« Back
Effects on Listed Fishes from the 2015 West False River Emergency Drought Barrier Project
Effects on Listed Fishes from the 2015 West False River Emergency Drought Barrier Project
Submitted on 15 Nov 2016

Marin Greenwood
This poster was presented at 9th Biennial Bay-Delta Science Conference, Sacramento, CA
Poster Views: 390
View poster »
Poster Abstract
The need to limit salinity intrusion into the Sacramento-San Joaquin River Delta led California’s Department of Water Resources to install the West False River (WFR) Emergency Drought Barrier (EDB) from spring to fall, 2015. Fish monitoring data indicate that migrating juvenile Winter-Run Chinook Salmon had left the Delta prior to EDB construction, whereas small proportions of Spring-Run Chinook (<20%) and Steelhead (<10%) were in the Delta (juvenile Green Sturgeon are potentially present year-round). Assessment of the proportion of Delta Smelt near the EDB is challenging because of the species’ current low abundance, with the greatest density apparently in the north Delta and a small proportion likely to have been blocked from exiting the south Delta by the EDB. Vibratory pile driving for abutment sheet/king piles limited noise effects. Sediment disturbance during rock placement increased turbidity, but only near the EDB; following barrier closure, turbidity greatly increased in nearby channels in which velocity increased, whereas low flow decreased turbidity in WFR. These differences in turbidity could have affected Delta Smelt habitat suitability. SCHISM hydrodynamic modeling suggested very high flows occurred through the notch in the middle of the EDB before full closure and formed a number of eddies in WFR which could have increased short-term predation susceptibility. High-resolution measurements indicate that over 95% of tidal flow in WFR was blocked by the EDB which, although creating an impingement risk on EDB barrier rocks for larval/juvenile Delta Smelt already in the channel, would have limited additional entrainment into WFR. Leaving the abutments in place for future EDB installations could have created additional low-velocity, eddy habitat (data from SCHISM modeling), but subsequent investigations found that the abutments are no longer necessary. The assessment of EDB effects provides valuable data to aid decisions made regarding future implementations of Delta barriers, should these be necessary.Report abuse »
Ask the author a question about this poster.
Ask a Question »

Creative Commons

Related Posters

Mohammad Alhafiz Bin Sadali, Nurul Amziah Md Yunus, Nasri Sulaiman, Noor Ain Kamsani and Izhal Abdul Halin

Roadmap for Realization of Sustainable Development Goals in the Indian Agricultural Context
Darshnaben Mahida 1* , Sendhil R 2 and P Ramasundaram 3

Is parental investment equal? The influence of parental feeding upon coral planulae fitness under thermal stress
Jessica Bellworthy; Maoz Fine

Impurity Lifecycle Management: Visualising a Vast Array of NMR and Other Analytical Data
Steve Coombes1, John Nightingale1, Azalea Micottis1, Albert Van Wyk2, Peter Russel2, Dimitris Argyropoulos2, Stephane Albrecht2

Computer Assisted Structure Elucidation of Two Biflavonoids from the Leaves of Ochna Mauritiana
G.A. Dziwornu,1 N.R. Toorabally,2 M.G Bhowon,2 S. Jhaumeer-Laulloo,2 S. Sunassee,1,3 A. Moser,4 D. Argyropoulos5