Implementation of a wetting-and-drying model in simulating the Kennebec–Androscoggin plume and the circulation in Casco Bay

Xue, Huijie; Du, Yi

doi:10.1007/s10236-010-0269-3

Cited by 18 publications

(19 citation statements)

References 30 publications

(45 reference statements)

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“…For a water depth smaller than a given value such as 0.1 mm, the flow depth was selectively assigned as the dry depth. This is why the method is also called a thin film method (Medeiros and Hagen, 2012) or point treatment method (Xue and Du, 2010). The velocity corresponding to a dry node is set to be zero.…”

Section: Flux-blocking Methods For Drying Floodplainmentioning

confidence: 99%

Stability analysis of riverfront facility on inundated floodplain based on flow characteristic

Song

Kim

et al. 2016

J Flood Risk Management

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Recent years have seen an increase in the intensity of extreme rainfalls and the frequency of floods caused by climate change. As a result, South Korea is facing an ever‐increasing risk of flooding due to typhoons in the summer season. In South Korea, since the implementation of the ‘Four Major Rivers Restoration Project’, a variety of eco‐friendly riverfront facilities, such as ecological parks as well as sports and recreation areas, have been constructed on floodplains. These riverfront facilities have a high risk of damage due to inundations during the rainy season. To perform hydraulic analysis and stability assessment of these facilities, accurate numerical modelling is necessary. First and foremost, it is crucial to address the dry/wet (DW) phenomena caused by rising and falling water levels. In this study, a two‐dimensional (2D) finite element model was developed and its applicability was checked against the results of various DW analyses. The developed 2D model was then applied to a natural river undergoing DW phenomena. In the validation test, the applied 2D model demonstrated a high correlation coefficient (R2 = 0.954). Subsequently, using the results of the model, we calculated four types of flood risk indexes and analysed their correlations to evaluate the stability of the riverside facilities.

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Section: Flux-blocking Methods For Drying Floodplainmentioning

confidence: 99%

Stability analysis of riverfront facility on inundated floodplain based on flow characteristic

Song

Kim

et al. 2016

J Flood Risk Management

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“…Similar advective processes are likely important in Broad Sound. Advection of a more stratified offshore water mass is a reasonable possibility, as it has been shown that discharge from the Kennebec-Androscoggin River system can generate a reverse buoyancy gradient in outer Casco Bay [Janzen et al, 2005;Xue and Du, 2010] and the New Meadows River estuary (to the northeast of the study region) [Kistner and Pettigrew, 1999] during the period of high discharge. Additionally, the complex bathymetry (i.e., irregular shoals and narrow passage ways) shoreward of the transect in Broad Sound would be expected to drive more mixing in the shallower waters of inner Casco Bay.…”

Section: 1002/2014jc010481mentioning

confidence: 99%

Spatial and temporal variability of the velocity and hydrographic structure in a weakly stratified system, Broad Sound, Casco Bay, Maine

2015

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The velocity and hydrographic structure across Broad Sound, a north-south orientated subsystem of Casco Bay, ME that lacks continuous coastal boundaries, were characterized using velocity observations from two moorings in late summer/fall of 2013 and velocity and density observations from a repeattransect ship survey conducted over a tidal cycle during the same period. At tidal time scales, the system is dominated by a barotropic semidiurnal standing wave with a west to east decrease in tidal amplitude and relatively minimal phase change across the majority of the transect. The stratification (vertical differences of 0.5-1.0 kg m 23 ) was generally laterally uniform and stronger during the flood phase which is hypothesized to result from stronger offshore stratification. The mean circulation had strong lateral shear with inflow over the deepest point in the bathymetric cross section and eastern slope and outflow over the western slope. There was also vertical shearing of the horizontal velocities with stronger northward (or northward trending) velocities at depth. The depth-averaged subtidal fluctuations were relatively small ($2-3 cm s 21 ) and uncorrelated between mooring sites suggesting the vertically uniform current response associated with remote wind forcing is of limited importance. On the other hand, the depth-dependent velocity fluctuations at the subtidal time scale were, in large part ($36-72%), driven by wind forcing. The net flux ratio, a means of quantifying the relative importance of the vertical and lateral shear in the flow field, was typically $0.44 indicating the structure of the local wind response favored vertically sheared flow.

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“…Research by Xue and Due [27], Uchiyama [28], Oey [29,30], and Oey et al [31] has indicated that the bottom drag coefficient must be adjusted if the water depth approaches the bottom roughness height. How to perform this adjustment is an area for further consideration.…”

Section: The Model Overview Its Grid and Subsequent Revisionsmentioning

confidence: 99%

Towards the Development of the National Ocean Service San Francisco Bay Operational Forecast System

Peng

Schmalz

Zhang

et al. 2014

JMSE

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Abstract:The National Ocean Service (NOS), Center for Operational Products and Services installed a Physical Oceanographic Real Time System (PORTS) in San Francisco Bay during 1998 to provide water surface elevation, currents at PORTS prediction depth as well as near-surface temperature and salinity. To complement the PORTS, a new nowcast/forecast system (consistent with NOS procedures) has been constructed. This new nowcast/forecast system is based on the Finite Volume Coastal Ocean Model (FVCOM) using a computational domain, which extends from Rio Vista on the Sacramento River and Antioch on the San Joaquin River through Suisun and San Pablo Bays and Upper and Lower San Francisco Bay out onto the continental shelf. This paper presents the FVCOM setup, testing, and validation for tidal and hindcast scenarios. In addition, the San Francisco Bay Operational Forecast System (SFBOFS) setup within the NOS Coastal Ocean Model Framework (COMF) is discussed. The SFBOFS performance during a semi-operational nowcast/forecast test period is presented and the production webpage is also briefly introduced. FVCOM, the core of SFBOFS, has been found to run robustly during the test period. Amplitudes and epochs of the M 2 S 2 , N 2 , K 2 , K 1 , O 1 , P 1 , and Q 1 constituents from the model tide-only simulation scenario are very close to the observed values at all stations. 248NOS skill assessment and RMS errors of all variables indicate that most statistical parameters pass the assessment criteria, and the model predictions are in agreement with measurements for both hindcast and semi-operational nowcast/forecast scenarios.

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Implementation of a wetting-and-drying model in simulating the Kennebec–Androscoggin plume and the circulation in Casco Bay

Cited by 18 publications

References 30 publications

Stability analysis of riverfront facility on inundated floodplain based on flow characteristic

Stability analysis of riverfront facility on inundated floodplain based on flow characteristic

Spatial and temporal variability of the velocity and hydrographic structure in a weakly stratified system, Broad Sound, Casco Bay, Maine

Towards the Development of the National Ocean Service San Francisco Bay Operational Forecast System

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