Oscillatory Slug‐Test Data Sets: A Comparison of Two Methods

Weight, Willis; Wittman, Gregory P.

doi:10.1111/j.1745-6584.1999.tb01181.x

Cited by 12 publications

(8 citation statements)

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“…Oscillatory response occurs because of higher transmissivities, longer water column lengths, and the initial behavior of an aquifer in an elastic manner when perturbed (Weight and Wittman, 1999). Bredehoeft and others (1966) showed that oscillatory responses to slug tests are primarily controlled by the inertia of the water column in the well.…”

Section: Van Der Kamp Methodsmentioning

confidence: 99%

“…An estimate of storativity for the sand lithology (table 1) adjacent to the screened intervals of these piezometers is 10"4 (Weight and Wittman, 1999;Douglas McAda, U.S. Geological Survey, oral commun., 1999). Storativity appears as a product inside the logarithmic term of one of the coefficient terms so that even a large error in magnitude will have a small effect on a hydraulicconductivity estimate (Butler, 1997, p. 158-159).…”

Section: Van Der Kamp Methodsmentioning

confidence: 99%

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Use of air-pressurized slug tests to estimate hydraulic conductivity at selected piezometers completed in the Santa Fe Group aquifer system, Albuquerque area, New Mexico

Thorn¹

2000

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Section: Van Der Kamp Methodsmentioning

confidence: 99%

Section: Van Der Kamp Methodsmentioning

confidence: 99%

Use of air-pressurized slug tests to estimate hydraulic conductivity at selected piezometers completed in the Santa Fe Group aquifer system, Albuquerque area, New Mexico

Thorn¹

2000

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“…For the case in which overdamped slug test response data are collected from a partially penetrating well in an unconfined aquifer (e.g., riverbed conditions), the Bouwer and Rice method is a reasonable data analysis technique (Bouwer and Rice 1976;Bouwer 1989;Butler 1998;Weight and Wittman 1999). The method involves plotting the natural logarithm of the head response against time.…”

Section: Discussionmentioning

confidence: 99%

Spawning Habitat Studies of Hanford Reach Fall Chinook Salmon (Oncorhynchus tshawytscha), Final Report.

Geist¹,

Arntzen²,

Chien

2009

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SummaryThe Pacific Northwest National Laboratory conducted this study for the Bonneville Power Administration (BPA) with funding provided through the Northwest Power and Conservation Council (a) and the BPA Fish and Wildlife Program. The study was conducted in the Hanford Reach of the Columbia River. The goal of study was to determine the physical habitat factors necessary to define the redd capacity of fall Chinook salmon that spawn in large mainstem rivers like the Hanford Reach and Snake River. The study was originally commissioned in FY 1994 and then recommissioned in FY 2000 through the Fish and Wildlife Program rolling review of the Columbia River Basin projects. The work described in this report covers the period from 1994 through 2004; however, the majority of the information comes from the last four years of the study (2000 through 2004). Results from the work conducted from 1994 to 2000 were covered in an earlier report.More than any other stock of Pacific salmon, fall Chinook salmon (Oncorhynchus tshawytscha) have suffered severe impacts from the hydroelectric development in the Columbia River Basin. Fall Chinook salmon rely heavily on mainstem habitats for all phases of their life cycle, and mainstem hydroelectric dams have inundated or blocked areas that were historically used for spawning and rearing. The natural flow pattern that existed in the historic period has been altered by the dams, which in turn have affected the physical and biological template upon which fall Chinook salmon depend upon for successful reproduction. Operation of the dams to produce power to meet short-term needs in electricity (termed power peaking) produces unnatural fluctuations in flow over a 24-hour cycle. These flow fluctuations alter the physical habitat and disrupt the cues that salmon use to select spawning sites, as well as strand fish in near-shore habitat that becomes dewatered. The quality of spawning gravels has been affected by dam construction, flood protection, and agricultural and industrial development. In some cases, the riverbed is armored such that it is more difficult for spawners to move, while in other cases the intrusion of fine sediment into spawning gravels has reduced water flow to sensitive eggs and young fry.Recovery of fall Chinook salmon populations may involve habitat restoration through such actions as dam removal and reservoir drawdown. In addition, habitat protection will be accomplished through setasides of existing high-quality habitat. A key component to evaluating these actions is quantifying the salmon spawning habitat potential of a given river reach so that realistic recovery goals for salmon abundance can be developed. Quantifying salmon spawning habitat potential requires an understanding of the spawning behavior of Chinook salmon, as well as an understanding of the physical habitat where these fish spawn. Increasingly, fish biologists are recognizing that assessing the physical habitat of riverine systems where salmon spawn goes beyond measuring microhabitat like water depth, ...

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“…Based on preliminary results and on past research in similar sedimentary environments, intragravel flow was assumed to be laminar (Reynolds numbers less than unity; Vaux 1968). The fundamental hydraulic response of hyporheic flow to the slug tests was overdamped (i.e., approximating an exponential decay response), and was therefore analyzed using the Bouwer and Rice method (Bouwer and Rice 1976;Bouwer 1989;Butler 1998;Weight and Wittman 1999).…”

Section: Hyporheic Characteristicsmentioning

confidence: 99%

Grays River Watershed and Biological Assessment, 2006 Final Report.

May¹,

Geist

2007

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SummaryThe Grays River Watershed and Biological Assessment was funded to address degradation and loss of spawning habitat for chum salmon (Onchorhynchus keta) and fall Chinook salmon (Onchoryhnchus tshawytscha). In 1999, the National Marine Fisheries Service listed lower Columbia River chum salmon as a threatened Evolutionarily Significant Unit (ESU) under the Endangered Species Act of 1973 (ESA). The Grays River watershed is one of two remaining significant chum salmon spawning locations in this ESU. Runs of Grays River chum and Chinook salmon have declined significantly during the past century, largely because of damage to spawning habitat associated with timber harvest and agriculture in the watershed. In addition, approximately 20-25% of the then-remaining chum salmon spawning habitat was lost during a 1999 channel avulsion that destroyed an important artificial spawning channel operated by the Washington Department of Fish and Wildlife (WDFW). Although the lack of stable, high-quality spawning habitat is considered the primary physical limitation on Grays River chum salmon production today, few data are available to guide watershed management and channel restoration activities. The objectives of the Grays River Watershed and Biological Assessment project were to 1) perform a comprehensive watershed and biological analysis, including hydrologic, geomorphic, and ecological assessments; 2) develop a prioritized list of actions that protect and restore critical chum and Chinook salmon spawning habitat in the Grays River based on comprehensive geomorphic, hydrologic, and stream channel assessments; and 3) gain a better understanding of chum and Chinook salmon habitat requirements and survival within the lower Columbia River and the Grays River.The watershed-based approach to river ecosystem restoration relies on a conceptual framework that describes general relationships between natural landscape characteristics, watershed-scale habitat-forming processes, aquatic habitat conditions, and biological integrity. In addition, human land-use impacts are factored into the conceptual model because they can alter habitat quality and can disrupt natural habitatforming processes. In this model (Figure S.1), aquatic habitat-both instream and riparian-is viewed as the link between watershed conditions and biologic responses. Based on this conceptual model, assessment of habitat loss and the resultant declines in salmonid populations can be conducted by relating current and historical (e.g., natural) habitat conditions to salmonid utilization, diversity, and abundance. In addition, assessing disrupted ecosystem functions and processes within the watershed can aid in identifying the causes of habitat change and the associated decline in biological integrity. In this same way, restoration, enhancement, and conservation projects can be identified and prioritized.A watershed assessment is primarily a landscape-scale evaluation of current watershed conditions and the associated hydrogeomorphic riverine processes. The watershed ass...

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Oscillatory Slug‐Test Data Sets: A Comparison of Two Methods

Cited by 12 publications

References 12 publications

Use of air-pressurized slug tests to estimate hydraulic conductivity at selected piezometers completed in the Santa Fe Group aquifer system, Albuquerque area, New Mexico

Use of air-pressurized slug tests to estimate hydraulic conductivity at selected piezometers completed in the Santa Fe Group aquifer system, Albuquerque area, New Mexico

Spawning Habitat Studies of Hanford Reach Fall Chinook Salmon (Oncorhynchus tshawytscha), Final Report.

Grays River Watershed and Biological Assessment, 2006 Final Report.

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