Enhanced Understanding of Sediment Phosphorus Dynamics in River Systems with a Simple Supplemental Mass Balance Tool

Chomat, Catherine J.; Westphal, Kirk

doi:10.1061/(asce)ee.1943-7870.0000613

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…For instance, the P distribution between overlying water and bed sediment is regarded as a constant parameter in the EPA’s HSPF water quality model, which could not accurately characterise the complex transport process of P at the sediment–water interface. Chomat and Westphal (2013) proposed a mass balance tool to better understand P dynamics in river systems. The mass transfer coefficient between overlying water and sediment (s) varies only with the oxygenation level in the overlying water column, and it is defined as s = SOD/DO, where SOD is the sediment oxygen demand, and DO is the dissolved oxygen level in the water column.…”

Section: Discussionmentioning

confidence: 99%

Effect of flow velocity on phosphorus uptake by bed sediments

Cheng

Zhu

2019

Water & Environment J

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The transport, transformation and ultimate fate of phosphorus (P) in river systems are significantly influenced by hydrodynamic conditions. To investigate the effect of flow velocity on the P uptake by bed sediments, a series of laboratory experiments are carried out in an incubator shaker and an annular flume. The results showed a much longer equilibrium time and a slower rate of P uptake by bed sediments in the flume than those in batch experiments. The process of P uptake by bed sediments was divided into two stages: (i) in the first 24 h, the amount of P uptake increased with the increasing flow velocity and (ii) after 24 h, flow velocity had no significant effect on P uptake by bed sediments. The amount of P uptake appeared fluctuating over different velocities. The paper presents a linear relationship between the P fraction in the bed sediments and the square root of time lapsed, which indicates that the diffusional process of P from water column to bed sediments is the dominant process in controlling the P uptake by bed sediments. The slope and intercept of the regression line were controlled by the flow velocity. Of the two models used to describe the process of P uptake by bed sediments, the Elovich Equation appeared to be better than the boundary layer model due to its ability to distinguish the different uptake rates at different flow velocities.

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Section: Discussionmentioning

confidence: 99%

Effect of flow velocity on phosphorus uptake by bed sediments

Cheng

Zhu

2019

Water & Environment J

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“…The oxygenated surface waters maintain a thin aerobic layer where iron oxidation occurs and a thicker anaerobic layer dominated iron hydroxide reduction. In the current calculations, the thickness of aerobic layer is set as 1 cm, and 10 cm for the anaerobic layer (estimated from Chomat and Westphal, 2013). Sensitivity analyses showed no dependence of the conclusions on the aerobic thickness over the range of 0.1 cme1 cm.…”

Section: R2 ¼ Askmentioning

confidence: 99%

Mathematical model for interactions and transport of phosphorus and sediment in the Three Gorges Reservoir

2015

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“…In addition to water balance, land use impacts water quality, especially sediment loading from uncontrolled urban runoff and soil erosion in the watersheds [18][19][20][21][22]. Stream sediment loads influence water quality, aquatic geochemistry [23], aquatic habitats [24], channel morphology, and downstream habitat [25][26][27][28]. Hence use of lakes and streams for drinking water supply and other designated applications is impacted by turbidity caused by high suspended sediment loads.…”

Section: Introductionmentioning

confidence: 99%

“…Although studies have investigated possible watershed impacts of land-use change on streamflow and nutrients [26,54,55], there is a further need for studies on the possible effects of long-term future land-use change scenarios on water quality and quantity in semi-urban watersheds undergoing rapid changes. Therefore, in this study, the hydrological response of a semi-urban watershed SuAsCo (Sudbury-Assabet and Concord), located in eastern Massachusetts, on the east coast of the USA, is investigated in response to future land-use change.…”

Section: Introductionmentioning

confidence: 99%

“…Nutrients enter these rivers from nonpoint sources carried by stormwater runoff and point sources such as discharge from wastewater treatment plants. In addition, during the past century, land use changes in the SuAsCo watershed have altered basin hydrology, sediment, and nutrient load that is detrimental to the ecology and societal significance of water resources in SuAsCo [26,59].…”

Section: Introductionmentioning

confidence: 99%

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Long-term effects of land-use change on water resources in urbanizing watersheds

Talib

Randhir

2023

PLOS Water

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The changes in energy balance resulting from land-use change may significantly affect the amount and timing of water loss to the atmosphere as evapotranspiration (ET). Also, these will impact water fluxes in the watershed system, influencing runoff rate, flow volume, intensity, and frequency of floods. During the past century, land-use change in the SuAsCo (Sudbury-Assabet and Concord) watershed has altered basin hydrology, sediment, and nutrient load that is detrimental to water resources in SuAsCo. This study uses an integrated physically-based model Hydrological Simulation Program-FORTRAN (HSPF), along with Land Transformation Model (LTM), to assess predicted temporal and spatial changes in water, nutrient, and sediment yields for future land-use scenarios of 2035, 2065, and 2100. Results showed that a 75% increase in effective impervious area and a 50% decrease in forest area in 2100 (from 2005 baseline levels) are projected to cause a 3% increase in annual streamflow and a 69% increase in total yearly mean surface runoff. The average annual total suspended solid (TSS) yield at the watershed outlet is estimated to increase by 54% in 2100. An increase of 12% and 13% concentrations of average annual total phosphorus (TP) and total nitrogen (TN) are predicted by 2100 due to urban expansion and increased runoff volume. This integrated modeling approach will inform watershed managers and landowners about critical areas of the SuAsCo watershed to apply best management practices (BMPs) to mitigate the effects of land-use land cover (LULC) change.

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Enhanced Understanding of Sediment Phosphorus Dynamics in River Systems with a Simple Supplemental Mass Balance Tool

Cited by 4 publications

References 10 publications

Effect of flow velocity on phosphorus uptake by bed sediments

Effect of flow velocity on phosphorus uptake by bed sediments

Mathematical model for interactions and transport of phosphorus and sediment in the Three Gorges Reservoir

Long-term effects of land-use change on water resources in urbanizing watersheds

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