TDG mortality in the Snake and Columbia River using COMPASS
This is a lightweight interface to the COMPASS model for evaluating TDG exposure of juvenile salmonids. TDG is input from WQM observations, modeled in COMPASS, or input as a constant by the user.
The functional forms of the mortality rate and the fish-depth distribution are also controlled by the user. The effective TDG level that causes gas bubble trauma is a function of depth. Effective TDG declines at 2.96% per foot. Source: Fidler and Miller 1994
TDG modeling at each dam is a function of flow, spill fraction, tailrace mixing and entrainment of powerhouse-side water. Each dam has its own calibration. Source: Method for modeling TDG. In the reservoirs, TDG modeling is a mixing and dissipating process that is function of time. Source: CRiSP.1.6 Theory and Calibration.
Columbia Basin Research, School of Fishery and Aquatic Sciences, University of Washington, Seattle, WA 98195.