Results 51 to 60 of about 9,682 (276)

Working 9 to 5: Diurnal Variability in Terrestrial Invertebrate Activity Does Not Compromise Ecosystem Health Assessments in Dry Stream Channels

River Research and Applications, EarlyView.
ABSTRACT Temporary streams are impacted by climate change and other anthropogenic pressures, but fluctuating water levels complicate ecological assessments. Terrestrial invertebrate communities may enable dry‐phase assessments, but their sampling can be resource intensive.
Kieran J. Gething, Chloe Hayes, Jaime Martin, Patrycja Meadows, Judy England, Tim Sykes, Rachel Stubbington   +6 more
wiley   +1 more source

Avoiding the ‘One‐Size‐Fits‐All’ Trap in Policy‐Based Monitoring

River Research and Applications, EarlyView.
ABSTRACT Policy‐based monitoring programmes often fail to yield the information required to assess and improve policies and plans. A dominant cause of this problem is the ‘one‐size‐fits‐all’ (OSFA) trap—a failure to recognise that several, complementary types of monitoring are required to support effective policy.
Rick J. Stoffels, Ross M. Thompson
wiley   +1 more source

Recharge from glacial meltwater is critical for alpine springs and their microbiomes

Environmental Research Letters, 2021
The importance of glacier meltwater as a source of mountain-block recharge remains poorly quantified, yet it may be essential to the integrity of alpine aquatic ecosystems by maintaining baseflow in streams and perennial flow in springs.
Jordyn B Miller, Marty D Frisbee, Trinity L Hamilton, Senthil K Murugapiran   +3 more
doaj   +1 more source

Long‐Term Effects of Low‐Drop Grade Control Structures on Channel Evolution in the Yazoo River Basin

River Research and Applications, EarlyView.
ABSTRACT Channel incision is a widespread problem, especially in river basins that have an extensive history of channel alterations. Because channel incision causes large ecological and economic consequences, the prevention of continued migration of headcuts, defined as a steep change in stream gradient over a short reach, has been the focus of many ...
Nicky M. Faucheux, W. Todd Slack, Leandro E. Miranda   +2 more
wiley   +1 more source

Mechanism of Structural Evolution of Limestone of Qinghai–Xizang Plateau Under Coupling Effect of Freeze–Thaw Cycles and Hydrochemical Erosion

Geofluids
The scientific understanding of the evolution of limestone structure under the combined action of freeze–thaw cycles (F-T cycles) and hydrochemical solutions is of great significance for revealing the mechanism of frost damage generation in cold ...
Jianfei Ma, Chunchao Zhang, Xiangquan Li, Dengfei Zhang, Changchang Fu, Lei Zhang   +5 more
doaj   +1 more source

Bias in Peak Flood Discharges: Are Our Bridges and Culverts Undersized?

River Research and Applications, EarlyView.
ABSTRACT Reliable methods for peak discharge predictions at ungaged locations are required for infrastructure design and floodplain management. For decades, a standard practice in the United States has been to utilize US Geological Survey regional regression equations (StreamStats) as a singular method. However, implementation of multiple methods, such
Steven E. Yochum, Tyler Wible
wiley   +1 more source

Efficient Data Assimilation Method for Optimizing Prediction of Flow Field and Sediment Transport in Open Channel

River Research and Applications, EarlyView.
ABSTRACT Accurately predicting open‐channel flow under complex conditions remains a challenge. This study introduces a novel synergetic self‐adaptive data assimilation (DA) framework, using a proportional‐integral‐derivative (PID) controller to dynamically calibrate the bed roughness parameter ks in a shallow‐water equation model (via the momentum ...
M. Almetwally Ahmed, S. Samuel Li
wiley   +1 more source

Extended Strahler Ordering to Distinguish Mapped River Channels From Overland Flow Pathways and Consistently Compare Digital Networks

River Research and Applications, EarlyView.
ABSTRACT Digital networks are virtual representations of freshwater systems that provide important inputs to, and mapping of, river classifications, simulation models, and quantitative data analyses for policy, planning, and management. Strahler order has often been used to characterize network configuration and as a proxy indicator of river channel ...
Doug Booker, Matt Wilkins, Clare Wilkinson, Rachel Smith   +3 more
wiley   +1 more source

Mapping River Bed Topography in Whitewater Rapids Using Bathymetric LiDAR

River Research and Applications, EarlyView.
ABSTRACT Bathymetric LiDAR captures river topography efficiently for clear and shallow water, but for mountain rivers, whitewater rapids still pose challenges. This study proposes a novel method to enable the extraction of bottom returns specifically in turbulent whitewater sections.
Jan Rhomberg‐Kauert, Theresa Himmelsbach, Florian Pöppl, Lucas Dammert, Martin Pfennigbauer, Gottfried Mandlburger   +5 more
wiley   +1 more source

Hydrogeology of Gypsum formations [PDF]

International Journal of Speleology, 1996
Detailed explanation of hydrogeological characteristics of gypsum aquifers is given in various situations: deep-seated karst-confined conditions, subjacent, entrenched and denuded karst types-semi-confined, phreatic and vadose conditions.
Klimchouk A.
doaj