15,109 research outputs found

    Analyzing the discharge regime of a large tropical river through remote sensing, ground-based climatic data, and modeling

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    This study demonstrates the potential for applying passive microwave satellite sensor data to infer the discharge dynamics of large river systems using the main stem Amazon as a test case. The methodology combines (1) interpolated ground-based meteorological station data, (2) horizontally and vertically polarized temperature differences (HVPTD) from the 37-GHz scanning multichannel microwave radiometer (SMMR) aboard the Nimbus 7 satellite, and (3) a calibrated water balance/water transport model (WBM/WTM). Monthly HVPTD values at 0.25° (latitude by longitude) resolution were resampled spatially and temporally to produce an enhanced HVPTD time series at 0.5° resolution for the period May 1979 through February 1985. Enhanced HVPTD values were regressed against monthly discharge derived from the WBM/WTM for each of 40 grid cells along the main stem over a calibration period from May 1979 to February 1983 to provide a spatially contiguous estimate of time-varying discharge. HVPTD-estimated flows generated for a validation period from March 1983 to February 1985 were found to be in good agreement with both observed arid modeled discharges over a 1400-km section of the main stem Amazon. This span of river is bounded downstream by a region of tidal influence and upstream by low sensor response associated with dense forest canopy. Both the WBM/WTM and HVPTD-derived flow rates reflect the significant impact of the 1982–1983 El Niño-;Southern Oscillation (ENSO) event on water balances within the drainage basin

    ELP Grad Takes Reins of FEMA Region III

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    Center for Homeland Defense and Security, PRESS RELEASESMaryAnn Tierney won’t have to travel far for her latest career move. Tierney was named Regional Administrator for the Federal Emergency Management Agency’s Region III this month and will begin..

    Grossman to Lead Security for Westfield

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    Center for Homeland Defense and Security, PRESS RELEASESMichael Grossman’s most recent position at the Los Angeles County Sheriff’s Department required bringing the private sector into the homeland security enterprise. He now has the opportunity to view the..

    Alumnus leads state-federal cyber-crime fight in Utah

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    Center for Homeland Defense and Security News and Stories, PRESS RELEASESBack in 2012, Keith Squires of the Utah Department of Public Safety received some troubling news from the state’s technology director. More and more cyber attacks were hitting Utah and..

    Jensen's Community Policing Efforts Build Partnerships with Muslim Community

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    Center for Homeland Defense and Security, PRESS RELEASESWhile Dennis Jensen was a student at the Center for Homeland Defense and Security he crafted a thesis on how community policing could fight crime among a growing Somali population..

    Times Square Case Highlights FDNY's Counterterrorism Mission

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    Center for Homeland Defense and Security, PRESS RELEASESSomething did not look right. When the New York City Fire Department (FDNY) responded to a reported car fire in Times Square May 1, 2010, firefighters noticed some things seemed..

    Choosing IED detection method calls for objectivity

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    Center for Homeland Defense and Security, OUT OF THE CLASSROOMDownload the paper: Paper: Explosive Detection Technologies for Commercial Ferries” U.S. Coast Guard Cmdr. Rob McLellan wrote his course paper in Technology on Homeland Security on the array of technologies..
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