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Your search keyword '"3D hydraulic modeling"' showing total 3 results
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3 results on '"3D hydraulic modeling"'

1. Can energy depletion of wild atlantic salmon kelts negotiating hydropower facilities lead to reduced survival?

Author

Baktoft, Henrik, Gjelland, Karl Ø., Szabo-Meszaros, Marcell, Silva, Ana T., Riha, Milan, Økland, Finn, Alfredsen, Knut, Forseth, Torbjørn, Baktoft, Henrik, Gjelland, Karl Ø., Szabo-Meszaros, Marcell, Silva, Ana T., Riha, Milan, Økland, Finn, Alfredsen, Knut, and Forseth, Torbjørn

Abstract

Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential effects of HPPs include migration delays and associated increased energy depletion, which potentially results in increased overall mortality. We combined a detailed 3D hydraulic model with high-resolution 3D tracking of tagged kelts (length 73-104 cm) to obtain estimates of kelt movement through water. These estimates were then used in an energetics model to estimate hourly energy expenditure while negotiating the HPP area. Hourly kelt energy expenditure varied between 0.8 and 10.1 kJ × h-1 and was dependent on kelt length. Degree of additional energy depletion can amount to several percent of remaining energy content (our study indicates 4-5 percentage points) potentially leading to reduced post-spawning survival. In turn, this can nullify the iteroparous breeding strategy and jeopardize long-term stability and persistence of Atlantic salmon populations inhabiting HPP rivers.

Published
2020

2. Field Study of an Innovative Sediment Capture Device: Bottom Grid Structure.

Author

He, Cheng, Post, Yvonne, Rochfort, Quintin, and Marsalek, Jiri

Subjects
FIELD research, SEDIMENTATION & deposition, PARTICLE removal (Water purification), PONDS, URBAN runoff management, EQUIPMENT & supplies, MANAGEMENT
Abstract

An innovative device for enhancing particle settling, referred to as the bottom grid structure (BGS), was tested in the forebay of an urban stormwater detention pond in two design variants. Results showed that compared to the simulated bare pond bottom (i.e., a reference condition), the BGSs collected more sediments during a three-month test period and also captured and retained some very fine particles (<32 μm) even under high flows. The improvements of particle removal rates expressed in multiples of removals for the bare bottom were 3.6, 7.3, and 11.2, respectively, for the particle size ranges 106 μm < D < 250 μm, 32 μm < D < 106 μm, and D < 32 μm. Because the BGS can retain much smaller particles than bare bottom sediment traps, the application of the BGS can be considered as equivalent to increasing the settling area of a particle removal facility about 5 to 60 times, depending on the size of settleable particles under consideration. This characteristic distinguishes the BGS from other sedimentation enhancement methods and makes it possible to treat stormwater with a wide particle size spectrum under high flow rates, with a relatively small footprint, and without using chemical settling aids or filtration. [ABSTRACT FROM AUTHOR]

Published
2014
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3. Can Energy Depletion of Wild Atlantic Salmon Kelts Negotiating Hydropower Facilities Lead to Reduced Survival?

Author

Finn Økland, Marcell Szabo-Meszaros, Knut Alfredsen, Karl Øystein Gjelland, Henrik Baktoft, Torbjørn Forseth, Ana T. Silva, and Milan Riha

Subjects
0106 biological sciences, Geography, Planning and Development, lcsh:TJ807-830, lcsh:Renewable energy sources, Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 [VDP], Management, Monitoring, Policy and Law, energetics model, anthropogenic structures, 010603 evolutionary biology, 01 natural sciences, 3d tracking, energy expenditure, Semelparity and iteroparity, Hydropower, lcsh:Environmental sciences, lcsh:GE1-350, Energy depletion, Renewable Energy, Sustainability and the Environment, business.industry, 010604 marine biology & hydrobiology, lcsh:Environmental effects of industries and plants, Energetics, Lead (sea ice), river connectivity, Fishery, lcsh:TD194-195, Energy expenditure, 3D hydraulic modeling, high-resolution 3D telemetry, Energy density, Environmental science, business
Abstract

Repeat spawners constitute an important component of Atlantic salmon populations, but survival of post-spawning individuals (kelts) are often compromised by anthropogenic structures such as hydropower plants (HPPs). Potential effects of HPPs include migration delays and associated increased energy depletion, which potentially results in increased overall mortality. We combined a detailed 3D hydraulic model with high-resolution 3D tracking of tagged kelts (length 73&ndash, 104 cm) to obtain estimates of kelt movement through water. These estimates were then used in an energetics model to estimate hourly energy expenditure while negotiating the HPP area. Hourly kelt energy expenditure varied between 0.8 and 10.1 kJ &times, h&minus, 1 and was dependent on kelt length. Degree of additional energy depletion can amount to several percent of remaining energy content (our study indicates 4&ndash, 5 percentage points) potentially leading to reduced post-spawning survival. In turn, this can nullify the iteroparous breeding strategy and jeopardize long-term stability and persistence of Atlantic salmon populations inhabiting HPP rivers.

Published
2020
Full Text
View/download PDF

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