Modeling Channel Response to Instream Gravel Mining

Measurable value optimization is suggested as a method of integrating ecological concerns into the planning and management of offshore sand and gravel mining.

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Ecological and environmental factors affecting the foraging activity of the White-bellied Heron Ardea insignis (Hume, 1878) in Bhutan

Bird Conservation International ◽

10.1017/s0959270920000684 ◽

2021 ◽

pp. 1-18

Author(s):

PEMA KHANDU ◽

GEORGE A. GALE ◽

SARA BUMRUNGSRI

Keyword(s):

Relative Abundance ◽

Habitat Restoration ◽

Prey Species ◽

Catch Per Unit Effort ◽

Factors Affecting ◽

Prey Biomass ◽

Gravel Mining ◽

Unit Effort ◽

Prey Preferences ◽

The Government

Summary White-bellied Heron Ardea insignis (WBH) is critically endangered, but we lack data on many aspects of its basic ecology and threats to the species are not clearly understood. The goal of this study was to analyse WBH foraging microhabitat selection, foraging behaviour, and prey preferences in two river basins (Punatsangchhu and Mangdechhu) in Bhutan which are likely home to one of the largest remaining populations of WBH. We also explored the relationship between the relative abundance of the WBH and prey biomass catch per unit effort within four foraging river microhabitats (pool, pond, riffle and run). Prey species were sampled in 13 different 100-m thalweg lengths of the rivers using cast nets and electrofishing gear. Riffles and pools were the most commonly used microhabitats; relative abundance was the highest in riffles. The relative abundance of WBH and prey biomass catch per unit effort (CPUE) also showed a weak but significant positive correlation (rs = 0.22). The highest biomass CPUE was observed in riffles while the lowest was found in the ponds. From the 97 prey items caught by the WBH, 95% of the prey were fish. The WBH mainly exploited three genera of fish (Garra, Salmo, and Schizothorax) of which Schizothorax (64%) was the most frequently consumed. This study provides evidence in support of further protection of critical riverine habitat and fish resources for this heron. Regular monitoring of sand and gravel mining, curbing illegal fishing, habitat restoration/mitigation, and developing sustainable alternatives for local people should be urgently implemented by the government and other relevant agencies. Further study is also required for understanding the seasonal variation and abundance of its prey species in their prime habitats along the Punatsangchhu and Mangdechhu basins.

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Signal Classification Algorithms over Time Selective Channels

Electronics ◽

10.3390/electronics10141714 ◽

2021 ◽

Vol 10 (14) ◽

pp. 1714

Author(s):

Mohamed Marey ◽

Hala Mostafa

Keyword(s):

Block Code ◽

Classification Problem ◽

Classification Performance ◽

Signal Classification ◽

Final Decision ◽

Time Block ◽

Channel Response ◽

Over Time ◽

Parallel Fashion

In this work, we propose a general framework to design a signal classification algorithm over time selective channels for wireless communications applications. We derive an upper bound on the maximum number of observation samples over which the channel response is an essential invariant. The proposed framework relies on dividing the received signal into blocks, and each of them has a length less than the mentioned bound. Then, these blocks are fed into a number of classifiers in a parallel fashion. A final decision is made through a well-designed combiner and detector. As a case study, we employ the proposed framework on a space-time block-code classification problem by developing two combiners and detectors. Monte Carlo simulations show that the proposed framework is capable of achieving excellent classification performance over time selective channels compared to the conventional algorithms.

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Channel response to a dam‐removal sediment pulse captured at high‐temporal resolution using routine gage data

Earth Surface Processes and Landforms ◽

10.1002/esp.5083 ◽

2021 ◽

Author(s):

Matthew J. Cashman ◽

Allen Gellis ◽

Eric Boyd ◽

Mathias Collins ◽

Scott Anderson ◽

...

Keyword(s):

Temporal Resolution ◽

Dam Removal ◽

High Temporal Resolution ◽

Channel Response

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Performance of the SoLid reactor neutrino detector

EPJ Web of Conferences ◽

10.1051/epjconf/201921908003 ◽

2019 ◽

Vol 219 ◽

pp. 08003

Author(s):

Maja Verstraeten

Keyword(s):

Quality Control ◽

Energy Resolution ◽

Neutrino Detector ◽

Channel Response ◽

In Situ Calibration ◽

Reactor Neutrino ◽

Li Isotope ◽

Better Than

The SoLid Collaboration is currently operating a 1.6 ton neutrino detector near the Belgian BR2 reactor. Its main goal is the observation of the oscillation of electron antineutrinos to previously undetected flavour states. The highly segmented SoLid detector employs a compound scintillation technology based on PVT scintillator in combination with LiF-ZnS(Ag) screens containing the 6Li isotope. The experiment has demonstrated a channel-to-channel response that can be controlled to the level of a few percent, an energy resolution of better than 14% at 1 MeV, and a determination of the interaction vertex with a precision of 5 cm. This contribution highlights the major outcomes of the R&D program, the quality control during component manufacture and integration, the current performance and stability of the full-scale system, as well as the in-situ calibration of the detector with various radioactive sources.

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Diagnosing problems induced by past gravel mining and other disturbances in Southern European rivers: the Magra River, Italy

Aquatic Sciences ◽

10.1007/s00027-015-0440-5 ◽

2015 ◽

Vol 78 (1) ◽

pp. 107-119 ◽

Cited By ~ 10

Author(s):

B. Belletti ◽

L. Nardi ◽

M. Rinaldi

Keyword(s):

Gravel Mining

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The airborne electromagnetic discovery of the Detour zinc‐copper‐silver deposit, northwestern Québec

Geophysics ◽

10.1190/1.1441266 ◽

1981 ◽

Vol 46 (9) ◽

pp. 1278-1290 ◽

Cited By ~ 2

Author(s):

L. E. Reed

Keyword(s):

Volcanic Rocks ◽

Channel Response ◽

Copper Sulfides ◽

Input System ◽

Diamond Drill ◽

Geophysical Surveys ◽

Airborne Electromagnetic ◽

Airborne Em ◽

Two Bodies

In June 1974, a diamond drill operated for Selco Mining Corp. intersected zinc‐copper sulfides in Brouillan Township in northwestern Québec. To date, two bodies have been outlined. These bodies were discovered during a ground follow‐up of a Mark VI Input® electromagnetic (EM) survey. The Input survey covered an area selected on the basis of regional geology and local outcrops of acid volcanic rocks. Conductors were identified that appeared to be associated with potentially favorable geology. They were selected for ground follow‐up. One was the discovery zone. The airborne responses over the zone were less encouraging than those often observed over highly conductive massive sulfides. The low apparent conductivity‐thickness (5 mhos) was suggestive of conductive overburden. However, the character of the profiles suggested a bedrock source. Ground geophysical confirmation identified a drill target. Subsequent to the discovery, more intensive geophysical surveys, both ground and airborne, were carried out. The best EM response suggested a confined source within a much larger mineralized halo. Weaker ground EM response from the halo correlated with the early channel response of the Input system. An airborne EM survey conducted in 1958 over the same area identified both conductive zones. However, they were not followed up. Only with later advances in exploration philosophy, geologic appreciation, and instrumentation were the conductive zones recognized as viable exploration targets.

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