Effectiveness of the electric fish fence as a behavioural barrier at a pumping station

2019 ◽  
Vol 70 (10) ◽  
pp. 1459 ◽  
Author(s):  
Leonhard Egg ◽  
Joachim Pander ◽  
Melanie Mueller ◽  
Juergen Geist
Keyword(s):  
Electric Fish ◽  
Pumping Station ◽  
Adaptive Resolution ◽  
Pumping Stations ◽  
Promising Solution ◽  
Resolution Imaging ◽  
Imaging Sonar ◽  
New Generation ◽  
Mean Current ◽  
High Fish

Dyke-based pumping stations have been linked with high fish mortalities during pumping events. Behavioural barriers like electric fish fences have been proposed as a promising solution to prevent entrainment of fish into pumps. In order to test the effectiveness of such barriers, the intake of a pumping station was equipped with a new generation electric fish fence while fish behaviour was observed with an adaptive resolution imaging sonar (ARIS) during non-electrified (reference) and electrified (treatment) operation modes. This study revealed the functionality of the fish fence as a behavioural barrier, with a fish turning rate of up to 72% at a mean water temperature of 4.3°C and a mean current velocity of 0.05ms–1. These field results suggest that new-generation electric fish fences may be a promising solution to reduce the effects of pumping stations on fish.

scholarly journals Fish assemblages associated with artificial reefs assessed using multiple gear types in the northwest Gulf of Mexico

2020 ◽  
Vol 96 (4) ◽  
pp. 655-678
Author(s):  
Jeffrey D Plumlee ◽  
Kaylan M Dance ◽  
Michael A Dance ◽  
Jay R Rooker ◽  
Thomas C TinHan ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Fish Assemblages ◽  
Abundant Species ◽  
Red Snapper ◽  
Artificial Reefs ◽  
Adaptive Resolution ◽  
Fish Traps ◽  
Resolution Imaging ◽  
Imaging Sonar ◽  
Gray Triggerfish

Quantitative surveys of fishes associated with artificial reefs in the northwest Gulf of Mexico were conducted over a 4-yr period (2014–2017). Artificial reefs surveyed were comprised of three types: concrete structures, rig jackets, and decommissioned ships. All reefs were surveyed using vertical long line (VLL), fish traps, and Adaptive Resolution Imaging Sonar (ARIS 1800). Mean fish abundance did not significantly differ using VLL [1.7 ind set –1 (SD 2.2)] among the three reef types. However, relative abundance among all fishes collected was significantly highest on rig reefs using traps [6.2 ind soak–1 (SD 3.8)], while results from sonar surveys indicated that the mean relative fish density was highest on concrete reefs [15.3 fish frame–1 (SD 26.8)]. Red snapper (n = 792), followed by gray triggerfish (n = 130), pigfish (n = 70), tomtate (n = 69), and hardhead catfish (n = 57) were the most numerically abundant species using VLL and traps; red snapper comprised 90.7% of total catch using VLL and 43.9% using traps. Mean Brillouin's diversity (HB) was highest on ships using VLL [0.41 (SD 0.14)] and highest on rigs using traps [0.87 (SD 0.58)] compared to the lowest diversity found on concrete [VLL 0.07 (SD 0.11); traps 0.36 (SD 0.32)]. Findings from this study can be used to inform the planning of future artificial reefs and their effect on the assemblages of reef-associated fishes. Additionally, these results highlight the value of using multiple gear types to survey reef fish assemblages associated with artificial reefs.

Detecting a nearshore fish parade using the adaptive resolution imaging sonar (ARIS): An automated procedure for data analysis

2017 ◽  
Vol 191 ◽  
pp. 190-199 ◽  
Author(s):  
Suzan Shahrestani ◽  
Hongsheng Bi ◽  
Viacheslav Lyubchich ◽  
Kevin M. Boswell
Keyword(s):  
Data Analysis ◽  
Adaptive Resolution ◽  
Resolution Imaging ◽  
Imaging Sonar

Adaptive Resolution Imaging Sonar (ARIS) as a tool for marine fish identification

2021 ◽  
Vol 243 ◽  
pp. 106092
Author(s):  
Robyn E. Jones ◽  
Ross A. Griffin ◽  
Richard K.F. Unsworth
Keyword(s):  
Marine Fish ◽  
Adaptive Resolution ◽  
Resolution Imaging ◽  
Imaging Sonar

scholarly journals New generation geostationary satellite observations support seasonality in greenness of the Amazon evergreen forests

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hirofumi Hashimoto ◽  
Weile Wang ◽  
Jennifer L. Dungan ◽  
Shuang Li ◽  
Andrew R. Michaelis ◽  
...  
Keyword(s):  
Cloud Cover ◽  
Seasonal Patterns ◽  
Optical Remote Sensing ◽  
Amazon Forest ◽  
Evergreen Forests ◽  
Geostationary Satellites ◽  
Moderate Resolution ◽  
Resolution Imaging ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
New Generation

AbstractAssessing the seasonal patterns of the Amazon rainforests has been difficult because of the paucity of ground observations and persistent cloud cover over these forests obscuring optical remote sensing observations. Here, we use data from a new generation of geostationary satellites that carry the Advanced Baseline Imager (ABI) to study the Amazon canopy. ABI is similar to the widely used polar orbiting sensor, the Moderate Resolution Imaging Spectroradiometer (MODIS), but provides observations every 10–15 min. Our analysis of NDVI data collected over the Amazon during 2018–19 shows that ABI provides 21–35 times more cloud-free observations in a month than MODIS. The analyses show statistically significant changes in seasonality over 85% of Amazon forest pixels, an area about three times greater than previously reported using MODIS data. Though additional work is needed in converting the observed changes in seasonality into meaningful changes in canopy dynamics, our results highlight the potential of the new generation geostationary satellites to help us better understand tropical ecosystems, which has been a challenge with only polar orbiting satellites.

Avoiding Sedimentation and Air Entrainment in Pump Sump for Wet Pit Pumping Stations

2015 ◽  
Author(s):  
Raja Abou Ackl ◽  
Andreas Swienty ◽  
Flemming Lykholt-Ustrup ◽  
Paul Uwe Thamsen
Keyword(s):  
Physical Model ◽  
Air Entrainment ◽  
Flow Patterns ◽  
Operating Conditions ◽  
Design Criteria ◽  
Flow Conditions ◽  
Pumping Station ◽  
Pumping Stations ◽  
Pump Sump ◽  
Pump Stations

In many places lifting systems represent central components of wastewater systems. Pumping stations with a circular wet-pit design are characterized by their relatively small footprint for a given sump volume as well as their relatively simple construction technique [1]. This kind of pumping stations is equipped with submersible pumps. These are located in this case directly in the wastewater collection pit. The waste water passes through the pump station untreated and loaded with all kind of solids. Thus, the role of the pump sump is to provide an optimal operating environment for the pumps in addition to the transportation of sewage solids. Understanding the effects of design criteria on pumping station performance is important to fulfil the wastewater transportation as maintenance-free and energy efficient as possible. The design of the pit may affect the overall performance of the station in terms of poor flow conditions inside the pit, non-uniform und disturbed inflow at the pump inlet, as well as air entrainment to the pump. The scope of this paper is to evaluate the impact of various design criteria and the operating conditions on the performance of pump stations concerning the air entrainment to the pump as well as the sedimentation inside the pit. This is done to provide documentation and recommendations of the design and operating of the station. The investigated criteria are: the inflow direction, and the operating submergence. In this context experiments were conducted on a physical model of duplex circular wet pit wastewater pumping station. Furthermore the same experiments were reproduced by numerical simulations. The physical model made of acrylic allowed to visualize the flow patterns inside the sump at various operating conditions. This model is equipped with five different inflow directions, two of them are tangential to the pit and the remaining three are radial in various positions relative to the pumps centerline. Particles were used to enable the investigation of the flow patterns inside the pit to determine the zones of high sedimentation risk. The air entrainment was evaluated on the model test rig by measuring the depth, the width and the length of the aerated region caused by the plunging water jet and by observing the air bubbles entering the pumps. The starting sump geometry called baseline geometry is simply a flat floor. The tests were done at all the possible combinations of inflow directions, submergence, working pump and operating flow. The ability of the numerical simulation to give a reliable prediction of air entrainment was assessed to be used in the future as a tool in scale series to define the scale effect as well as to analyze the flow conditions inside the sump and to understand the air entrainment phenomenon. These simulations were conducted using the geometries of the test setup after generating the mesh with tetrahedral elements. The VOF multiphase model was applied to simulate the interaction of the liquid water phase and the gaseous air phase. On the basis of the results constructive suggestions are derived for the design of the pit, as well as the operating conditions of the pumping station. At the end recommendations for the design and operating conditions are provided.

Design of Hydraulic Station of Crawler Hydraulic Drilling Rig

2014 ◽  
Vol 889-890 ◽  
pp. 380-384
Author(s):  
Zhi Liu ◽  
Peng Fang ◽  
Di Wu ◽  
Dong Li
Keyword(s):  
Design Process ◽  
Structural Design ◽  
Control Technique ◽  
Pumping Station ◽  
Drilling Rig ◽  
Pumping Stations ◽  
Hydraulic Station ◽  
Scheme Selection ◽  
And Control

This article describes the design process of pumping stations of crawler full hydraulic drilling rig. The principle of full hydraulic drilling rig pumping station,scheme selection, hydraulic components selection and structural design of the tank were presented. The system used double loops in which some advanced hydraulic components and control technique were adopt.

PUMPING STATION AND STAMPING MACHINE FOR THE PRODUCTION OF RADIATION SOURCES

2021 ◽  
pp. 46-51
Author(s):  
S. A. Mikaeva ◽  
A. S. Mikaeva ◽  
A. A. Dyukin
Keyword(s):  
Electrical Equipment ◽  
Production Volume ◽  
Automated Control ◽  
Working Pressure ◽  
Pumping Station ◽  
Equipment Operation ◽  
Pumping Stations ◽  
Radiation Sources ◽  
Equipment Configuration ◽  
Technical Solutions

The article describes a five-lamp pumping station and a semi-automatic stamping machine for the production of bactericidal ultraviolet lamps. Standard methods of production and testing of pumping stations and stamping machines were analyzed. In the course of work and on the basis of the conducted research, the technical characteristics and equipment configuration were worked out. The pumping station is designed for processing simultaneously five products that will later be bactericidal ultraviolet lamps, including: decontamination of products, oxidation of electrodes, filling products with a gas mixture to the working pressure, loading amalgam and desoldering. This equipment ensures the fulfillment of the production volume for the production of bactericidal lamps. When designing and manufacturing electrical equipment, components from the world's leading manufacturers are used. The use of high-quality materials can significantly increase the efficiency of equipment operation. The latest technical solutions combined with a well-thought-out design make it possible to successfully integrate this equipment into integrated automated control systems.

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