Category: Modeling

This is my intro to the category.

Salish Sea Model tracks pollution, currents and climate change

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This article is the latest in a series about computer models and their uses within the Puget Sound ecosystem. Today, we look at the Salish Sea Model, one of several models in the region helping to predict water circulation, water quality and food-web relationships. Read the full series: Where and how the water moves The waters of Puget Sound contain complex chemical mixtures arising from natural and human sources. The waters are blended and pushed around by currents and other physical forces, creating conditions that vary from place to place. […]

Prey and predators create varying life-or-death conditions for salmon, as shown with Atlantis model

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This article is the latest in a series about computer models and their uses within the Puget Sound ecosystem. As scientists uncover more and more information about a particular ecosystem, computer modelers are often eager to put that raw data to good use in complex models tuned to local conditions. One highly acclaimed model, called Atlantis, has been applied to more than 40 ecosystems around the world. In Puget Sound, Atlantis has been used to study the food web to determine whether salmon are more threatened by predators or by […]

Quantitative models, including Ecopath, take food web studies to a higher level of analysis

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As part of a project exploring the technical uncertainties surrounding Puget Sound water quality, we are reviewing how computer models are used to advance our understanding of natural systems. This blog post is part of a series focused on different models and their uses within the Puget Sound ecosystem. The project is jointly sponsored by King County and the Puget Sound Institute. In the early 1980s, NOAA scientist Jeffrey Polovina and fellow researchers at the National Marine Fisheries Service in Hawaii developed what they called the Ecopath model, designed to describe […]

Researchers use a qualitative network model to test ways to boost production at shellfish farms

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As part of a project exploring the technical uncertainties surrounding Puget Sound water quality, we are reviewing how computer models are used to advance our understanding of natural systems. This blog post is part of a series focused on different models and their uses within the Puget Sound ecosystem. The project is jointly sponsored by King County and the Puget Sound Institute. The skeletal beginnings of nearly all models is a conceptual understanding of the basic workings of the system being studied: Who are the important actors, and what are their […]

Before supercomputers, a structural model helped scientists predict currents in Puget Sound

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As part of a project exploring the technical uncertainties surrounding Puget Sound water quality, we are reviewing how computer models are used to advance our understanding of natural systems. This blog post is part of a series focused on different models and their uses within the Puget Sound ecosystem. The project is jointly sponsored by King County and the Puget Sound Institute. One of the first working models of Puget Sound was a scaled-down concrete reproduction of the regional topography, with actual water running through channels, around islands and into bays, […]

Findings and reports: February 2023

Image of San Juan Islands from the Salish Sea Model
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Salish Sea Model provides insights on circulation and residence times The amount of time water circulates and “resides” in Puget Sound is of intense interest to regulators and emergency response officials who want to understand how quickly wastewater is flushed out of Puget Sound and into the ocean. A paper in the journal Estuarine, Coastal and Shelf Science reports that contrary to expectation, flushing of deeper waters may take longer in wintertime in large fjord-like basins such as Hood Canal. A new, higher resolution version of the Salish Sea Model […]

The quest continues for a nutrient reduction plan

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The quest continues for a large-scale plan to reduce human sources of nitrogen and improve the health of Puget Sound. This article is part of the Puget Sound Institute’s effort to explore the technical uncertainties related to the science of Puget Sound water quality. The project, jointly funded by King County and PSI, includes online workshops and discussions, along with informational blogs and articles. By Christopher Dunagan Human sources of nitrogen in Puget Sound have been blamed for increasing the intensity of algae blooms, lowering oxygen to critical levels, and […]

A network of computer models is predicting the future of Puget Sound

Tacoma Narrows Bridge viewed from Gig Harbor side https://www.flickr.com/photos/tomcollinsphoto/47070840014/in/photostream/
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A new $4.8 million dollar project led by the Puget Sound Institute links together a series of computer models to explore future scenarios across the watershed. Some of Puget Sound’s biggest concerns hold the greatest uncertainties.  Will we have clean water? Can the ecosystem sustain species like endangered salmon? How can the region continue to grow and still maintain healthy habitats for wildlife and people? What, in other words, is the future of Puget Sound? No one can travel through time to answer these questions firsthand (science has its limits), […]

Six things that people should know about ecosystem modeling and virtual experiments

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The Puget Sound Institute is facilitating a series of online workshops and discussions to explore the technical uncertainties related to the science of Puget Sound water quality. As part of the project, we are publishing informational blogs and articles, including this look at how computer models are becoming increasingly important to our understanding of the natural world. The project is jointly sponsored by King County and the Puget Sound Institute. By Christopher Dunagan If you are planning a hike, picnic or other outdoor activity, it might be wise to take a look at the local […]

Upcoming workshops on tools to evaluate water quality and biological integrity 

An image of brackish water mixing in the Salish Sea as shown by the Salish Sea Model. Image courtesy of the Salish Sea Modeling Center.
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New event: More than 130 researchers, scientists, modelers, and other experts attended our first workshop in July on The Science of Puget Sound Water Quality. The discussion continues with two interrelated workshops focusing on scientific tools for evaluating marine conditions and species health. Join us:  September 29th from 8 – 10 AM PT for Tools to Evaluate Water Quality. Learn about tools and new analyses from monitoring and modeling that help us better understand water quality and potential eutrophication impacts. We will look in particular at increased access to spatial and temporal […]

PSI monthly roundup: July 2022

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VIEW THE FULLY FORMATTED NEWSLETTER in your browser Low-oxygen problems to be scrutinized in talks about research, modeling efforts   For decades, researchers have been advancing their understanding of what causes the harmful and sometimes deadly low-oxygen problems afflicting some areas of Puget Sound. A series of 10 workshops on the subject will begin Tuesday, July 26th, and continue into next year. The workshops, coordinated by the Puget Sound Institute, will build on previous discussions, such as the Washington Department of Ecology’s Nutrient Forum and a forthcoming Marine Water Quality Implementation Strategy that […]

Low-oxygen problems to be scrutinized in talks about research, modeling efforts

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By Christopher Dunagan For decades, researchers have been advancing their understanding of what causes the harmful and sometimes deadly low-oxygen problems afflicting some areas of Puget Sound. Computer models have been developed to replicate conditions and point the way to possible solutions. Experts generally agree that excess nitrogen flowing into Puget Sound contributes to the low-oxygen conditions. What is needed now, some argue, is a stronger regionwide consensus around solutions to the problem. That could mean coming to terms with research findings, understanding the strengths and weaknesses of the models, […]