Estimating Water Fluxes Across the Sediment-Water Interface in the Lower Merced River, California

Zamora, Celia

doi:10.3133/sir20075216

Cited by 18 publications

(22 citation statements)

References 21 publications

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“…A previous study of a 19-mile reach of the San Joaquin River within the regional study area showed predominantly gaining conditions during an 11-month period of drought conditions during 1988-89 (Phillips and others, 1991). Temperature and waterlevel measurements made within and below the Merced River as part of this study indicated predominantly gaining conditions within the local study area (Zamora, 2006). Additionally, a water-level map that includes the regional study area ( fig.…”

Section: Water Budgetmentioning

confidence: 76%

“…Single-well hydraulic tests-slug tests-were done in 18 shallow wells in the bed and on the banks of the Merced River down-gradient from the local well transect as part of this study (Zamora, 2006). The sediments tested ranged from silty sand to well-sorted coarse sand, and computed hydraulic conductivity values ranged from 15 to 250 m/d and had a mean of 85 m/d.…”

Section: Conceptual Understanding Of Ground-water Systemmentioning

confidence: 99%

See 1 more Smart Citation

Simulation of Multiscale Ground-Water Flow in Part of the Northeastern San Joaquin Valley, California

Phillips¹,

Green²,

Burow³

et al. 2007

Scientific Investigations Report

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was used with the local model to estimate the concentration of an environmental tracer, sulfur hexafluoride, in 10 USGS transect wells near the Merced River that were sampled for this constituent. Measured and estimated concentrations in the mid-depth and deepest wells, which would be most sensitive to errors in hydraulic conductivity estimates, were consistent. The combined results of particle tracking and sulfur hexafluoride analysis suggest that most water sampled from the transect wells was recharged less that 25 years ago.

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Section: Water Budgetmentioning

confidence: 76%

Section: Conceptual Understanding Of Ground-water Systemmentioning

confidence: 99%

Simulation of Multiscale Ground-Water Flow in Part of the Northeastern San Joaquin Valley, California

Phillips¹,

Green²,

Burow³

et al. 2007

Scientific Investigations Report

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“…The confluence of the LMR with the SJR identifies river km 0. Along this study reach, the lowermost 38 river km stretch, a localized GW flow path to the river (∼ river km 23–31) with elevated GW‐SW discharge (supporting information Figure S1) has been a site for several GW‐SW interaction studies (Essaid et al, ; Phillips et al, ; Zamora, ). The site provides a unique setting for assessing river connectivity with agricultural land use (Lockhart et al, ).…”

Section: Methodsmentioning

confidence: 96%

Synoptic Sampling to Determine Distributed Groundwater‐Surface Water Nitrate Loading and Removal Potential Along a Lowland River

Pai

Villamizar

Harmon

2017

Water Resources Research

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Delineating pollutant reactive transport pathways that connect local land use patterns to surface water is an important goal. This work illustrates high‐resolution river mapping of salinity or specific conductance (SC) and nitrate ( NO3−) as a potential part of achieving this goal. We observed longitudinal river SC and nitrate distributions using high‐resolution synoptic in situ sensing along the lower Merced River (38 river km) in Central California (USA) from 2010 to 2012. We calibrated a distributed groundwater‐surface water (GW‐SW) discharge model for a conservative solute using 13 synoptic SC sampling events at flows ranging from 1.3 to 31.6 m3 s−1. Nitrogen loads ranged from 0.3 to 1.6 kg N d−1 and were greater following an extended high flow period during a wet winter. Applying the distributed GW‐SW discharge estimates to a simplistic reactive nitrate transport model, the model reproduced observed river nitrate distribution well (RRMSE = 5–21%), with dimensionless watershed‐averaged nitrate removal (kt) ranging from 0 to 0.43. Estimates were uncertain due to GW nitrate data variability, but the resulting range was consistent with prior removal estimates. At the segment scale, estimated GW‐SW nitrate loading ranged from 0 to 17 g NO3− s−1 km−1. Local loading peaked near the middle of the study reach, a location that coincides with a shallow clay lens and with confined animal feed operations in close proximity to the river. Overall, the results demonstrate the potential for high‐resolution synoptic monitoring to support GW‐SW modeling efforts aimed at understanding and managing nonpoint source pollution.

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“…Equation can be modified to account for groundwater input which can affect DO levels and hence metabolism estimates [ McCutchan et al ., ; Hall and Tank , ]. For the river stage and location of this study, we estimated that groundwater discharge constituted less than1% of the overall flow [ Zamora , ; Butler , ] and therefore neglected this input.…”

Section: Methodsmentioning

confidence: 99%

Transverse spatiotemporal variability of lowland river properties and effects on metabolic rate estimates

et al. 2014

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[1] Variability of river properties such as temperature, velocity, dissolved oxygen (DO), and light at small scales (centimeters to meters) can play an important role in the local exchanges of energy and mass. We hypothesize that significant transverse cross-sectional DO variation is observable within a river. Such variation may influence conventional singlestation metabolic rate (primary production and respiration) estimates with respect to DO probe location, and reveal important connections between physical and biogeochemical processes and their drivers in rivers. Using a mobile sensor system, we measured river properties across a bend in the lower Merced River in Central California under stationary flow conditions in April and September. Cross-sectional temperature, DO, and chlorophylla concentrations exhibited modest but significant gradients, which varied in magnitude and direction on a diel basis. The spatiotemporal variation was consistent with reach geomorphology and incident light patterns. Gross primary production (GPP), community respiration (CR 24 ), and net ecosystem production (NEP) rates estimates derived from local DO and temperature time series varied by 3-10% over the river cross section, with greater variation in late summer. The presence of transverse metabolic rate gradients in this relatively simple reach implies the existence of substantial gradients in more complex river regimes, such as those spanning distinctively different microhabitats, transient storage zones, and related distributed biogeochemical zones.Citation: Villamizar, S. R., H. Pai, C. A. Butler, and T. C. Harmon (2014), Transverse spatiotemporal variability of lowland river properties and effects on metabolic rate estimates, Water Resour. Res., 50,[482][483][484][485][486][487][488][489][490][491][492][493]

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Estimating Water Fluxes Across the Sediment-Water Interface in the Lower Merced River, California

Cited by 18 publications

References 21 publications

Simulation of Multiscale Ground-Water Flow in Part of the Northeastern San Joaquin Valley, California

Simulation of Multiscale Ground-Water Flow in Part of the Northeastern San Joaquin Valley, California

Synoptic Sampling to Determine Distributed Groundwater‐Surface Water Nitrate Loading and Removal Potential Along a Lowland River

Transverse spatiotemporal variability of lowland river properties and effects on metabolic rate estimates

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