The die-off of the long-spined sea urchin Diadema antillarum in the 1980s highlighted its crucial role as a primary grazer in tropical western Atlantic coral reefs. However, natural recovery has been slow, exacerbated by a new die-off in 2022. Interest in actively restoring D. antillarum populations …

DEME Group, a leader in offshore energy and marine infrastructure, seeks to enhance the efficiency and accuracy of cable burial operations for offshore wind farms through the development of a user-friendly trencher mobility model. This research addresses the limitations of existing models and provides …

Zee-egels spelen een cruciale rol bij het behoud van de gezondheid van Caribische koraalriffen, omdat ze grazen op algen die anders koraal zouden kunnen overgroeien. In de jaren '80 stierven zee-egels massaal, met alle gevolgen van dien. De populatie is nog altijd niet op peil, hoewel de gemiddelde zee-egel …

This study investigates the relationship between environmental factors and cetacean sightings along the southern coast of Tenerife. Over five years, data were collected during whale watching tours to assess how factors such as air temperature, visibility, wind force and swell influence the presence of …

The Dutch Caribbean is making significant strides in coral reef restoration through innovative approaches to restoring invertebrate herbivores, as presented by Alwin Hylkema of Van Hall Larenstein University of Applied Sciences and Wageningen University during the DCNA Reef Restoration Workshop. Hylkema …

Gesprek met Alwin Hylkema, marine ecoloog aan de Hogeschool Van Hall Larenstein en de Wageningen universiteit (WUR). Hij is hoofdonderzoeker en projectleider van het Diadema II project op het Caribisch eiland Saba. Daarbij herstellen ze de populatie zee-egels om het koraalrif-ecosysteem te herstellen …

Shipping activities are increasing with sea ice receding in the Arctic, leading to higher risks of accidents and oil spills. Because Arctic toxicity data are limited, oil spill risk assessments for the Arctic are challenging to conduct. In the present study, we tested if acute oil toxicity metrics obtained …

This research investigates the feasibility and design of an Universal Transition Piece (TP) grillage for Heerema Marine Contractors (HMC) to enhance the efficiency of transporting transition pieces in offshore wind projects. The study addresses the problem of designing unique TP grillages for each project, …

With space constraints onshore, strong renewable resources available far offshore and growing green hydrogen demand, far offshore green hydrogen production may be an attractive option. To assess this potential, a mixed integer quadratically constraint programming (MIQCP) optimization model was developed …

The current sea margin estimate applied in early ship design, commonly assumed 15-20% extra installed engine power, is not based on calculations, but has nonetheless become an industry standard. These sea margin estimations, applied in early ship design, are insufficiently accurate. This paper evaluates …