Effects of Flow Augmentation on Snake River Fall Chinook

نویسندگان

  • J. J. Anderson
  • R. A. Hinrichsen
چکیده

Table 6. Flow survival regression S = a + b * Flow for seasonal data average by unweighted and weighted by smolt passage index. ∆S = (S 80-S 70)/ S 80 is a relative increase in survival with a 10 kcfs increase in flow where S 80 and S 70 are survivals at 80 and 70 kcfs Lower Table 15a. Scenario average flows (kcfs) and temperatures (centigrade) plus flow augmentation (maf) between day 160 and 220. Table 15b. Difference between Scenarios 2-7 and Scenario 1 for average flows (kcfs), temperatures (centigrade), and flow augmentation (maf) between day 160 and 220.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

An analysis of smolt survival with implications to flow management

Smolt survival through the Columbia/Snake river hydrosystem and tributaries of the Snake River are evaluated with the XT-model, which describes predator-prey interactions in terms of migration distance and time, temperature, turbidity, and a random encounter velocity between predators and prey. In this formulation, smolt survival depends on both distance traveled and exposure time, and the impo...

متن کامل

Effect of spill on adult salmon passage delay at Columbia River and Snake River dams

Spill, used to assist the downstream passage of juvenile Chinook salmon (Oncorhynchus tshawytscha), and steelhead (O. mykiss) at eight dams in the Columbia/Snake River hydrosystem may delay the upstream passage of the adults. To evaluate the potential effects of spill on adult passage we evaluated the historical relationship between the day-to-day variations of spill and upstream fish passage a...

متن کامل

Genetic Variation and Structure of Chinook Salmon Life History Types in the Snake River

—We evaluated 25 inland populations of Chinook salmon Oncorhynchus tshawytscha in the Snake River with 13 microsatellite loci to test for contemporary genetic differentiation at three scales: between life history types, among regions within life history types, and among populations within regions. The genetic distance and diversity of natural Chinook salmon populations were also contrasted with...

متن کامل

The Flow Survival Relationship and Flow Augmentation Policy in the Columbia River Basin

Flow augmentation and flow targets have been central programs in Columbia River salmon management for more than twenty years. Over this time, water requests have 1995a; NMFS 2000a). Over the same period, the body of science on the effects of flow grew from a single graph between smolt survival and Snake River flow, to a body of information involving the tagging of a million smolts with survival...

متن کامل

Decadal climate cycles and declining Columbia River salmon

Abstract This paper explores the effects of the interaction of anthropogenic trends and climate cycles on salmon declines in the Columbia and Snake river basins. A basic population model, including anthropogenic and environmental factors, is discussed and literature relating decadal scale climate patterns and the response of the North Pacific ecosystem is reviewed. From this background a ratche...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2000