Author(s): Panagiotis Prinos; Vassilios Papaioannou

Linked Author(s): Panagiotis Prinos

Keywords: Circulation; Cooling; Natural convection; Thermal siphon; Vegetation

Abstract: In this work, surface cooling of a sloping water body with shallow vegetated regions (side arms) is investigated numerically. The water body consists of three regions (a) a shallow vegetated region with horizontal bottom, (b) a sloping region with a bottom slope equal to 0.1 and (c) a deep region with a horizontal bottom. The Volume-Averaged Navier-Stokes equations together with the Volume-Averaged Energy equation are solved numerically in the vegetated region. The latter has a porosity equal to 0.85 (typical of aquatic plants found in lakes) and a length equal to the total or half the length of the shallow region. A differential cooling is applied at the top free surface with a varying heat loss rate between the non-vegetated and the vegetated region. The water body with no vegetation is also considered for validation and comparison purposes. The results (isotherms, streamlines, exchange flow rate) indicate significant vegetation effects on the flow regime, largescale circulation and the exchange flow rates.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p1092-cd

Year: 2023