Results 121 to 130 of about 6,203 (287)

Flocculation and Transport of Mud in Rivers and Deltas

Mud (grains < 62.5 μm) dominates the sediment load of rivers from continents to the ocean and contributes to building coastal land and sequestering organic carbon. However, predicting mud transport is challenging because flocculation causes mud grains
Nghiem, Justin A.
core   +1 more source

Environmental control of drilling mud discharge through dewatering in cold weather climates: Effect of ambient temperature

, 1998
This paper presents results of an experimental study into the effect of drilling mud temperature upon dewatering performance. Three temperature ranges were considered: from flowline temperature to room temperature, from room temperature to freezing point,
Ye, Y., Wojtanowicz, A. K.
core   +1 more source

Lessons Learnt From Long‐Term Monitoring of River Restoration in an English Chalk Stream

River Research and Applications, EarlyView.
ABSTRACT River restoration can be difficult to evaluate due to insufficient monitoring over timescales too short to adequately capture physical and ecological response. To better understand restoration outcomes, this study quantified changes in physical habitat (depth, velocity, substrate composition) and macroinvertebrates at two restoration projects ...
Lewis A. Dolman, Andrew S. Vowles, Paul S. Kemp   +2 more
wiley   +1 more source

Development of Solid Control System on 5 000 m Desert Rig

Shiyou jixie, 2018
The solid control system on the 5 000 m desert rig has the common problems of poor system redundancy performance, poor zero discharge system and incapability of quick assembling and disassembling.
Zhang Hushan, Lu Junkang, Liu Yuanbo, Jiang Xiaogang, Liu Xiaofeng   +4 more
doaj  

Meander‐Bend Erosion Dynamics Along a Gravel‐Bed River: Insights From Short‐Term UAV Monitoring

River Research and Applications, EarlyView.
ABSTRACT Riverbank erosion is a natural process in meandering rivers that contributes to sediment supply and geomorphic diversity, yet it can threaten infrastructure and human activities within the floodplain. Recently, many studies have used high‐resolution remote sensing technologies to measure bank erosion, but they often focus on technical aspects ...
Katarina Pavlek, Mateo Gašparović, Tomáš Galia   +2 more
wiley   +1 more source

Autonomous dredging of mud

, 2015
There are many locations where the accumulation of mud poses a problem. In lakes it can have a negative influence on the ecological situation and in port basins it can hinder traffic.
Swart, R.N. (author)
core  

Geomorphic Effects and Habitat Impacts of Large Wood at Restoration Sites in New England

River Research and Applications, EarlyView.
ABSTRACT Large wood (used interchangeably with the term “instream wood”), which refers to trees, logs and other wood within a channel, is beneficial to river ecosystems and is being used more frequently as a component of river restoration projects. We identified metrics to evaluate the effectiveness of large wood to promote ecological and geomorphic ...
Audrey J. Turcotte, Noah P. Snyder, Mathias J. Collins   +2 more
wiley   +1 more source

Distribution Path Planning of Mud System in Offshore Drilling Operations

Shiyou jixie
As offshore drilling advances towards environmental protection， safety and efficiency， drilling fluid services need to meet higher performance requirements.
Zhou Bo, Zhang Yi, Han Jinkun, Huang Lei, Wang Jintang, Hou Lin, Zhang Hang   +6 more
doaj  

Hydropower Operations Reduce Alluvial Nesting Habitat and Alter Riverine Turtle Population Demographics

River Research and Applications, EarlyView.
ABSTRACT Hydropower management has altered discharge regimes of large rivers worldwide, reducing sediment mobilization and early‐seral conditions essential for many riverine species. Spiny softshell turtles (Apalone spinifera) rely on alluvial habitats for nesting and may serve as sentinel species to assess the effects of regulated flow regimes and ...
Kayhan Ostovar, Larissa Saarel, Joanna‐Lynn C. Borgogna, Luke Ward, Whalen Alston, Matt Prinkki, Addison Valdez   +6 more
wiley   +1 more source

Research on the gas-liquid-solid coupled slag discharge flow field and optimization of cutterhead slag suction port in shaft drilling

Meitan xuebao
Aiming at the problems of gas lift reverse circulation shaft washing slag discharge and low drilling efficiency in the application of vertical shaft drilling method in the Jurassic strata coal mines in western China, taking ϕ4.2 m advanced drilling of ...
Hua CHENG, Longhui GUO, Zhishu YAO, Guang YANG, Chuanxin RONG   +4 more
doaj   +1 more source