intro story Coast / Estuary

Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 




Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems



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Bijker formula

Guilherme Silva, modified 5 Years ago.

Bijker formula

Youngling Posts: 1 Join Date: 2/15/12 Recent Posts

I'm doing my PhD on sediment transport and I was checking the formulations on Delft3D manual. I have a question related to the formula 11.108 (page 359 of Flow Manual version 3.15 rev:18392).

This formula will define the coefficient for shallow or deep waters coefficient for Bijker formula. My questions is:

Following the b equation (11.108) it seems to be the other way around (BD should be BS and BS should be BD). I did some calculations and using the equation provided it leads to the opposite interpretation (5 for deep water and 2 for shallow water). I tried to change the BD for BS and seems to be ok (maybe a misswriting): smoothly changing from 2 (deep water) to 5 (shallow water). Am I right or I'm missing something?

Thank you in advance,