Physical habitat classification and instream flow modeling to determine habitat availability during low-flow periods, North Fork Shenandoah River, Virginia

2006 ◽  
Author(s):  
Jennifer L. Krstolic ◽  
Donald C. Hayes ◽  
Peter M. Ruhl
Keyword(s):  
Low Flow ◽  
Habitat Availability ◽  
Physical Habitat ◽  
Flow Modeling ◽  
Instream Flow ◽  
Habitat Classification ◽  
North Fork

Low Flow and Instream Flow Requirements

2017 ◽  
pp. 353-374
Author(s):  
Salvatore Alecci ◽  
Giuseppe Rossi
Keyword(s):  
Low Flow ◽  
Instream Flow

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Author(s):  
Keyword(s):  
Water Quality ◽  
Waste Treatment ◽  
Fish Assemblages ◽  
Large River ◽  
Low Flow ◽  
Physical Habitat ◽  
Willamette River ◽  
Habitat Alterations ◽  
The Past ◽  
Species Occurrences

<em>Abstract.</em>—The Willamette River is Oregon’s largest river, with a basin area of 29,800 km<sup>2</sup> and a mean annual discharge of 680 m<sup>3</sup>/s. Beginning in the 1890s, the channel was greatly simplified for navigation. By the 1940s, it was polluted by organic wastes, which resulted in low dissolved oxygen concentrations and floating and benthic sludge deposits that hindered salmon migration and boating. Following basin-wide secondary waste treatment and low-flow augmentation, water quality markedly improved, salmon runs returned, and recreational uses increased. However, water pollution remains a problem as do physical habitat alterations, flow modification, and alien species. Fish assemblages in the main-stem Willamette River were sampled systematically, but with different gear, in the summers of 1945, 1983, and 1999. In the past 53 years, tolerant species occurrences decreased and intolerant species occurrences increased. In the past 20 years, alien fishes have expanded their ranges in the river, and four native fish species have been listed as threatened or endangered. We associate these changes with improved water quality between 1945 and 1983, fish migrations, altered flow regimes and physical habitat structure, and more extensive sampling.

Relationship between chinook salmon (Oncorhynchus tshawytscha) redd densities and PHABSIM-predicted habitat in the Merced and Lower American rivers, California

1999 ◽  
Vol 56 (4) ◽  
pp. 570-577 ◽  
Author(s):  
Sean P Gallagher ◽  
Mark F Gard
Keyword(s):  
Fisheries Management ◽  
Chinook Salmon ◽  
Significant Relationship ◽  
Oncorhynchus Tshawytscha ◽  
Simulation System ◽  
Physical Habitat ◽  
Instream Flow ◽  
Spawning Habitat ◽  
Habitat Simulation

An index of chinook salmon (Oncorhynchus tshawytscha) spawning habitat predicted using the physical habitat simulation system (PHABSIM) component of the instream flow incremental methodology was compared with redd densities and locations for sites in the Merced River, California, during 1996 and with redd numbers in sites in the Merced and Lower American rivers, California, from 1989 through 1996. Predicted weighted useable area (WUA) was significantly correlated with chinook salmon spawning density and location at five of seven sites in the Merced River. At the microhabitat level, in the Merced River during 1996, there was a significant relationship between chinook salmon redd location and predicted WUA. Cells with more WUA in the Merced River tended to have more redds. At the mesohabitat level, there was a significant relationship between redd density and predicted WUA in both rivers. Transect areas in the Merced River with higher predicted WUA had more redds. Sites with higher numbers of redds had more predicted WUA. Significant correlations between predicted WUA and spawning locations increase confidence in the use of PHABSIM modeling results for fisheries management in the Merced and Lower American rivers as well as in other rivers.

Bioenergetic Habitat Suitability Curves for Instream Flow Modeling: Introducing User‐Friendly Software and its Potential Applications

Fisheries ◽  
2020 ◽  
Vol 45 (11) ◽  
pp. 605-613
Author(s):  
Sean M. Naman ◽  
Jordan S. Rosenfeld ◽  
Jason R. Neuswanger ◽  
Eva C. Enders ◽  
John W. Hayes ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Flow Modeling ◽  
Instream Flow ◽  
Potential Applications ◽  
User Friendly

Comparison and regionalization of hydrologically based instream flow techniques in Atlantic Canada

1995 ◽  
Vol 22 (2) ◽  
pp. 235-246 ◽  
Author(s):  
Daniel Caissie ◽  
Nassir El-Jabi
Keyword(s):  
Regression Analysis ◽  
Base Flow ◽  
Low Flow ◽  
Coefficient Of Determination ◽  
Atlantic Canada ◽  
Ungauged Basins ◽  
Instream Flow ◽  
Regional Study ◽  
Explanatory Variables ◽  
Tennant Method

Five hydrologically based instream flow assessment methods are compared for 70 rivers in Atlantic Canada; these methods included (i) Tennant method; (ii) 25% mean annual flow (25% MAF); (iii) median monthly flow (Q50) which includes the aquatic base flow (ABF); (iv) the flow equalled or exceeded 90% of time on a monthly flow duration curve (Q90); and (v) the statistical 7-day low flow frequency of a 10-year recurrence interval (7Q10). By comparing the different methods relative to the 25% MAF (the commonly used method in Atlantic Canada), we found that the Q90 and 7Q10 methods predicted extremely low instream flows during winter and summer months. Resource management decisions based on these extremely low flow predictions could have serious adverse consequences. The median monthly flow method (Q50) was recommended for gauged basins, whereas the Tennant method, the 25% MAF method, and the ABF methods were recommended for ungauged basins. For ungauged basins, we conducted a regional study to estimate the 25% MAF and the ABF using multiple regression analysis. Physiographic parameters were used as explanatory variables in the regression analysis. Based on the coefficient of determination, R2, the best regression results were obtained for the 25% MAF with R2 ranging from 0.957 to 0.999. Although the results for ABF were slightly lower than for the 25% MAF, R2 was still in the range of 0.868 to 0.979. Key words: environmental assessment, maintenance flow, low flow, aquatic resources.

scholarly journals Environmental flow assessment in the context of climate change: a case study in Southern Quebec (Canada)

2021 ◽  
Author(s):  
Laureline Berthot ◽  
André St-Hilaire ◽  
Daniel Caissie ◽  
Nassir El-Jabi ◽  
Judith Kirby ◽  
...  
Keyword(s):  
Climate Change ◽  
Environmental Flows ◽  
Environmental Flow ◽  
Low Flow ◽  
Physical Habitat ◽  
Climate Change Scenarios ◽  
Management Tools ◽  
Water Abstraction ◽  
The Impact

Abstract Through a case study in Southern Quebec (Canada), the assessment of environmental flows in light of the effects of climate change is investigated. Currently, the 7Q2 flow metric (7-day average flow with a 2-year return period) is used for water abstraction management. Several flow metrics were calculated using flow time series simulated by a deterministic hydrological model (HYDROTEL) and climate change scenarios as inputs. Results were compared within homogeneous low flow regions defined using ascendant hierarchical clustering, for the 1990, 2020 and 2050 horizons and annual, summer and winter periods. The impact of each flow metric on the potential availability of physical habitat was analyzed using the wetted perimeter as a proxy. Results indicated that: (1) the increasing non-stationarity of simulated flow data sets over time will complicate the use of frequency analysis to calculate the 7Q2 flow metric; (2) summer low flow values are expected to be lower than winter low flows; and (3) flow-duration curve metrics like the LQ50 (median discharge value of the month with the lowest flow) may become relevant environmental flow metrics by 2050. Results question current water abstraction management tools and permit to anticipate future local and regional issues during low flow periods.

Low Flow Modeling in Small Steep Watersheds

1976 ◽  
Vol 102 (9) ◽  
pp. 1225-1239
Author(s):  
David S. Bowles ◽  
J. Paul Riley
Keyword(s):  
Low Flow ◽  
Flow Modeling

Effect of ice formation on selection of habitats and winter distribution of post-young-of-the-year Atlantic salmon parr

1999 ◽  
Vol 56 (1) ◽  
pp. 87-96 ◽  
Author(s):  
Kevin G Whalen ◽  
Donna L Parrish ◽  
Martha E Mather
Keyword(s):  
Atlantic Salmon ◽  
Habitat Use ◽  
Ice Formation ◽  
Habitat Availability ◽  
Physical Habitat ◽  
Winter Distribution ◽  
High Flows ◽  
Young Of The Year ◽  
Ice Period ◽  
Selection Of

We determined how ice affects selection of habitats and distribution of post-young-of-the-year Atlantic salmon (Salmo salar) parr during winter. Night snorkeling surveys were completed between November and April to evaluate parr habitat use and movements. Systematic measurements of water depth and velocity were recorded during ice-free and [Formula: see text]55% iced conditions to quantify habitat availability. Ice formation altered the distribution and reduced the abundance of habitats commonly used by parr; differences between parr habitat use and habitat availability were greatest when ice was present. Edge ice formation resulted in the concentration of flows, and areas of high flow were formed in midchannel; few parr were observed in midchannel after ice had formed. Through the winter, most parr were found lateral to high flows on the ice edge boundary or in the post-ice period lateral to the stream midchannel. The correspondence of parr movements during winter to changes in the physical habitat associated with ice formation indicates that movements and redistributions may be important for survival in streams affected by ice.

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