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The recently constructed Besseke’s flood drain is always filled with water due to individual or combined effect of the tide, urbanization drainage, underground plumes and precipitations runoffs. This study focused on the analysis of small scales dynamics inferred from short term tidal measurements to mitigate the daily flooding in the Besseke’s flood drain. The methodology used is based on field measurements observation. The sampling of water level was conducted during two (02) different tidal regimes in May 2019. The volume of brackish water moving in and out of the Besseke’s flood drain was calculated using the formula of O’Brien. The results showed that Spring conditions had greater amplitudes than Neap tide conditions. During Spring tides, the tidal prism that passed in the midsection of the Besseke’s flood drain (S4) was 3.5 × 101 m3. This means that only a negligible amount of the incoming brackish water reaches the Besseke’s flood drain, amplifies and causes the daily flooding. The unexpected stronger amplitudes and dynamics observed in S4 could be due to its sub estuary nature. Furthermore, the percentage composition of water in this section, showed that the fraction of brackish water changes from 85.7% during Spring tide to 77.8% in the Neap tide conditions. The overall spatial evolution revealed that, the trend in tidal prism (during Spring conditions) was (S0) > (S2) > (S1) > (S3) > (S4) with corresponding values of 2.1 × 104, 1.3 ×104, 1.0 × 104, 2.5 × 102 and 3.5 × 101 m3 respectively. Finally, Tidal prism and Cross-sectional area showed a perfect correlation (r2 = 0.96). The best fitted Cross-sectional area-Tidal prism relationship was obtained in S3 (Market) during Spring tide condition.
Resio DT, Westerink JJ. Modeling the physics of storm surges, Phys. 2008; 61:38.
Pugh DT, Wiley J, Chichester and Sons. Tides, Surges, Mean Sea-Level. A handbook for engineers and scientiste. 1987;472.
Zheng F, Westra S, Sisson SA. Quantifying the dependence between extreme rainfall and storm surge in coastalzones, J. Hydrol. 2013;505:187.
Torres JM, Bass B, Irza N, Fang Z, Proft J, Dawson C, Kiani M, Bedient P. Characterizing the hydraulic interactions of hurricane storm surge and rainfall – runoff for the Houston – Galveston region, Coast. Eng. 2015;106:19.
Olbert A, Comer J, Nash S, Hartnett M. High-resolution multi-scale modeling of coastal flooding due to tides, storm surges and rivers inflows. In Cork City example, Coast. Eng. 2017;121:278-297.
Leone F, Meschinet de richemond N, Vinet F. Natural hazards and risk management, Paris - PUF. 2010;287.
Ngo-Tu. Environmental assessment of the risk of flooding in the Ha Thanh river delta (central Viet-Nam). University of Orlans, Doctoral School of Man and Society, CEDETE Laboratory. 2014; EA1210:316.
Olinga OJM. Vulnerability of urban spaces and local strategies for sustainable development. Case study of the city of DOUALA (Cameroon). Douala (CMR): Research Laboratory. Planning and Sustainable Development-UDla. 2011;161.
Munji CA, Mekou YB, Monica E, Idinoba,, Denis JS. Floods and mangrove forests, friends or foes? Perceptions of relationships and risks in Cameroon coastal mangroves, Estuarine, Coastal and Shelf Science. 2013;140:75.
Feumba R. Hydrology and evaluation of the vulnerability of aquifers in the Besseke watershed (Douala, Cameroon), These presented and supported with a view to obtaining a Doctorate / PhD. In Earth Sciences, Option: Geology of superficial formations, Laboratory of Engineering Geology and Alterology, University of Yde I. 2015;277.
Sonè Essoh Willy. Mapping of areas at risk of flooding in the Tongo-Bassa watershed in Douala. Research Master thesis in Environmental and Fisheries Resources Management. Doctoral School of Basic and Applied Sciences of the University of Douala, Cameroon. 2018;73.
Onguéné R, Penha J, Dupehait Y, Esturnel C, Marsaleix P, Duhaut T. Overview of tide characteristics in Cameroon coastal areas using recent observations. Open Journal of Marine Science. 2014;5:13.
Kana TW, Hayter EJ, Work PA. Mesoscale sediment transport at southeastern U.S. tidal inlets: Conceptual model applicable to mixed energy settings. Journal of Coastal Research. 1999;15(2):313.
Olivry JC, Hoorelbecke R, Andiga J. Quelques mesures complémentaires de transports solides en suspension au Cameroun. Technical Report, Orstom, Yaounde; 1974.
Olivry JC. Fleuves et rivières du Cameroun. Monographies hydrologiques ORSTOM. 1986;9.
Marcel SJF, Rakhorst RD. Review of empirical relationships between inlet cross-section and tidal prism. Journal of Water Resources and Environmental Engineering. 2008;23:08.
Hume TM, Schwartz M. Tidal prism (eds) Encyclopedia of Coastal Science. En-cyclopedia of Earth Science Series. Springer, Dordrecht. 2005;1197.
Shenguang F. Analysis of tidal prism evolution and characteristics of the Lingdinyang Bay at Pear river estuary. 2015;10.
Seaburgh. Hydynamics of tidal inlets. Coastal engineering manual. US Army corps of engineerings, Washintong D.C. 2002;79.
Leconte LJ. Discussion of Notes on the Improvement of River and Harbor Outlets in the United States Paper No. 1009 by D.A. Watts, Transactions, American Society of Civil Engineers, LV. De.1905; 308.
O’Brien M P. Estuary tidal prisms related to entrance areas. Civil Engineering. 1931; 1(8):739.
O’Brien MP. Equilibrium flow areas of inlets on sandy coasts. Journal Waterways and Harbors Division, New York. ASCE. 1969;52.
Jarrett JT. Tidal prism-inlet area relationships. Fort Belvoir, Virginia and Vicksburg, Mississippi: U.S. Army Corps of Engineers, Coastal Engineering Center and Waterways Experiment Station, GITI Report #3. 1976;76.
Thomas L, Tandon A, Mahadevan A. Submesoscale processes and dynamics. In M.W.Hetch and H.Hasumi (Eds.), Ocean modelling in an eddying regime, Geophysicacl monograph series. American Geophysical Union, Washington DC. 2008;177:38.
Marcel JF, Stive, Liang Ji, Ronald L. Brouwer, J. (co) Van de Kreeke and Roshanka Ranasinghe. Empirical relation-ship between inlet cross-section and tidal prism: A Re-evaluation. 2010;10.
Tran TT, Jacobus VK, Marcel JFS, Dirk-Jan RW. Cross-sectional stability of tidal inlets: A comparison between nu,erical and empirical approaches. Journal of Coastal Engineering.Coastal Engineering. 2012; 60:21-29.
Powell MA, Thieke RJ, Mehta AJ. Morphodynamic relationships for ebb and flood delta volumes at Florida’s entrances. Ocean Dynamics. 2006;307.
Heath RA. Stability of some New Zealand coastal inlets. New Zealand Journal of Marine and Freshwater Research. 1975;9: 459.
Koutitonsky V. Oceanographic sensors for the system of environmental monitoring of the Autonomous Harbour of Douala. Technical report, Hydrosoft SA. 2005;63.
Matte P, Secretan Y, Morlin J. Temporal and spatial variability of tidal-fluvial dynamics in the St Lawrence fluvial estuary: An application of nonstatioary analysis. Jornal of Geophysical Researche: Oceans. 2014;119.
Le Floch JF. Propagation of the tide in the Seine estuary and in Seine-Maritime. Thesis from the University of Paris. 1961; 507.
Kouandji BJB. Coastal ocean dynamics of the Gulf of Guinea by 3D modeling. European University Editions. International Market Service Book. Ltd. 2018;37.
Sandbach SD, Nicholas AP, Ashworth PJ, Best JL, Keevil CE, Parsons DR, Prokocki EW, Simpson CJ. Hydrodynamic modelling of tidal-fluvial flows in a large river estuary. Estuarine, Coastal and Shelf Science. 2018;212:188.
Godin G. The propagation of tides up rivers with special considerations on the Upper Saint Lawrence River, Estuarine Coastal Shelf Sci. 1999;48(3):324.
Helsby R, Carl Amos L, Georg Umgiesser. Tidal prism variation and associated channel stability in the N Venice Lagoon. Scientific Research and safeguarding of Venice, Edition: 2008;4:466.
Xu FJ, Zhu SK, Wang H. Analysis of Hydrodynamic Environment of Lingdingyang Bay and Improvement Strategy. Pearl River (in Chinese). 2004; (1):14.
Terry M. Hume, Charles E. Herdendorf. The “Furkert‐Heath” relationship for tidal inlet stability reviewed, New Zealand Journal of Marine and Freshwater Research. 1988;22(1):134.
Shigemura T. Tidal prism-throat area relationships of the bays of Japan. Shore and Beach. 1980;48(3):35.
Van de Kreeke J. Adaptation of the Frisian inlet to a reduction in basin area with special reference to the cross-sectional area of the inlet channel. In Dronkers, J. and Scheffers, M.B.A.M. (Eds). Proc. PECS Conference. 1998;362.
D’Alpaos A, Lanzoni S, Marani M, Rinaldo A. On the tidal prism–channel area relations, J. Geophys. Res. F01003. 2010; 115.