Hi, I'm an error. x

Recent Activity

ABSTRACT:

Water quality modeling tools such as Qual2K (Q2K) will be key to understanding future nutrient fluxes as western U.S. rivers experience urban development and changes to migratory fish populations. The Q2K model does not include macrophytes, which may influence nutrient flux and are common in some western rivers such as the Henry’s Fork of the Snake river in east Idaho. My objective was to evaluate the effectiveness of Q2K in the Henry’s Fork. I struggled to model total phosphorus (TP) and soluble reactive phosphorus (SRP) flux in the Henry’s Fork. Q2K over-predicted for both. SRP was sensitive to phosphorylation rates in sediments, flow rate, and periphyton coverage; processes influenced by macrophyte growth. Future use of Q2K to model P load from wastewater and kokanee in the Henry’s Fork will require an accurate understanding of feedbacks between SRP and macrophytes. My study results will enhance efforts to link nutrient flux and ecosystem change in the Henry’s Fork and in stream ecosystems in general.

Show More
Feb 22, 2019 at 8:55 p.m.
Resource type: Composite Resource

ABSTRACT:

This model was created to represent aggradation along a 2km reach of the Ailiao River in Southern Taiwan. It was created using interpolated and synthetic data and can be updated by data collected during field work.

Show More
Feb 22, 2019 at 8:30 p.m.
Resource type: Composite Resource

ABSTRACT:

One of the greatest threats to Great Salt Lake wetlands is the invasion of Phragmites australis. Recent research has highlighted effective control strategies for Phragmites, however natural recolonization of native plants needed to support wetland functions has been limited. Seeding is a feasible restoration option, however seedling mortality is often high. Understanding the mechanisms that drive early seedling outcomes by quantifying regeneration traits can improve our ability to manipulate and predict restoration actions. Additionally, managers involved in wetland restoration need to know how many seeds to sow, which sites should be prioritized for restoration, and when they should seed. I developed a simulation model to explore changes in native and invasive seed germination across initial seeding density, restoration site, and seasonal timing scenarios. Additionally, I incorporated the influence of seed mass on native species germination into my model. This approach represents a starting point for developing an important management tool that can be used to identify targeted, cost-effective wetland restoration strategies following Phragmites treatment.

Show More
Feb 22, 2019 at 6:15 p.m.
Resource type: Composite Resource

ABSTRACT:

Globally changing temperature and precipitation patterns are causing rapid changes stream temperatures, which in turn drive changes in the life histories and distributions of aquatic biota. However, large-scale stream temperature datasets have not been developed, and observational data remains limited. In order to better understand how ongoing thermal regime changes impact aquatic species, managers and researchers need better methods of quantifying stream temperatures at large spatial scales. Here, a linear regression model is used to develop a relationship between air and stream temperature, then is used to predict stream temperatures across the state of Utah in the month of August. Model validity was assessed by examining goodness of fit to observation data using R², Nash-Sutcliffe Efficiency index, and root mean square error-observations standard deviation ratio (RSR). Impact of outliers were assessed by examining mean absolute error (MAE), root mean square error (RMSE), and residuals. The approach presented here contributes to the well-described linear air/stream temperature model by providing a study of its performance at large spatial scales.

Show More

ABSTRACT:

In this report, I used a multi-objective optimization modeling for analyzing the trade-offs between the benefits of the recently proposed dams in the Bear River watershed in northern Utah and their effects on aquatic habitat.

Show More

ABSTRACT:

This report details a model that uses a nonlinear penalty function in a linear reservoir optimization model to identify a monthly reservoir release strategy that maximizes end-of-water-year storage in Island Park Reservoir, while satisfying habitat and flow requirements for fish and anglers. Using historic hydrologic data, I explore how strategies for reservoir release, storage, and irrigation reduction change across varying hydrologic regimes (wet, average, dry) and environmental flow requirements (800, 1000, 1200 cfs).

Show More
    No resources have been shared with this group yet.
Type Title First Author Date Created Last Modified Subject Authors Permission Level Labels Favorite Last modified Sharing Status Date Created
Composite Resource Composite Resource
Public Resource Sharable Resource
MACROPHYTES AND NUTRIENTS IN A STREAM SYSTEM: EVALUATING THE QUAL2K MODEL IN THE HENRY’S FORK OF THE SNAKE RIVER JOHN MCLAREN 23 Feb, 2019 9:06 a.m. 23 Feb, 2019 9:21 a.m. 1550913704 1550912770 4081
Composite Resource Composite Resource
Public Resource Sharable Resource
Sediment Transport - Ailiao River Dominique Shore 22 Feb, 2019 8:31 p.m. 22 Feb, 2019 9:05 p.m. 1550869537 1550867490 4078
Composite Resource Composite Resource
Published Resource
Improving Native Species Recruitment in Seed-based Wetland Restoration Emily Martin 22 Feb, 2019 8:06 p.m. 22 Feb, 2019 8:37 p.m. 1550867848 1550866017 4077
Composite Resource Composite Resource
Published Resource
A Linear Approach to Modeling Stream Temperature in Utah Greg Goodrum 21 Feb, 2019 8:24 p.m. 22 Feb, 2019 6:16 p.m. 1550859377 1550780649 3299
Composite Resource Composite Resource
Public Resource Sharable Resource
MULTI-OBJECTIVE OPTIMIZATION ANALYSIS OF WATER STORAGE AND FISH HABITAT IN THE BEAR RIVER WATERSHED Ali Farshid 22 Feb, 2019 5:13 p.m. 22 Feb, 2019 5:22 p.m. 1550856161 1550855624 3307
Composite Resource Composite Resource
Public Resource Sharable Resource
Maximizing storage in Island Park Reservoir, Idaho under varying hydrologic regimes and environmental flow requirements Christina Morrisett 20 Feb, 2019 3:45 a.m. 20 Feb, 2019 5:15 p.m. 1550682949 1550634327 3572
Public Resource Public
Private Resource Private
Discoverable Resource Discoverable
Published Resource Published
Pending Publication Pending publication
Sharable Resource Shareable
Non Sharable Resource Not shareable

Collection Resource Icon  Collection
Composite Resource Icon  Composite
Generic Resource Icon  Generic
Geographic Feature Resource Icon  Geographic Feature
Geographic Raster Resource Icon  Geographic Raster
Model Instance Resource Icon  Model Instance
Collection Resource Icon  MODFLOW Model Instance
SWAT Model Instance Resource Icon  SWAT Model Instance
Model Program Resource Icon  Model Program
Multidimensional Resource Icon  Multidimensional
Time Series Resource Icon  Time Series
HIS Referenced Time Series Resource Icon  HIS Referenced Time Series
Web App Resource Icon  Web App
Script Resource Icon  Script