Abstract. In cold climate regions, the formation and break-up of river ice is important for morphology, winter water supply, riparian instream ecology as well hydraulic engineering. Data on therefore significant, both to understand processes directly assess effects other systems. Ice measurement complicated due difficult site access, inherent complexity formations, potential danger involved in carrying out on-ice measurements. Remote sensing methods are highly useful, data from...

Measurement of complex natural flows, especially those occurring in rivers due to man-made structures, is often hampered by the limitations existing flow measurement methods. Furthermore, there a growing need for new devices that are capable measuring hydrodynamic characteristics flows required environmental studies use fish as an indicator ecological health. In this paper, we take first step toward <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Animal-robot studies can inform us about animal behaviour and inspire advances in agriculture, environmental monitoring health welfare. Currently, experimental results on how fish are affected by the presence of underwater robots largely limited to laboratory environments with few individuals a focus model species. Laboratory provide valuable insight, but their not necessarily generalizable larger scales such as marine aquaculture. This paper examines effects human diver large aggregation...

Fish passing downstream through hydraulic structures and turbines may be exposed to an elevated risk of injury mortality. The majority live fish studies are single-species laboratory investigations field Kaplan turbines, with a limited number in Francis screw turbines. In addition these studies, the physical conditions during turbine passage can directly measured using passive sensors. this study, we investigate multispecies mortality large Archimedes hydrodynamic for bream (Abramis brama),...

Walking underwater reduces joint impacts, enhances stability and lowers the net body weight of patient during rehabilitation. It is a recent rehabilitation method few suitable methods exist to study gait kinematics. We propose an inertial measurement (IMU) system analogous those used in land-based investigate The objective this was test validate proposed two human trials by evaluating knee angle gait. In first trial, three-way performance analysis carried out between IMU, optoelectronic...

Hydropeaking is the rapid change in water flow downstream of a hydropower plant, driven by changes daily electricity demand. These fluctuations may produce negative effects freshwater fish. To minimize these impacts, previous studies have proposed habitat enhancement structures as potential mitigation measures for salmonids. However, recommendation cyprinids remains scarce and their unknown. In this study, under simulated hydropeaking base-flow conditions are examined Iberian barbel...

Imagery collected with an unmanned aerial vehicle (UAV) in conjunction image processing provides new sources of environmental intelligence data and can be implemented river habitat studies. High-resolution RGB orthomosaic images 1 cm/px resolution are generated from acquired a UAV. Ground truth mapping the dominant substrate bottom is then used to classify each spatial region. Several texture parameters examined using techniques determine presence extent grain classes, providing method map...

Automated fish counters featuring robust, real-time computer vision capabilities can provide a cost-effective means to count migrating freshwater fish. In this work, we propose four-stage process for automatically sorting videos with and without Underwater counter challenging range of environmental conditions including clear water, biofilm growth, bubbles, turbidity, low light overexposure. To address this, our method also includes the automated classification these six conditions. The...

Abstract River system measurement and mapping using UAVs is both lean agile, with the added advantage of increased safety for surveying crew. A common parameter fluvial geomorphological studies flow velocity, which a major driver sediment behavior. Advances in fluid mechanics now include metrics describing presence interaction coherent structures within field along its boundaries. These have proven to be useful studying complex turbulent flows but require time‐resolved data, normally...

The lateral line system provides fish with advanced mechanoreception over a wide range of flow conditions. Inspired by the abilities their biological counterparts, artificial lines have been developed and tested exclusively under laboratory settings. Motivated lack measurements taken in field which consider fluid-body interactions, we built fish-shaped probe. device is outfitted 11 high-speed (2.5 kHz) time-synchronized pressure transducers, designed to capture classify flows passage...

Computational fluid dynamics (CFD) provides a powerful numerical tool to simulate and study many of the complex fluid-body interactions experienced by freshwater fish. However, major gaps remain in application CFD fish, including absence an openly available reference body geometry, lack detailed on suitable methods deficit velocity laboratory measurements for model calibration validation. To address these gaps, we provide set models based open-source toolkit OpenFOAM. The contributions this...

Abstract Globally, catadromous freshwater eels of the genus Anguilla are conservation concern, including critically endangered European eel ( anguilla ). Pumping stations that move river water to a higher elevation severely impact during their seaward spawning migration. Fish-friendly pumps can mitigate fish injury and mortality but here we uniquely rethink fish-friendly pump as passage solution. In this pluriannual study, seasonal timing operation was misaligned with typical silver...

Autonomous underwater vehicles require estimation of their velocity relative to the surrounding flow perform essential navigation tasks. Available technologies for speed rely on Doppler logs or acoustic current profilers and are not suitable application in small low cost energy consumption vehicles. Encouraged by successful results our previous lab-scale investigations using pressure-based speedometry, we developed differential pressure sensor speedometry as an alternative conventional...

We introduce the lateral line probe (LLP) as a measurement device for natural flows. Hydraulic surveys in rivers and hydraulic structures are currently based on time-averaged velocity measurements using propellers or acoustic Doppler devices. The long-term goal is thus to develop sensor system, which includes spatial gradients of flow field along fish-shaped body. Interpreting biological relevance collection point complicated by fact that fish other aquatic vertebrates experience through...

The time-averaged velocity of water flow is the most commonly measured metric for both laboratory and field applications. Its employment in scientific engineering studies often leads to an oversimplification underlying physics. In reality, complex flows are ubiquitous, arise from fluid-body interactions with man-made structures, such as bridges well natural along rocky river beds. Studying outside conditions requires more detailed information addition properties. choice situ measuring device...

The spatial distribution of fish upstream a vertical trash rack was investigated at the hydropower plant Kirchbichl in alpine River Inn (Tyrol, Austria). objective research project “FIDET” to establish non-invasive methodology study presence and flow characteristics large hydro power sites. A new monitoring approach developed combining hydroacoustic observations locations with multivariate hydrodynamic data. This accomplished by utilizing complementary from multiple underwater sensor...