Rasgos biológicos de Salix humboldtiana willd: y régimen de pulsos de inundación / Biological traits of salix humboldtiana willd: and flood pulse

El pulso de inundación es el principal regulador en el establecimiento de los bosques de sauce criollo (Salix humboldtiana Willd) del río Paraná inferior. El control se expresa principalmente a través de dos procesos: a)la aparición de bancos colonizables por esta especie que, por sedimentación pueden llegar a transformaciones en albardones y b)la erosión fluvial, que elimina progresivamente los bosques ya establecidos. Varios rasgos de la biología del sauce, como producción de gran cantidad de semillas que germinan en ambientes muy húmedos y alejados de los árboles de la generación anterior, alta velocidad de crecimiento, adaptaciones a la inundación, han permitido su supervivencia en este ambiente tan dinámico

Koyukuk River flood recovery and mitigation : Relocation and floodproofing achieved by flood depth analysis, erosion analysis, and site suitability analysis

Two vigorous weather systems during the second half of August 1994 brought in deep levels of moisture out of the Bering Sea to northwest Alaska. With each system, strong northwesterly flow caused heavy precipitation, first as the warm moist air was brought in over the existing cold air, and again in advance of the passage of the cold front. Rain was heaviest on west- and southwest-facing slopes, enhanced by the terrain upslope. Due to the southwest-northeast orientation of the Koyukuk River basin, it was hit especially hard by these rains

The use of satellite radar for monitoring fluvial and coastal flooding

past, satellite observations of floods have been hampered by the presence of clouds and high resolution satelite data have not been available in near real - time. Initial tests in the UK have shown the ERS - 1 SAR to be a suitable sensor for flood mapping and fast delivery products can be obtained within hours of satellite acquisition. Suitable data acquisition, processing and dissemination methodologies are required tofacilitate worldwidw practical applications. An EC - European Space Agency funded pilot project for flood hazard assessment and mapping using ERS - 1 in the Philippines has recently begun. (AU)

Shear - wave velocities and soil period of unconsolidated sediments (soils) that underlie Evansville, Indiana

The unconsolidated sedimets (soils) underlying evanville, Indiana, are an important element contributing to the cities seismic risk. Knowledge of the shear - wave velocity of the unconsolidated sediment column is essential in predicting soil period, amplification potential, liquefaction risk, and other site responses to seismic shaking (AU)

Rainfall and floods hydrologic studies

Engineering geologists and other professionals concerned with the study and prevention of landslides and other mass movements need to have a clear idea of the basic concepts of geomorphology and landform evolution. Fluvial geomorphology is an important subtopic of this scientific field. Rainfall and floods play an important role in the evolution of fluvial forms. Therefore they are important agents of the geomorphology evolution. (AU)

Erosion and sedimentation processes and evaluation

The erosion and sedimentation processes as presented as natural phenomena linked with hydrologic and soil processes. The fundamental factors for erosion characterization are defined and its quantification is refered to. Sedimentation processes, including the sediment transport phenomena, are classified in order to understand the influence of these processes in mass movements. The evaluation of erosion and sedimentation processes is made, as well as an analysis of errors. Some examples and case studies are included for illustration. (AU)