Supervisory Hydrologist
Central Midwest Water Science Center
Email:
jmurphy@usgs.gov
Office Phone:
815-752-2040
Fax:
815-756-9214
ORCID:
0000-0002-0881-0919
Location
Aspen Ridge Business Park
650 Peace Road
DeKalb
, IL
60115
Supervisor:
Amy M Russell
|
This data set includes WRTDS nutrient flux trend results and the values of daily streamflow trend results displayed in the Quantile-Kendall plots. For 1995-2015 nutrient trends, the method of generalized flow normalization (FNG) was used which explicitly addresses non-stationary streamflow conditions. For 2005-2015 nutrient trends, the WRTDS trend analyses used the method of stationary flow normalization (FNS) because streamflow nonstationarity is difficult to assess over this shorter duration time frame. The 1995-2015 annual nutrient trends were determined for all five nutrient parameters (TP, SRP, TN, NO23, TKN), and monthly trends were evaluated only for SRP. The 2005-2015 annual nutrient trends were determined...
Categories: Data;
Tags: Great Lakes,
Indiana,
Lake Erie,
Michigan,
Ohio, All tags...
Weighted regression on time, discharge, and season (WRTDS),
Western Lake Erie,
environment,
geoscientificInformation,
nitrate,
nitrogen,
nutrient,
phosphorus,
streamflow,
trend,
water quality, Fewer tags
|
The datasets provided here are the input data used to run the Seasonal Kendall Trend (SKT) tests and Weighted Regressions on Time, Discharge, and Season (WRTDS) models. SKT tests use "annualSamplingFreqs_allSites.csv" and "wqData_screenedSitesAll.csv" which includes, for all site-parameter combinations, information on annual sampling frequencies and the screened water-quality data, respectively. The WRTDS models use "DRB.wqdata.20200521.csv", "DRB.flow.20200610.zip", and "DRB.info.20200521.csv" for calibration which includes, for all site-parameter combinations, the water-quality data, streamflow data (as separate .csv files for each site), model specifications and site information, respectively. The multisource...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Ammonia,
Calcium,
Chloride,
Delaware,
Delaware River, All tags...
Magnesium,
Major ions,
Maryland,
New Jersey,
New York,
Nitrate,
Orthophosphate, filtered,
Orthophosphate, unfiltered,
Pennsylvania,
Potassium,
Seasonal Kendall trend test (SKT),
Sodium,
Specific conductance,
Sulfate,
Suspended sediment concentration,
Total dissolved solids,
Total nitrogen,
Total phosphorus,
Total suspended solids,
Water Quality,
Water Quality Water Analysis,
Water-Quality Parameters,
Weighted regressions on time, discharge and season (WRTDS),
environment,
nutrient content (water),
salinity,
suspended material (water), Fewer tags
|
This data release contains one dataset and one model archive in support of the journal article, "Leveraging machine learning to automate regression model evaluations for large multi-site water-quality trend studies," by Jennifer C. Murphy and Jeffrey G. Chanat. The model archive contains scripts (run in R) to reproduce the four machine learning models (logistic regression, linear and quadratic discriminant analysis, and k-nearest neighbors) trained and tested as part of the journal article. The dataset contains the estimated probabilities for each of these models when applied to a training and test dataset.
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Delaware River Basin,
USGS Science Data Catalog (SDC),
United States of America,
Water Quality,
biota, All tags...
k-nearest neighbors,
linear discriminant analysis,
logistic regression,
quadratic discriminant analysis, Fewer tags
|
Data provided in this release support the findings in Choquette et al. (2019), utilizing methods for evaluating water-quality and daily-streamflow trends described also in Hirsch and DeCicco (2015 and 2018a) and Hirsch (2018). The trend results and model-input data focus on 10 locations in the Lake Erie watershed that have long-term (20 or more years) water-quality and streamflow monitoring records. The trend results include the years 1987 through 2016 or specified sub-periods during this time frame. The model-input data records spanned the time period 1974 through 2016 although record lengths varied by site, data type, and trend analysis. The water-quality records were provided by the National Center for Water...
Categories: Data;
Tags: Great Lakes,
Indiana,
Lake Erie,
Michigan,
Ohio, All tags...
USGS Science Data Catalog (SDC),
Water Quality,
Water Resources,
Weighted regression on time, discharge, and season (WRTDS),
Western Lake Erie,
geoscientificInformation,
nitrate,
nitrogen,
nutrient,
phosphorus,
streamflow,
trend,
water quality, Fewer tags
|
For about 10 years, the U.S. Geological Survey (USGS) has monitored water quality and streamflow in three agricultural drainage ditches in an effort to evaluate the influence of best management practices on water quality. These ditches are small tributaries to oxbow lakes located in the Mississippi Alluvial Plain of northwestern Mississippi--two sites (LWSR and LWT2) drain to Lake Washington and one site (BLT1) drains to Bee Lake. Streamflow was intermittent at these sites and the ditches were dry much of the year. When streamflow was present, flows were measured on 15-minute intervals and water-quality samples were collected over the course of the flow event using an automated sampler. These datasets were aggregated...
Categories: Data;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Lower Mississippi - Yazoo,
USGS Science Data Catalog (SDC),
Water Quality,
agriculture,
best management practices, All tags...
conservation practices,
nutrient content (water),
runoff,
sediment transport, Fewer tags
|
View more...
|
