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. 
 

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

 

 

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inconsistency in DIMENSIONAL ANALYSIS

SN
Sathya narayanan, modified 5 Years ago.

inconsistency in DIMENSIONAL ANALYSIS

Youngling Posts: 3 Join Date: 3/13/14 Recent Posts
Hello,
With reference to page no. 350 in D-Water Quality Technical reference manual (Version: 5.01.34078) dated 26 May 2014, i found that there seems to be inconsistency in DIMENSIONAL ANALYSIS. The term kmrd has the unit (d-1), but the product of UNITS of the terms krd, DL ,fuv , I0 and (1 - e^-epsxH)/epsxH) become UNIT LESS which is completely contradicting. Would anyone help me in giving the correct terms with proper UNITS?


Formulation

The mortality rate of coliform bacteria can be quantified with the following empirical function
of temperature, chlorinity and solar radiation (as derived from visible light):
For T > Tci:

Rmrti = kmrti x Cxi

kmrti = (kmbi + kmcli) x ktmrti^(T-20) + kmrd
kmcli = kcli x Ccl
kmrd = krd x DL x fuv x I0 x (1 - e^-epsxH)/epsxH

For T <= Tci:
Rmrti = 0:0

where:
Cx concentration of coliform bacteria species i [MPN.m-3]
DL daylength [d]
eps extinction of UV-radiation [m-1]
fuv fraction of UV-radiation as derived from visible light [-]
H water depth [m]
I0 daily solar radiation as visible light at the water surface [W.m-2]
kcl chloride related mortality constant [m3.g-1.d-1]
kmb basic mortality rate [d-1]
kmcl chloride dependent mortality rate [d-1]
kmrd radiation dependent mortality rate [d-1]
kmrt first order mortality rate [d-1]
krd radiation related mortality constant [m2.W-1.d-1]
ktmrt temperature coefficient of the mortality rate [-]
Rmrt mortality rate of coliform bacteria [MPN.m-3.d-1]
T temperature [°C]
Tc critical temperature for mortality [°C]
Ccl chloride concentration [g.m-3]
i index for coliform species, ECOLI, FCOLI, TCOLI and ENCOC


Thanks
AA
Anonymous Anonymous, modified 5 Years ago.

RE: inconsistency in DIMENSIONAL ANALYSIS

Jedi Master Posts: 333 Join Date: 7/30/20 Recent Posts
Hi Sathya,

I think you can consider daylength as a fraction here, hence without units, which yields [d-1] fro kmrd.

Regards