scholarly journals Three-Dimensional Eutrophication Model of Lake Washington, Washington State

2004 ◽  
Author(s):  
Carl F. Cerco ◽  
Mark R. Noel ◽  
Sung-Chan Kim
Keyword(s):  
Three Dimensional ◽  
Washington State ◽  
Lake Washington

Post-Pollution: Characterizing Ecological Recovery in a Historically Nutrient Enriched Lake.

2018 ◽  
Author(s):  
Iain MacKenzie
Keyword(s):  
Washington State ◽  
Septic System ◽  
Algal Communities ◽  
System A ◽  
Chemical Measurements ◽  
Healthy State ◽  
Lake Bottom ◽  
Lake Washington ◽  
Lake Bottom Sediment ◽  
Reconstructive Techniques

An iconic story of recovery from nutrient pollution is the restoration of the heavily enriched Lake Washington in Seattle, Washington State. Originally an integral part of the municipal septic system, a diversion of wastewater in 1968 has allowed Lake Washington to return to what has been recently described as a natural and healthy state. Yet is it accurate to characterize a lake as “recovered” based purely on chemical measurements? Does a legacy of pollution linger on in the ecology of a lake system long after the lake has been given a clean bill of health?Using paleolimological reconstructive techniques it is possible to compare pre-pollution and post-pollution communities of algae by looking at microfossils stored chronologically in the lake-bottom sediment. Use of this technique has afforded a test of the assumption that once pollution stress in a lake is alleviated, the algal communities quickly return to the pre-pollution state. Work on Lake Washington indicates that this does not always hold true. Instead, it suggests that a legacy of pollution persists in the algae and ecological community of the lake long after the nutrient levels have returned to normal.

scholarly journals The Sensitivity of Orographic Precipitation to Flow Direction: An Idealized Modeling Approach

2017 ◽  
Vol 18 (6) ◽  
pp. 1673-1688 ◽  
Author(s):  
Lee Picard ◽  
Clifford Mass
Keyword(s):  
Pacific Northwest ◽  
Wind Direction ◽  
Flow Direction ◽  
Three Dimensional ◽  
Washington State ◽  
Directional Sensitivity ◽  
Orographic Precipitation ◽  
Major Question ◽  
Olympic Mountains ◽  
Physics Model

Abstract A major question regarding orographic precipitation is its sensitivity to flow direction, with some research suggesting substantial sensitivity. To examine this issue, this paper describes a full physics model with realistic three-dimensional terrain that is forced by a single input sounding. This system is used to investigate the sensitivity of orographic precipitation to wind direction over the Pacific Northwest for conditions approximating an atmospheric river. The model results show considerable modulation of regional precipitation as flow direction changes, with results for four Washington State river drainages agreeing well with previous observational studies. It is shown that precipitation amounts over such drainages can vary substantially with very small changes in the direction of the incoming flow. To explore the origin of directional sensitivity of precipitation over the Olympic Mountains of western Washington State, additional experiments were carried out using modified terrain fields with smoothed or idealized Olympic Mountains, or with nearby orography removed. These simulations suggest that the sensitivity of Olympic Mountain precipitation to wind direction is more strongly modulated by the presence of surrounding orography than by the specific geometry of the Olympic Mountains.

scholarly journals Three-Dimensional Groundwater Models of the 300 Area at the Hanford Site, Washington State

2008 ◽  
Author(s):  
Mark D. Williams ◽  
Mark L. Rockhold ◽  
Paul D. Thorne ◽  
Yousu Chen
Keyword(s):  
Three Dimensional ◽  
Washington State ◽  
Hanford Site

Archive of datasonic SIS-1000 chirp subbottom data collected during USGS cruise K-1-95-PS Lake Washington, State of Washington, 1995

2002 ◽  
Author(s):  
Christopher J. Lyon ◽  
Uri Brink ◽  
J.W. Nealon ◽  
William Danforth ◽  
Robert Kayen
Keyword(s):  
Washington State ◽  
Lake Washington
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