The anatomy of natural disasters on online media: hurricanes and wildfires     

Olynk Widmar  Nicole  Rash  Kendra  Bir  Courtney  Bir  Benjamin  Jung  Jinho 《Natural Hazards》2022,110(2):961-998

Natural Hazards - Increasing prevalence and scale of natural disasters fuel the need for new approaches to evaluating, and eventually mitigating, their impact. This analysis quantifies and compares...  相似文献   

A modeling framework for the design of collector wells     

Moore R  Kelson V  Wittman J  Rash V 《Ground water》2012,50(3):355-366

We present results of a design study performed for the Saylorville Wellfield in Iowa, which is owned and operated by the Des Moines Water Works. The purpose of this study was to estimate wellfield capacity and provide a preliminary design for two radial collector wells to be constructed in the outwash aquifer along the Des Moines River near Saylorville, Iowa. After a field investigation to characterize the aquifer, regional two-dimensional and local three-dimensional, steady-state groundwater flow modeling was performed to locate and design the wells. This modeling was the foundation for design recommendations based on the relative performance of 12 collector well designs with varying lateral numbers, elevations, screen lengths, and orientations. For each site, alternate designs were evaluated based on model estimates of the capacity, the percent of surface water captured, and the production per unit length of screen. Many of our results are consistent with current design practices based on experience and intuition, but our methods allow for a quantitative approach for comparing alternate designs. Although the results are site-specific, the framework for evaluating the hydraulic design of the Saylorville radial collector wells is broadly applicable and could be used at other riverbank filtration sites. In addition, many of the conclusions from this design study may apply at other sites where construction of radial collector wells is being considered.  相似文献   

A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions   总被引：2，自引：0，他引：2  

G. Chisham  M. Lester  S. E. Milan  M. P. Freeman  W. A. Bristow  A. Grocott  K. A. McWilliams  J. M. Ruohoniemi  T. K. Yeoman  P. L. Dyson  R. A. Greenwald  T. Kikuchi  M. Pinnock  J. P. S. Rash  N. Sato  G. J. Sofko  J.-P. Villain  A. D. M. Walker 《Surveys in Geophysics》2007,28(1):33-109

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Auroral pulsations—Television image and VLF hiss correlation     

M.W.J. Scourfield  J.P.S. Rash  D.D. Duthie 《Planetary and Space Science》1984,32(7):809-817

The association between VLF hiss and auroral-light intensity has been studied for pulsating auroras by coordinated observations with a broad band VLF receiver and a low light level TV system viewing the N₂⁺ ING emissions. Power spectral analyses of the VLF hiss and auroral-light intensity fluctuations display a common peak at 1.3 ± 0.3 Hz. Cross-spectral analysis shows that the times of the peaks in the auroral-light intensity fluctuations differ from those of the VLF hiss by times ranging between zero and 0.2 s. This result is shown to be compatible with a cyclotron resonance interaction in the vicinity of the equatorial plane. The periodicity of the intensity fluctuations can be accounted for by assuming the process is driven by echoing VLF hiss, which may be single-phase or three-phase.  相似文献