2015 : PhD defense Sébastien Barthélémy, May 12th, 2015 : Implementation of an Ensemble Kalman filter for MASCARET for hydraulic state correction over the Adour River and coupling with a local 2D model (Telemac) over the confluence area between the Nive and the Adour rivers. Finally, this paper concludes with a discussion of the key achievements of this study, and some general factors that should be considered during modelling. Usually, Figure 6 - Local loss coefficient for a sudden contraction as a function of diameter ratio between the diameter after the a correction coefficient is taken into account. This has important implications for nature and vegetation development. A model for culverts had already been implemented in TELEMAC-2D, and a new one was added in this work, with more flow configurations. In the downstream estuary the phytoplankton activity increases due to the restoration of oxygen and to the much lower turbidity values. As a novelty in release 6.0, we present a method of feedback for the bed roughness, which reduces uncertainty in the prediction of both transport rates and flow velocities.We use cookies to help provide and enhance our service and tailor content and ads. Conference: Telemac-Mascaret User Conference, At Paris, Volume: 23The numerical simulation of flows between (tidal) rivers and floodplains often requires the representation of hydraulic structures such as culverts. The paper includes several example applications of 3-D models. Comparing the first were used for the simulation of the December 6, 2013 storm For each set of parameters some variables are not shown type 5 occurs, was set to be 1.5. Model results show the possibility to introduce acceptable tidal influence in FCAs. The modelled water levels fitted very well the measured ones.All content in this area was uploaded by S. SmoldersCriterion for classifying flow types 5 and 6 in concrete box or pipe culverts with square, rounded, or beveled entrances, either with or without wing walls [4]Schematic representation of a culvert with the different parameters [6]Local loss coefficient for a sudden contraction as aFlow chart showing the conditions for every type of flow in the BUSE.f subroutine.All content in this area was uploaded by S. Smolders on Oct 17, 2018 Figure 1 - Bergenmeersen: Flood control area (FCA) with controlled reduced tide (CRT) along the Scheldt estuary, Belgium calibrated for a data set measured in 2014. Results show that the calibration of the model can be restricted to one scaling parameter due to linear dependency of the parameters. Goal: Storm surges, which are temporary oscillations in water level generated by interaction between atmospheric forcing weather systems and the sea, often cause significant loss of life and damage Although many river flood defence projects now use 1-D computational modelling as a standard tool of investigation, little use is made of higher dimensional models. The culvert functionality was re-written for this project in order to cover a wider range of flow conditions that can exist through a culvert (relatively to what is currently implemented in TELEMAC 2D). The open-source finite-element system Telemac has been applied to simulate various complex hydrodynamic and morphodynamic situations including waterways, curved channels, recirculating flows and wave-induced littoral transport.

For the outlet culverts CLP was set to 2, meaning only outflow due to the presence Table 4 - Parameter values for culvert calibration For the trash screen head loss equation 23 was used with was taken for the Manning Strickler value. 5/9/2013 15 Session 4b Fluvial and Coastal Model Calibration Andrew Jackson Session 4b: Fluvial and Coastal Model Calibration • Not always possible. differences in water levels inside the floodplain. A new culvert functionality was implemented in the code to better represent the hydrodynamics of the exchange of water between the Scheldt estuary and these flood control areas with controlled reduced tide. The model In recent years there has been an increase in the use of numerical hydraulic modelling programs by consulting engineers.

• recirculating flows where the results are sensitive to the choice of model parameters, and The model includes the Belgian coastal area, a small part of the neighbouring French coastal area and a part of the Dutch coastal area, including the Eastern Scheldt; the entire Scheldt estuary with tributaries and even the controlled flooding areas alongside the estuary. (A) It is the first time that all these areas of interest are included in a single schematisation with an appropriate local resolution. All rights reserved.head loss coefficient at the exit of the hydraulic critical water level inside the culvert (this will On the outlet culverts there are one-way valves present is extracted from [8] and for a culvert between a represents the head loss coefficient due to the friction 0) or circular (=1); in case of a circular culvert T. Cox, T. Maris, P. De Vleeschauwer, T. De Mulder, K. Soetaert, P. Wahl T.L., 1992. The Red line indicates the modelled water level when using the September 2014 valve positions in the culvert The results are not perfect yet, but are coming very simulation (remember that Flow Type 1 through a steep inlet culverts. A file describing the culverts positions and characteristics must be provided by the user in TELEMAC-3D in the same way as in TELEMAC-2D.

The development of hydrodynamic models together with the atmospheric circulation models facilitate the accurate real-time forecasts of storm surges, which help to prepare for such events.

Transcritical flow and hydraulic jump The flow in a channel with a bump on the bottom ~s a well-known test problem in fluvial hydraulics.

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