Water Resources Research
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Impact of variable reservoir releases on management of downstream water temperatures
Water Resources Research - Tập 37 Số 6 - Trang 1733-1743 - 2001
A coupled unsteady flow and heat transport model is used to determine the
impacts of fluctuating reservoir releases on downstream water temperatures.
Maintenance of stream temperatures is one of the most common reasons cited for
imposition of minimum flow requirements in regulated (reservoir controlled)
rivers. Minimum flow constraints for temperature control are typically developed
using worst‐ca...
Riverbed Temperature and Heat Transport in a Hydropeaked River
Water Resources Research - Tập 57 Số 4 - 2021
AbstractHydropeaking, the alternating storage and release of water from
reservoirs for hydropower generation, perturbs the thermal regime of many large
rivers. While its effects on river temperature have been long studied, impacts
on the thermal regime of riverbeds remain mostly unknown, despite riverbed
temperature affecting rates of nutrient cycling and habitat suitability for
benthic organisms....
Self‐organizing linear output map (SOLO): An artificial neural network suitable for hydrologic modeling and analysis
Water Resources Research - Tập 38 Số 12 - 2002
Artificial neural networks (ANNs) can be useful in the prediction of hydrologic
variables, such as streamflow, particularly when the underlying processes have
complex nonlinear interrelationships. However, conventional ANN structures
suffer from network training issues that significantly limit their widespread
application. This paper presents a multivariate ANN procedure entitled
self‐organizing l...
Mixing‐induced precipitation: Experimental study and multiscale numerical analysis
Water Resources Research - Tập 44 Số 6 - 2008
Laboratory experiments, pore‐scale simulations, and continuum (Darcy) ‐scale
simulations were used to study mixing‐induced precipitation in porous media. In
the experimental investigation, solutions containing Na2CO3 and CaCl2 were each
injected in different halves of a quasi two‐dimensional flow cell filled with
quartz sand. As a result of the in situ mixing between the two solutions, a
narrow ca...
Evolution of hydraulic conductivity by precipitation and dissolution in carbonate rock
Water Resources Research - Tập 39 Số 1 - 2003
The evolution of hydraulic conductivity and flow patterns, controlled by
simultaneous precipitation and dissolution in porous rocks, was examined in a
series of laboratory experiments. Linear flow experiments were performed in
columns of crushed calcareous sandstone by injecting different concentrations of
HCl/H2SO4 mixtures at various flow rates. The effect of simultaneous calcium
carbonate disso...
Building conceptual models of field‐scale uranium reactive transport in a dynamic vadose zone‐aquifer‐river system
Water Resources Research - Tập 44 Số 12 - 2008
Subsurface simulation is used to build, test, and couple conceptual process
models to better understand the persistence of uranium concentrations above
federal drinking water standards in a 0.4 km by 1.0 km groundwater plume beneath
the 300 Area of the U.S. Department of Energy's Hanford Site in eastern
Washington State. At this location, the unconfined aquifer and the variably
saturated lower vad...
Level set simulation of coupled advection‐diffusion and pore structure evolution due to mineral precipitation in porous media
Water Resources Research - Tập 44 Số 12 - 2008
A pore‐scale simulation technique based on level set interface tracking has been
developed for modeling coupled reactive flow and structure evolution in porous
media and fracture apertures. Advection, diffusion, and mineral precipitation
resulting in changes in pore geometries are treated simultaneously by solving
fully coupled fluid flow and reactive solute transport equations. The
reaction‐induc...
A critical evaluation of recent developments in hydrogeochemical transport models of reactive multichemical components
Water Resources Research - Tập 25 Số 1 - Trang 93-108 - 1989
Many hydrogeochemical models have appeared in recent years for simulating
subsurface solute transport. The hydrological transport of solutes can be
described by a set of linear partial differential equations, and the chemical
equilibria are described by a set of nonlinear algebraic equations. Three
approaches are currently used to formulate the problem: (1) the mixed
differential and algebraic equ...
Geochemical and boron, strontium, and oxygen isotopic constraints on the origin of the salinity in groundwater from the Mediterranean Coast of Israel
Water Resources Research - Tập 35 Số 6 - Trang 1877-1894 - 1999
In order to identify the origin of the salinity and formation of saline plumes
in the central part of the Mediterranean coastal aquifer of Israel, we
determined the elemental and boron, strontium, and oxygen isotopic compositions
of fresh and brackish groundwater (Cl up to 1500 mg/L). We distinguish between
two key anthropogenic sources: (1) sewage effluents used for irrigation with
high Na/Cl, SO...
A vortex‐based model of velocity and shear stress in a partially vegetated shallow channel
Water Resources Research - Tập 44 Số 1 - 2008
This paper presents a method for predicting the distributions of velocity and
shear stress in shallow channels with a boundary of emergent vegetation.
Experiments in a laboratory channel with model vegetation show that the velocity
profile exhibits a distinct two‐layer structure, consisting of a rapidly varying
shear layer across the vegetation interface and a more gradual boundary layer in
the ma...
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