A5075961408- Hydrology and Watershed Management Studies
- Hydrology and Drought Analysis
- Hydrological Forecasting Using AI
- Flood Risk Assessment and Management
- Water resources management and optimization
- Hydrology and Sediment Transport Processes
- Climate variability and models
- Groundwater flow and contamination studies
- Water Quality and Resources Studies
- Soil Geostatistics and Mapping
- Cryospheric studies and observations
- Water Systems and Optimization
- Geological Modeling and Analysis
- Water-Energy-Food Nexus Studies
- High voltage insulation and dielectric phenomena
- Archaeology and Natural History
- Geographic Information Systems Studies
- Geophysics and Gravity Measurements
- Fish Ecology and Management Studies
- Hydraulic flow and structures
- Reservoir Engineering and Simulation Methods
- Time Series Analysis and Forecasting
- Plant Water Relations and Carbon Dynamics
- Advanced Electrical Measurement Techniques
- Plant responses to elevated CO2
United States Geological Survey
2012-2022
Pacific Island Ecosystems Research Center
2021
Entertainment Industries Council
2020
John Wiley & Sons (United States)
2018
Potomac River Fisheries Commission
2004-2005
National Academies of Sciences, Engineering, and Medicine
2005
Massachusetts Institute of Technology
1999
First posted March 29, 2018 Revised May 31, 2019 For additional information, contact: Chief, Analysis and Prediction Branch Integrated Modeling Division Water Mission Area U.S. Geological Survey 12201 Sunrise Valley Drive Mail Stop 415 Reston, VA 20192 Accurate estimates of flood frequency magnitude are a key component any effective nationwide risk management damage abatement program. In addition to accuracy, methods for estimating must be uniformly consistently applied because the Nation’s...
Abstract In the past, hydrologic modeling of surface water resources has mainly focused on simulating cycle at local to regional catchment domains. There now exists a level maturity among catchment, global security, and land communities such that these are converging toward continental domain models. This commentary, written from hydrology community perspective, provides review progress in each this achievement, identifies common challenges face, details immediate specific areas which can...
Abstract Streamflow time series are commonly derived from stage‐discharge rating curves, but the uncertainty of curve and resulting streamflow poorly understood. While different methods to quantify in relationship exist, there is limited understanding how estimates differ between due assumptions methodological choices. We compared curves seven at three river locations varying hydraulic complexity. Comparison estimated uncertainties revealed a wide range estimates, particularly for high low...
Many challenges, including climate change, face the Nation's water managers. The Intergovernmental Panel on Climate Change (IPCC) has provided estimates of how may but more understanding processes driving changes, sequences and manifestation these global changes at different scales could be beneficial. Since will likely affect fundamental drivers hydrological cycle, change have a large impact resources purpose this interagency report prepared by U.S. Geological Survey (USGS), Army Corps...
Abstract Streamflow data are used for important environmental and economic decisions, such as specifying regulating minimum flows, managing water supplies, planning flood hazards. Despite significant uncertainty in most flow data, the series these applications often communicated without information. In this commentary, we argue that proper analysis of river can reduce costs promote robust conclusions management applications. We substantiate our argument by providing case studies from Norway...
Abstract Robust hydrologic models are needed to help manage water resources for healthy aquatic ecosystems and reliable supplies people, but there is a lack of comprehensive model comparison studies that quantify differences in streamflow predictions among applications developed answer management questions. We assessed daily by four fine‐scale two regional‐scale monthly time step comparing fit statistics bias ecologically relevant flow (ERFSs) at five sites the Southeastern USA. Models were...
Abstract. In the United States, estimation of flood frequency quantiles at ungauged locations has been largely based on regional regression techniques that relate measurable catchment descriptors to quantiles. More recently, spatial interpolation point data have shown be effective for predicting streamflow statistics (i.e., flows and low-flow indices) in catchments. Literature reports successful applications two techniques, canonical kriging, CK (or physiographical-space-based interpolation,...
The U.S. Geological Survey (USGS) conducted a gap analysis to evaluate how well the USGS streamgage network meets variety of needs, focusing on ability calculate various statistics at locations that have streamgages (gaged) and do not (ungaged). This report presents results determine where there are gaps in gaged locations, accurately desired can be calculated with given length record, whether current allows for estimation these ungaged locations. indicated is variability across Nation’s...
Methods for quantifying the uncertainty in discharge measurements typically identify various sources of and then estimate from each these by applying results empirical or laboratory studies. If actual measurement conditions are not consistent with those encountered studies, methods may give poor estimates uncertainty. This paper presents an alternative method estimating that uses statistical techniques on-site observations. interpolated variance estimator (IVE) based on data collected during...
Effective and responsible management of water resources relies on a thorough understanding the quantity quality available water. Streamgages cannot be installed at every location where streamflow information is needed. As part its National Water Census, U.S. Geological Survey planning to provide predictions for ungaged locations. In order predict useful spatial temporal resolution throughout Nation, efficient methods need selected. This report examines several used prediction in basins...
Abstract. In many simulations of historical daily streamflow distributional bias arising from the properties residuals has been noted. This often presents itself as an underestimation high and overestimation low streamflow. Here, 1168 streamgages across conterminous USA, having at least 14 complete water years data between 1 October 1980 30 September 2013, are used to explore a method for rescaling simulated correct bias. Based on existing approach that separates into components temporal...
Streamflow is not measured at every location in a stream network. Yet hydrologists, State and local agencies, the general public still seek to know streamflow characteristics, such as mean annual flow or flood flows with different exceedance probabilities, ungaged basins. The goals of this guide are introduce familiarize user weighted multiple-linear regression (WREG) program, also provide theoretical background for program features. intended be used develop regional estimation equation...
First posted August 25, 2020 For additional information, contact: Director, Dakota Water Science CenterU.S. Geological Survey821 East Interstate AvenueBismarck, ND 585031608 Mountain View RoadRapid City, SD 57702 Streamflow estimates for floods with an annual exceedance probability of 0.001 or lower are needed to accurately portray risks critical infrastructure, such as nuclear powerplants and large dams. However, extrapolating flood-frequency curves developed from at-site systematic...
The Omnibus Public Land Management Act of 2009 (Public Law 111-11) was passed into law on March 30, 2009. Subtitle F, also known as the SECURE Water Act, calls for establishment a "national water availability and use assessment program" within U.S. Geological Survey (USGS). A major driver this recommendation that national have not been comprehensively assessed since 1978. This report fulfills requirement to Congress progress in implementing program, referred National Census. authorized \$20...
According to the Federal guidelines for flood-frequency estimation, uncertainty of peak streamflow statistics, such as 1-percent annual exceedance probability (AEP) flow at a streamgage, can be reduced by combining at-site estimate with regional regression obtain weighted statistic. The procedure assumes estimates are independent, which is reasonable in most practical situations. purpose this publication describe and make available method calculating from or variance two independent estimates.
Abstract Flood‐frequency curves, critical for water infrastructure design, are typically developed based on a stationary climate assumption. However, changes expected to violate this Here, we propose new, climate‐informed methodology estimating flood‐frequency curves under non‐stationary future conditions. The develops an asynchronous, semiparametric local‐likelihood regression (ASLLR) model that relates moments of annual maximum flood variables using the generalized linear model. We...
First posted September 12, 2018 For additional information, contact: Coordinator—Water Availability and Use Science Program U.S. Geological Survey 12201 Sunrise Valley Drive Reston, VA 20192 The Omnibus Public Land Management Act of 2009 (Public Law 111—11) was passed into law on March 30, 2009. Subtitle F, also known as the SECURE Water Act, calls for establishment a “national water availability use assessment program” within (USGS). USGS issued first report program in 2013. progress over...
First posted August 29, 2019 Revised February 18, 2021 For additional information, contact: Director, Integrated Modeling and Prediction DivisionWater Mission AreaU.S. Geological SurveyMS 41512201 Sunrise Valley DriveReston, VA 20192 This report serves as a reference document in support of the regionalization surface-water statistics using multiple linear regression. Streamflow are quantitative characterizations hydrology often derived from observed streamflow records. In absence records, at...
Accurate estimators of streamflow statistics are critical to the design, planning, and management water resources. Given increasing evidence trends in low-streamflow, new approaches estimating low-streamflow needed. Here we investigate simple select a recent subset low-flow record update commonly used statistic 7Q10, annual minimum 7-day exceeded 9 out 10 years on average. Informed by records at 174 US Geological Survey streamgages, Monte Carlo simulation experiments evaluate competing...
Abstract Spatial and temporal patterns in low streamflows were investigated for 183 streamgages located the Chesapeake Bay Watershed period 1939–2013. Metrics that represent different aspects of frequency magnitude examined trends: (1) annual time series seven‐day average minimum streamflow, (2) scaled deficit at or below 2% mean daily streamflow value relative to a base between 1939 1970, (3) number days threshold. Trends these statistics showed spatial cohesion, with increasing volume...
Of all the potential threats posed by climatic variability and change, those associated with water resources are arguably most consequential for both society environment (Waggoner, 1990). Climatic effects on agriculture, aquatic ecosystems, energy, industry strongly influenced water. Thus, understanding changes in distribution, quantity quality of, demand response to climate change is essential planning adapting future conditions. A central role of U.S. Geological Survey (USGS) respect...
Abstract Low‐flow characteristics can be estimated by multiple linear regressions or the index‐streamgage approach. The latter transfers streamflow information from a hydrologically similar, continuously gaged basin (‘index streamgage’) to one with very limited record, but often results in biased estimates. application of approach generalized into three steps: (1) selection interest, (2) definition hydrologic similarity and index streamgage, (3) an information‐transfer Here, we explore...