Disputation: Eli Børve
Doctoral candidate Eli Børve at the Department of Geosciences, Faculty of Mathematics and Natural Sciences, is defending the thesis Tides and Transport: Application to Lofoten and Vesterålen, Northern Norway for the degree of Philosophiae Doctor.
Eli Børve. Photo: Yngve Vogt/Apollon
The PhD defence and trial lecture are fully digital and streamed using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.
The importance of tides for ice shelf melt in Antarctica
Conferral summary (in Norwegian)
I mange norske kystområder er tidevannet en viktig pådriver for bevegelser i vannet. Selv om tidevannet i all hovedsak beveger vannet frem og tilbake (som i sum er like langt) kan tidevannet i møte med kysten eller havbunnens topografi også generere mer ensrettede tidsmidlede strømmer og flukser, og på den måten være en viktig komponent for transport av partikler, som for eksempel fiskeegg og -larver, næringsstoffer, samt søppel og forurensing. Avhandlingen viser viktigheten av de tidevannsgenererte «transportårene» i havområdet rundt Lofoten og Vesterålen, som har viktige gyteområder for den nordøstarktiske torsken eller skrei på folkemunne.
Main research findings
Popular scientific article about Børve’s dissertation:
Tides and Transport: Application to Lofoten and Vesterålen, Northern Norway
Tides are important drivers for the motion in many coastal seas. While tides mainly move water back and forth, the interaction between tidal currents and topography might induce residual currents and fluxes, providing an important transport component. The coastal sea around Lofoten and Vesterålen is an area where strong tidal currents interact with complex coastlines and topography. However, the tidally-induced transport has gained little attention.
The coastal sea around Lofoten and Vesterålen is the main spawning ground for the Northeast Arctic cod, the most important species in Norwegian fisheries. The recruitment of this fish stock depends on ocean currents transporting eggs and larvae to its nursing ground in the Barents Sea. Thus, to identify vulnerable areas and predict fish recruitment for sustainable fisheries management, understanding the processes determining transport pathways is vital.
This thesis shows the importance of tidally-induced transport in Lofoten and Vesterålen. The thesis comprises theoretical and model studies investigating different transport processes and a comparison study on particle transport with and without tides. The results show that tides largely impact the particle transport in the region, both by increasing the transport from a spawning-ground in Vestfjorden to the shelf and by influencing which routes the particles take.
Photo and other information:
Press photo: Eli Børve, portrait; 1000px. Photo: Yngve Vogt/Apollon
Other photo material: Figure with description and credit as specified in the article above, size 1600px.