Patterns of variation in a fluvial system

Onesti, Lawrence J.; Miller, Theodore K.

doi:10.1029/wr010i006p01178

Cited by 14 publications

(4 citation statements)

References 23 publications

(4 reference statements)

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“…Moreover, the PCA was applied on nonnormalized and normalized (with

\frac{C_{i} - μ_{i}}{σ_{i}}

, and with

\frac{C_{i}}{μ_{i}}

) forms of the selected independent parameters, where C i is an independent parameter and μ i and σ i are the mean value and standard deviation of each independent parameter i for all the selected reaches, respectively. Previous studies suggested that two to three watershed parameters stand for the dominant loadings to the principal components (Onesti & Miller, ; Sharma et al, ). The investigation here adds subsurface parameters, such as hydraulic conductivity and Quaternary deposit thickness, which are believed to be important for surface water‐groundwater interaction.…”

Section: Methodsmentioning

confidence: 99%

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

Mojarrad

Riml

Wörman

et al. 2019

Water Resources Research

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By use of numerical modeling and field observations, this work quantified the effects of catchment-scale upwelling groundwater on the hyporheic (below stream) fluxes over a wide range of spatial scales. A groundwater flow model was developed that specifically accounted for the hydrostatic and dynamic head fluctuations induced by the streambed topography. Although the magnitudes and relative importance of these streambed-induced fluxes were found to be highly sensitive to site-specific hydromorphological properties, we showed that streambed topographic structures exert a predominant control on the magnitude of hyporheic exchange fluxes in a Swedish boreal catchment. The magnitude of the exchange intensity evaluated at the streambed interface was found to be dominated by the streambed-induced hydraulic head across stream order. However, the catchment-scale groundwater flow field substantially affected the distribution of groundwater discharge points and thus decreased the fragmentation of the hyporheic zone, specifically by shifting the cumulative density function toward larger areas of coherent upwelling at the streambed interface. This work highlights the spectrum of spatial scales affecting the surface water-groundwater exchange patterns and resolves the roles of key mechanisms in controlling the fragmentation of the hyporheic zone.

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“…Moreover, the PCA was applied on nonnormalized and normalized (with

\frac{C_{i} - μ_{i}}{σ_{i}}

, and with

\frac{C_{i}}{μ_{i}}

Section: Methodsmentioning

confidence: 99%

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

Mojarrad

Riml

Wörman

et al. 2019

Water Resources Research

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show abstract

“…An analytical tool which is capable of accomplishing this task is the statistical method of factor analysis. The method has been widely used in many previous geomorphologic studies [e.g., Abrahams, 1972;Onesti and Miller, 1974;oebisemiju, 1979]. It is often used in conjunction with regression analyses to circumvent the problem of parameter interdependence.…”

Section: Relative Channel Density (Fs/d• 2) Combines Two Importantmentioning

confidence: 99%

The influence of basin morphology on groundwater outflow

Zecharias¹,

Brutsaert²

1988

Water Resources Research

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Twenty geomorphologic parameters which constitute a well-balanced representation of the area, length, elevation, form, and shape aspects of watersheds as well as the texture of their drainage networks were considered. On the basis of groundwater theory and the results of previous related studies, eight of these parameters were identified as being relevant to the process of groundwater discharge. Values of the selected parameters were obtained for representative watersheds located in a section of the Appalachian Plateaus. The data, which were generated from U.S. Geological Survey topographic maps, were then subjected to a factor analysis to assess the relative importance of the parameters with respect to their influence on groundwater outflow behavior. The analytical results and their interpretation showed that among the parameters that are related to groundwater outflow, total length of perennial streams, average basin slope, and drainage density are the ones that are most closely related to the process. The influences of these parameters on groundwater outflow behavior are independent of each other. Thus in relating groundwater outflow characteristics to basin morphology, only these parameters need be considered and the inclusion of additional parameters does not necessarily yield a better relationship and may result in redundancy. The findings of the study are consistent with existing concepts regarding base flow (or drought flow) and have been confirmed by an independent study that investigated the process based on a more mechanistic approach.

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“…These components are mutually orthogonal linear functions of the morphologic variables, such that the first component explains the greatest proportion of total variance in the data, the second component the next greatest proportion, etc. Rummel (1969) provides an excellent overview of this method and Onesti and Miller (1974) present an application in the context of fluvial geomorphology.…”

Section: Analysis Of Central Tendency and Dispersionmentioning

confidence: 99%

INTERREGIONAL COMPARISON OF ALLUVIAL STREAM CHANNEL MORPHOLOGY: GREAT PLAINS VERSUS CENTRAL LOWLANDS¹

Miller

Onesti

1988

J American Water Resour Assoc

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Stream channel development is a complicated process involving many factors. A major goal of research in fluvial geomorphology is to develop an understanding of the relations between channel form, water discharge, and sediment discharge characteristics. The concept of thresholds has been introduced as an element in fluvial processes, with the implication that the factors involved in a process might change in some way as threshold boundaries are passed. This study is focused on the extent to which a particular regional boundary represents a threshold in the process of stream channel development. Twenty‐four alluvial stream channels from the Great Plains region and 24 from the Central Lowlands region are compared with regard to the distributional form, central tendency and dispersion characteristics, and correlation structure of ten variables, including indicators of discharge, channel sediment, and channel morphology. The results suggest that these aspects of the data are very similar between the regions, except for certain differences in central tendency characteristics, which are assumed to reflect underlying differences between the regions in geology and climate. In general, the results support the idea that this regional boundary is not an effective threshold with respect to the stream channel development process, and that, therefore, stream channels develop in these environmentally distinct regions by way of a similar process.

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Patterns of variation in a fluvial system

Cited by 14 publications

References 23 publications

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

The influence of basin morphology on groundwater outflow

INTERREGIONAL COMPARISON OF ALLUVIAL STREAM CHANNEL MORPHOLOGY: GREAT PLAINS VERSUS CENTRAL LOWLANDS¹

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Patterns of variation in a fluvial system

Cited by 14 publications

References 23 publications

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

Fragmentation of the Hyporheic Zone Due to Regional Groundwater Circulation

The influence of basin morphology on groundwater outflow

INTERREGIONAL COMPARISON OF ALLUVIAL STREAM CHANNEL MORPHOLOGY: GREAT PLAINS VERSUS CENTRAL LOWLANDS1

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INTERREGIONAL COMPARISON OF ALLUVIAL STREAM CHANNEL MORPHOLOGY: GREAT PLAINS VERSUS CENTRAL LOWLANDS¹