NANO REGIONAL PROJECTS Observa on and numerical simula on of coastal hydrdynamics (flow) at selected study sites in Ivory Coast, Tunisia and Brazil Progress of the NANO Africa Nearshore Hydrodynamics Group (NHG) project 1
Dr. Houssem Sme , Dr. Abdelfa ah Atoui2, Dr. Ted Wango3, Dr. Elysée Toualy4, Dr. Sebas an Krieger5 and Dr. Christo Rautenbach6 1
Postdoctoral Scholar, Na onal Ins tute of Marine Sciences and Technologies (Tunisia), Mediterranean Ins tute of Oceanography (France) Wikipage: h p://www.nf-pogo-alumni.org/~Houssem+Sma 2 Engineer, Department of Urban Hydraulic, Tunisia Wikipage: h p://www.nf-pogo-alumni.org/~Abdelfa ah+Atoui 3 Researcher, University of Cocody-Abidjan, Ivory Coast Wikipage: h p://www.nf-pogo-alumni.org/~Ted+Wango 4 Teacher, University of Cote d’Ivoire, Ivory Coast Wikipage: h p://www.nf-pogo-alumni.org/~Elisee+Toualy 5 Postdoctoral Scholar, University of São Paulo, Brazil Wikipage: h p://www.nf-pogo-alumni.org/~Sebas an+Krieger 6 NANO Friend, Researcher, Council for Scien fic and Industrial Research, South Africa
Observa on work During the 2015 project the NANO Nearshore Hydrodynamics Group (NHG) began its observa onal work by deploying the equipments acquired during the 2014 project. Despite difficult field work condi ons, two de-wave gauges were successfully deployed in May off the coast of Jerba island on the southeastern Tunisian coast, and at the entrance of the Viridi channel off the coast of Abidjan in Ivory Coast (Figure 1). The sensor was recovered from Tunisia in October and a 109 day-long me-series of wave parameters, depth and pressure fluctua ons was retrieved. A portable weather sta on was also installed in July, by the project par cipants in Ivory Coast, near the de-wave gauge mooring site in Abidjan harbour (Figure 2). Technical issues encountered during the setup of the portable weather sta on prevented project par cipants in Tunisia from deploying their weather sta on. These technical issues are currently being addressed with the weather sta on manufacturer. Nevertheless, a two-month long me-series of wind speed and direcon, concurrent with the de-wave gauge deployment period, was obtained from the Tunisian Na onal Ins tute of Meteorology. The me-series of the significant wave height and water column depth obtained at the Tunisian study site is presented in Figure 3. A harmonic analysis applied to the pressure-derived sea level me-series showed that the dominant dal harmonic cons tuent in the Gulf of Gabes was the semi-diurnal cons tuent (M2), with an amplitude of 30.9 ± 0.70 cm and a phase rela ve to UT of 72.85 ± 1.14 degrees. Applica on of Del 3D to flow simula on (DELFT-FLOW) In addi on to the descripon of the hydrodynamic and meteorological condi ons at the selected study sites, the me-series data from the observa onal equipment were used (along with bathymetric xyz data) to ini alize and prescribe boundary condi ons for DELFT-Flow (hydrodynamic engine) numerical model. The simula on results for the current and the sea level are presented for Ivory-Coast, Tunisia and Brazil (Figure 4). The progress made in the modeling work was made possible by the par cipa on of NHG members in the internaonal workshop “Introduc on Figure 1 - Deployment of the RBR/D-Wave sensor off (top) the northern coast of Jerba island, Tunisia to numerical modeling with and (bo om) the coast of Abidjan, Ivory Coast. (Photo credits to H. Sme , T. Wango and E. Toualy) Contact us: tedwango10@gmail.com, info@nf-pogo-alumni.org, lilian.krug@nf-pogo-alumni.org NANO website: www.nf-pogo-alumni.org
11
