Current Search:  Stream measurements (x)

View All Items

  • CSV Spreadsheet
(1 - 5 of 5)
Optimization and inductive models for continuous estimation of hydrologic variables
Title
Optimization and inductive models for continuous estimation of hydrologic variables.
Creator
Brown, Ricardo Eric., College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description
This thesis develops methodologies for continuous estimation of hydrological variables which infill missing daily rainfall data and the forecast of weekly streamflows from a watershed. Several mathematical programming formulations were developed and used to estimate missing historical rainfall data. Functional relationships were created between radar precipitation and known rain gauge data then are used to estimate the missing data. Streamflow predictions models require highly non-linear...
Show moreThis thesis develops methodologies for continuous estimation of hydrological variables which infill missing daily rainfall data and the forecast of weekly streamflows from a watershed. Several mathematical programming formulations were developed and used to estimate missing historical rainfall data. Functional relationships were created between radar precipitation and known rain gauge data then are used to estimate the missing data. Streamflow predictions models require highly non-linear mathematical models to capture the complex physical characteristics of a watershed. An artificial neural network model was developed for streamflow prediction. There are no set methods of creating a neural network and the selection of architecture and inputs to a neural network affects the performance. This thesis addresses this issue with automated input and network architecture selection through optimization. MATLABª scripts are developed and used to test many combinations and select a model through optimization.
Show less
Date Issued
2012
PURL
http://purl.flvc.org/FAU/3342036
Subject Headings
Hydorlogic models, Mathematics, Fuzzy logic, Spatial analysis (Statistics), Stream measurements
Format
Document (PDF)
Streamflow extremes and climate variability in Southeastern United States
Title
Streamflow extremes and climate variability in Southeastern United States.
Creator
Bobsein, Jenna, Teegavarapu, Ramesh, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description
Trends in streamflow extremes at a regional scale linked to the possible influences of four major oceanic-atmospheric oscillations are analyzed in this study. Oscillations considered include: El Niño Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO), and North Atlantic Oscillation (NAO). The main emphasis is low flows in the South-Atlantic Gulf region of the United States. Several standard drought indices of low flow extremes during two...
Show moreTrends in streamflow extremes at a regional scale linked to the possible influences of four major oceanic-atmospheric oscillations are analyzed in this study. Oscillations considered include: El Niño Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), Atlantic Multidecadal Oscillation (AMO), and North Atlantic Oscillation (NAO). The main emphasis is low flows in the South-Atlantic Gulf region of the United States. Several standard drought indices of low flow extremes during two different phases (warm/positive and cool/negative) of these oscillations are evaluated. Long-term streamflow data at 43 USGS sites in the region from the Hydro-Climatic Data Network that are least affected by anthropogenic influences are used for analysis. Results show that for ENSO, low flow indices were more likely to occur during La Niña phase; however, longer deficits were more likely during El Niño phase. Results also show that for PDO (AMO), all (most) low flow indices occur during the cool (warm) phase.
Show less
Date Issued
2015
PURL
http://purl.flvc.org/fau/fd/FA00004348, http://purl.flvc.org/fau/fd/FA00004348
Subject Headings
Atmospheric physics -- Statistical methods, Climate change mitigation, Climatic changes -- Measurement, Hydrology, Mathematical statistics, Maxima and minima, Stream measurement
Format
Document (PDF)
Tidal and long-term volume transport through Jewfish Creek, Florida Keys
Title
Tidal and long-term volume transport through Jewfish Creek, Florida Keys.
Creator
Pitts, Patrick A., Harbor Branch Oceanographic Institute
Date Issued
1998
PURL
http://purl.flvc.org/FCLA/DT/3171648
Subject Headings
Tides --Florida --Biscayne Bay, Hydrodynamics --Mathematical models, Stream measurements, Water --Analysis, Estuarine ecology
Format
Document (PDF)
Oceanic-Atmospheric Influences on Streamflow Extremes & Characteristics in Southeastern United States
Title
Oceanic-Atmospheric Influences on Streamflow Extremes & Characteristics in Southeastern United States.
Creator
Carpenter, Andrea, Teegavarapu, Ramesh, Florida Atlantic University, College of Engineering and Computer Science, Department of Civil, Environmental and Geomatics Engineering
Abstract/Description
Comprehensive evaluation of changes in streamflow extremes and characteristics due to climate change and variability is the main focus of this study. Available streamflow data at several gaging stations in least anthropologically affected watersheds of the Southeastern Gulf-Atlantic Region, were used for this analysis. To evaluate influences due to climate change, nonparametric trend tests were applied to annual and monthly extremes, while considering seasonality, along with changes in...
Show moreComprehensive evaluation of changes in streamflow extremes and characteristics due to climate change and variability is the main focus of this study. Available streamflow data at several gaging stations in least anthropologically affected watersheds of the Southeastern Gulf-Atlantic Region, were used for this analysis. To evaluate influences due to climate change, nonparametric trend tests were applied to annual and monthly extremes, while considering seasonality, along with changes in streamflow characteristics. To understand climate variability influences, streamflow data is partitioned in to cool and warm phases of four oceanic and atmospheric oscillations known to have an effect on hydroloclimatology of the region: El Niño-Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO); Atlantic Multi-decadal Oscillation (AMO); and North Atlantic Oscillation (NAO). Generally, results showed decreasing trends in overall streamflow extremes, as well as spatially varying, temporally non-uniform influences of climate variability on streamflow extremes and characteristics.
Show less
Date Issued
2016
PURL
http://purl.flvc.org/fau/fd/FA00004766, http://purl.flvc.org/fau/fd/FA00004766
Subject Headings
Atmospheric physics--Statistical models., Atmospheric thermodynamics., Fluid dynamics., Stream measurements.
Format
Document (PDF)
Temperature and Salinity Response Surface Analysis of a Subtropical Oyster Crassostrea virginica (Gmelin, 1791)
Title
Temperature and Salinity Response Surface Analysis of a Subtropical Oyster Crassostrea virginica (Gmelin, 1791).
Creator
DiGialleonardo, Julian J., Roesijadi, Guritno, Florida Atlantic University
Abstract/Description
Anthropogenic modifications to' the St. Lucie River watershed have significantly altered the patterns offreshwater flow, resulting in extreme changes of salinity and the subsequent decline in the health ofthe estuary. While much is already reported for the response of Crassostrea virginica to temperature and salinity, distinct differences exist along its distribution range warranting site specific assessments for previously unstudied populations. A modified Central Composite Inscribed...
Show moreAnthropogenic modifications to' the St. Lucie River watershed have significantly altered the patterns offreshwater flow, resulting in extreme changes of salinity and the subsequent decline in the health ofthe estuary. While much is already reported for the response of Crassostrea virginica to temperature and salinity, distinct differences exist along its distribution range warranting site specific assessments for previously unstudied populations. A modified Central Composite Inscribed response surface analysis was designed to describe the response of the local C. virginica population to a range of endemic salinity and temperature combinations. Controlled temperature and salinity studies were carried out at the Gumbo Limbo Marine Science Center in a mesocosm facility specifically designed and constructed for this project. Condition index and RNA:DNA ratio served as response measures. Minimum values for condition index were observed at combinations of high temperatures(> 25 °C) and low salinities (< 5 psu). The analysis of oyster RNA: DNA ratios showed a similar pattern of response, although, in this case, its relationship with temperature and salinity was not as strong. The final models for mean condition index and the RNA:DNA ratios explained 77.3% and 35.8% of the respective variances.
Show less
Date Issued
2007
PURL
http://purl.flvc.org/fau/fd/FA00000745
Subject Headings
Oyster culture--Florida--Saint Lucie River, Response surfaces (Statistics), Stream measurements--Florida, Marine ecology
Format
Document (PDF)