12/6/2023 0 Comments Dredge define![]() ![]() The results identified dredge fishing grounds for great scallop ( Pecten maximus) in the western part of the Bay of Brest and provided high-resolution information for scientists and local decision makers on the spatial and temporal seasonal variability of fishing effort. ![]() The test was conducted in the Bay of Brest (France) in partnership with a committee of local fishers. ![]() The performance of the approach was evaluated in terms of correct discrimination between fishing and non-fishing activities for known fishing positions as well as appropriate error propagation. This study focuses on mapping dredge gear fishing grounds using fishing effort estimates at the métier level based on automatic identification system (AIS) data. The use of satellite-based vessel monitoring system (VMS) data is constrained by data access restrictions as well as rather coarse data resolution. High resolution estimates of bottom towed fishing gears are needed to provide relevant information for natural resource management, impact assessment and maritime spatial planning. Usage of the toolboxįirst of all the user needs to make a Delft3D-FLOW model, with the sediment option enabled and sediment fractions defined.Damien Le Guyader 1 *, Cyril Ray 2, Françoise Gourmelon 1 and David Brosset 2ĬNRS LETG-Brest, European Institute for Marine Studies, University of Western Brittany, This toolbox is a convenient way to define such discharge points. The basic idea is that you introduce discharge locations inside the model domain which during certain time periods become active, resulting in an amount of discharge with a certain concentration level. One of the environmental impacts of dredging plumes are the increased suspended sediment concentration levels. A high sediment concentration in the water column can have negative impact on nature. Dredge tracks can be modeled with Delft3D. Especially fine sediment can stay in suspension for a long time and cover wide areas. Dredge plumes originate from the spillage of dredged material. ![]()
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