements provide a detailed view of the salt wedge dynamics of the Columbia River estuary. Model skill is examined under contrasting forcing conditions, covering spring freshet and autumn low flow conditions, as well as spring and neap tides. The data set provides a rigorous benchmark for numerical circulation models. This benchmark is used herein to evaluate an unstructured grid circulation model, based on linear finite element and finite volume formulations. Advection of momentum is treated with an Eulerian-Lagrangian scheme. After the model's sensitivity to grid resolution and time step is examined, a detailed skill assessment is provided for the best model configuration. The simulations reproduce the timing and tidal asymmetry of salinity intrusion. Sharp density gradients, however, tend to be smoothed out affecting vertical mixing and gravitational circulation. We show that gravitational salt transport is underestimated in the model, but is partially compensated through tidal effects. The discrepancy becomes most pronounced when the stratification is strongest, i. e., under high river discharge and neap tide conditions. (C) 2015 The Authors. Published by Elsevier Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据