scholarly journals Nitrogen retention in the main channel and two transient storage zones during nutrient addition experiments

2014 ◽  
Vol 60 (1) ◽  
pp. 57-77 ◽  
Author(s):  
Zachary C. Johnson ◽  
John J. Warwick ◽  
Rina Schumer
Keyword(s):  
Nitrogen Retention ◽  
Main Channel ◽  
Nutrient Addition ◽  
Transient Storage ◽  
Transient Storage Zones

A regression approach to estimating reactive solute uptake in advective and transient storage zones of stream ecosystems

2003 ◽  
Vol 26 (9) ◽  
pp. 965-976 ◽  
Author(s):  
Steven A. Thomas ◽  
H. Maurice Valett ◽  
Jackson R. Webster ◽  
Patrick J. Mulholland
Keyword(s):  
Transient Storage ◽  
Stream Ecosystems ◽  
Solute Uptake ◽  
Regression Approach ◽  
Transient Storage Zones

scholarly journals A comprehensive one-dimensional numerical model for solute transport in rivers

2017 ◽  
Vol 21 (1) ◽  
pp. 99-116 ◽  
Author(s):  
Maryam Barati Moghaddam ◽  
Mehdi Mazaheri ◽  
Jamal MohammadVali Samani
Keyword(s):  
Cross Sections ◽  
Pollutant Transport ◽  
Study Data ◽  
Transient Storage ◽  
Third Order ◽  
Transport Models ◽  
Storage Model ◽  
Proposed Model ◽  
Main Effect ◽  
Transient Storage Zones

Abstract. One of the mechanisms that greatly affect the pollutant transport in rivers, especially in mountain streams, is the effect of transient storage zones. The main effect of these zones is to retain pollutants temporarily and then release them gradually. Transient storage zones indirectly influence all phenomena related to mass transport in rivers. This paper presents the TOASTS (third-order accuracy simulation of transient storage) model to simulate 1-D pollutant transport in rivers with irregular cross-sections under unsteady flow and transient storage zones. The proposed model was verified versus some analytical solutions and a 2-D hydrodynamic model. In addition, in order to demonstrate the model applicability, two hypothetical examples were designed and four sets of well-established frequently cited tracer study data were used. These cases cover different processes governing transport, cross-section types and flow regimes. The results of the TOASTS model, in comparison with two common contaminant transport models, shows better accuracy and numerical stability.

scholarly journals On the Representation of Hyporheic Exchange in Models for Reactive Transport in Stream and River Corridors

2021 ◽  
Vol 2 ◽  
Author(s):  
Scott L. Painter
Keyword(s):  
Mass Exchange ◽  
Reactive Transport ◽  
Hyporheic Zone ◽  
Tracer Tests ◽  
Transient Storage ◽  
Multiscale Models ◽  
Channel Network ◽  
Streams And Rivers ◽  
Basin Scale ◽  
Transient Storage Zones

Efforts to include more detailed representations of biogeochemical processes in basin-scale water quality simulation tools face the challenge of how to tractably represent mass exchange between the flowing channels of streams and rivers and biogeochemical hotspots in the hyporheic zones. Multiscale models that use relatively coarse representations of the channel network with subgrid models for mass exchange and reactions in the hyporheic zone have started to emerge to address that challenge. Two such multiscale models are considered here, one based on a stochastic Lagrangian travel time representation of advective pumping and one on multirate diffusive exchange. The two models are formally equivalent to well-established integrodifferential representations for transport of non-reacting tracers in steady stream flow, which have been very successful in reproducing stream tracer tests. Despite that equivalence, the two models are based on very different model structures and produce significantly different results in reactive transport. In a simple denitrification example, denitrification is two to three times greater for the advection-based model because the multirate diffusive model has direct connections between the stream channel and transient storage zones and an assumption of mixing in the transient storage zones that prevent oxygen levels from dropping to the point where denitrification can progress uninhibited. By contrast, the advection-based model produces distinct redox zonation, allowing for denitrification to proceed uninhibited on part of the hyporheic flowpaths. These results demonstrate that conservative tracer tests alone are inadequate for constraining representation of mass transfer in models for reactive transport in streams and rivers.

scholarly journals Defining and measuring the mean residence time of lateral surface transient storage zones in small streams

2012 ◽  
Vol 48 (10) ◽  
Author(s):  
Tracie R. Jackson ◽  
Roy Haggerty ◽  
Sourabh V. Apte ◽  
Anthony Coleman ◽  
Kevin J. Drost
Keyword(s):  
Residence Time ◽  
Mean Residence Time ◽  
Lateral Surface ◽  
Transient Storage ◽  
Small Streams ◽  
The Mean ◽  
Transient Storage Zones

scholarly journals A comprehensive one-dimensional numerical model for solute transport in rivers

2015 ◽  
Vol 12 (11) ◽  
pp. 11959-12037
Author(s):  
M. Barati Moghaddam ◽  
M. Mazaheri ◽  
J. M. V. Samani
Keyword(s):  
Cross Sections ◽  
Pollutant Transport ◽  
Real Data ◽  
Sorption Process ◽  
Transient Storage ◽  
One Dimensional ◽  
Physical Conditions ◽  
Proposed Model ◽  
Transient Storage Zones ◽  
Physical And Chemical

Abstract. Interactions between physical and chemical mechanisms involved in pollutant transport in rivers occur with varying degrees, depending on flow discharge and physical conditions. One of the issues that greatly affect the transport, especially in small mountain streams, is transient storage zones. The main effects include temporary retention of pollutants and reduce its concentration at the downstream and indirect impact on sorption process in the streambed. This paper proposes a one-dimensional model to simulate the pollutant transport in rivers with irregular cross-sections under unsteady flow with transient storage zones. The proposed model verified with analytical solution and comparison with 2-D model. The model application shown by two hypothetical examples and four set of real data that covers different processes governing on transport, cross-section types and flow regimes. Comparing results of the model with two common contaminant transport models show good accuracy and numerical stability of the model than other ones.

scholarly journals Residence time distributions in surface transient storage zones in streams: Estimation via signal deconvolution

2011 ◽  
Vol 47 (5) ◽  
Author(s):  
Michael N. Gooseff ◽  
David A. Benson ◽  
Martin A. Briggs ◽  
Mitchell Weaver ◽  
Wilfred Wollheim ◽  
...  
Keyword(s):  
Residence Time ◽  
Transient Storage ◽  
Residence Time Distributions ◽  
Signal Deconvolution ◽  
Transient Storage Zones

scholarly journals Separation of river network-scale nitrogen removal among the main channel and two transient storage compartments

2011 ◽  
Vol 47 (10) ◽  
Author(s):  
Robert J. Stewart ◽  
Wilfred M. Wollheim ◽  
Michael N. Gooseff ◽  
Martin A. Briggs ◽  
Jennifer M. Jacobs ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Main Channel ◽  
River Network ◽  
Transient Storage ◽  
Network Scale

A conservative semi-Lagrangian transport model for rivers with transient storage zones

2001 ◽  
Vol 37 (12) ◽  
pp. 3321-3329 ◽  
Author(s):  
J. Russell Manson ◽  
Steve G. Wallis ◽  
Donna Hope
Keyword(s):  
Transport Model ◽  
Transient Storage ◽  
Lagrangian Transport ◽  
Transient Storage Zones
Sign in / Sign up

Export Citation Format

Share Document