Four‐dimensional electrical conductivity monitoring of stage‐driven river water intrusion: Accounting for water table effects using a transient mesh boundary and conditional inversion constraints

Johnson, Timothy C.; Versteeg, Roelof; Thomle, Jonathan N.; Hammond, Glenn Edward; Zachara, John M.

doi:10.1002/2014wr016129

Cited by 39 publications

(44 citation statements)

References 62 publications

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“…Differences among these microbiomes were due to relatively even proportions of homogenous and variable selection, with no evident seasonal trends in the balance between these processes. Our system is characterized by pronounced geomorphic heterogeneity in the subsurface environment that creates preferential flow paths for hydrologic mixing (Johnson et al, 2015). The presence of both homogeneous and variable selection may indicate spatial variation in surface water intrusion or local biogeochemical conditions across our sampling locations.…”

Section: Microbiome Assemblymentioning

confidence: 99%

Deterministic influences exceed dispersal effects on hydrologically‐connected microbiomes

Graham

Crump

Resch

et al. 2017

Environmental Microbiology

148

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Subsurface groundwater-surface water mixing zones (hyporheic zones) have enhanced biogeochemical activity, but assembly processes governing subsurface microbiomes remain a critical uncertainty in understanding hyporheic biogeochemistry. To address this obstacle, we investigated (a) biogeographical patterns in attached and waterborne microbiomes across three hydrologically-connected, physicochemically-distinct zones (inland hyporheic, nearshore hyporheic and river); (b) assembly processes that generated these patterns; (c) groups of organisms that corresponded to deterministic changes in the environment; and (d) correlations between these groups and hyporheic metabolism. All microbiomes remained dissimilar through time, but consistent presence of similar taxa suggested dispersal and/or common selective pressures among zones. Further, we demonstrated a pronounced impact of deterministic assembly in all microbiomes as well as seasonal shifts from heterotrophic to autotrophic microorganisms associated with increases in groundwater discharge. The abundance of one statistical cluster of organisms increased with active biomass and respiration, revealing organisms that may strongly influence hyporheic biogeochemistry. Based on our results, we propose a conceptualization of hyporheic zone metabolism in which increased organic carbon concentrations during surface water intrusion support heterotrophy, which succumbs to autotrophy under groundwater discharge. These results provide new opportunities to enhance microbially-explicit ecosystem models describing hyporheic zone biogeochemistry and its influence over riverine ecosystem function.

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Section: Microbiome Assemblymentioning

confidence: 99%

Deterministic influences exceed dispersal effects on hydrologically‐connected microbiomes

Graham

Crump

Resch

et al. 2017

Environmental Microbiology

148

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show abstract

“…Differences among these microbiomes were due to relatively even proportions of 330 homogenous and variable selection, with no evident seasonal trends in the balance between these 331 processes. Our system is characterized by pronounced geomorphic heterogeneity in the 332 subsurface environment that creates preferential flow paths for groundwater-surface water 333 mixing (Johnson et al, 2015). The presence of both homogeneous and variable selection may 334 indicate spatial variation in surface water intrusion or local biogeochemical conditions across our 335 sampling locations (distributed parallel to the river across a distance of ~150m).…”

mentioning

confidence: 99%

Deterministic influences exceed dispersal effects on hydrologically-connected microbiomes

Graham

Crump

Resch

et al. 2016

Preprint

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Originality-Significance Statement. Subsurface zones of groundwater and surface water 21 mixing (hyporheic zones) are hotspots of biogeochemical activity and strongly influence carbon, 22 nutrient and contaminant dynamics within riverine ecosystems. Hyporheic zone microbiomes are 23 responsible for up to 95% of riverine ecosystem respiration, yet the ecology of these 24 microbiomes remains poorly understood. While significant progress is being made in the 25 development of microbially-explicit ecosystem models, poor understanding of hyporheic zone 26 microbial ecology impedes development of such models in this critical zone. To fill the 27 knowledge gap, we present a comprehensive analysis of biogeographical patterns in hyporheic 28 microbiomes as well as the ecological processes that govern their composition and function 29 through space and time. Despite pronounced hydrologic connectivity throughout the hyporheic 30 zone-and thus a strong potential for dispersal-we find that ecological selection 31 deterministically governs microbiome composition within local environments, and we identify 32 specific groups of organisms that correspond to seasonal changes in hydrology. Based on our 33 results, we propose a conceptual model for hyporheic zone metabolism in which comparatively 34 high-organic C conditions during surface water intrusion into the hyporheic zone support 35 heterotrophic metabolisms that succumb to autotrophy during time periods of groundwater 36 discharge. These results provide new opportunities to develop microbially-explicit ecosystem 37 models that incorporate the hyporheic zone and its influence over riverine ecosystem function. 38 39 Keywords: hyporheic zone, selection, subsurface, microbial community structure, community 40 assembly, freshwater biology, microbial ecology, stochastic assembly 41 42 2 Summary. 43Subsurface groundwater-surface water mixing zones (hyporheic zones) have enhanced 44 biogeochemical activity, but assembly processes governing subsurface microbiomes remain a 45 critical uncertainty in understanding hyporheic biogeochemistry. To address this obstacle, we 46 investigated (a) biogeographical patterns in attached and waterborne microbiomes across three 47 hydrologically-connected, physicochemically-distinct zones (inland hyporheic, nearshore 48 hyporheic, and river); (b) assembly processes that generated these patterns; (c) groups of 49 organisms that corresponded to deterministic changes in the environment; and (d) correlations 50 between these groups and hyporheic metabolism. All microbiomes remained dissimilar through 51 time, but consistent presence of similar taxa suggested dispersal and/or common selective 52 pressures among zones. Further, we demonstrated a pronounced impact of deterministic 53 assembly in all microbiomes as well as seasonal shifts from heterotrophic to autotrophic 54 microorganisms associated with increases in groundwater discharge. The abundance of one 55 statistical cluster of organisms increased with active biomass and respiration, revealing 56 o...

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“…Significant research has been performed on segments of the Hanford Reach, particularly in the 300 Area, to understand groundwater‐surface water interactions, and its influences on contaminant plume migration, and carbon and nitrogen cycling in the river corridor (Arntzen et al, ; Bao et al, ; Chen et al, , ; G. E. Hammond et al, ; G. E. Hammond & Lichtner, ; Johnson et al, ; Liu et al, , ; Ma et al, ; Rockhold, ; Stegen et al, ; Williams et al, ; Yabusaki et al, ; Zachara et al, , ; Zhou et al, ). Groundwater modeling studies have also been performed for the Columbia River Basin to evaluate regional aquifer resource (Ely et al, ; Heywood et al, ).…”

Section: Methodsmentioning

confidence: 99%

“…E. Hammond et al, 2011;G. E. Hammond & Lichtner, 2010;Johnson et al, 2015;Liu et al, 2015Liu et al, , 2017Ma et al, 2014;Rockhold, 2013;Stegen et al, 2016;Williams et al, 2008;Yabusaki et al, 2008;Zachara et al, 2013Zachara et al, , 2016Zhou et al, 2018). Groundwater modeling studies have also been performed for the Columbia River Basin to evaluate regional aquifer resource (Ely et al, 2014;Heywood et al, 2016).…”

Section: 1029/2018wr024193mentioning

confidence: 99%

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

Shuai

Song

Hammond

et al. 2019

Water Resources Research

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Hydrologic exchange flows (HEFs) across the river‐aquifer interface have important implications for biogeochemical processes and contaminant plume migration in the river corridor, yet little is known about the hydrogeomorphic factors that control HEFs dynamics under dynamic flow conditions. Here, we developed a 3‐D numerical model for a large regulated river corridor along the Columbia River to study how HEFs are controlled by the interplays between dam‐regulated flow conditions and hydrogeomorphic features of such river corridor system. Our results revealed highly variable intra‐annual spatiotemporal patterns in HEFs along the 75‐km river reach, as well as strong interannual variability with larger exchange volumes in wet years than dry years. In general, the river was losing during late spring to early summer when the river stage was high, and river was gaining in fall and winter when river stage was low. The magnitude and timing of river stage fluctuations controlled the timing of high exchange rates. Both river channel geomorphology and the thickness of a highly permeable river bank geologic layer controlled the locations of exchange hot spots, while the latter played a dominant role. Dam‐induced, subdaily to daily river stage fluctuations drove high‐frequency variations in HEFs across the river‐aquifer interfaces, resulting in greater overall exchange volumes as compared to the case without high‐frequency flows. Our results demonstrated that upstream dam operations enhanced the exchange between river water and groundwater with strong potential influence on the associated biogeochemical processes and on the fate and transport of groundwater contaminant plumes in such river corridors.

show abstract

Four‐dimensional electrical conductivity monitoring of stage‐driven river water intrusion: Accounting for water table effects using a transient mesh boundary and conditional inversion constraints

Cited by 39 publications

References 62 publications

Deterministic influences exceed dispersal effects on hydrologically‐connected microbiomes

Deterministic influences exceed dispersal effects on hydrologically‐connected microbiomes

Deterministic influences exceed dispersal effects on hydrologically-connected microbiomes

Dam Operations and Subsurface Hydrogeology Control Dynamics of Hydrologic Exchange Flows in a Regulated River Reach

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