نتایج جستجو برای: floodplain mapping
تعداد نتایج: 202052 فیلتر نتایج به سال:
River-floodplain systems are characterized by changing hydrological connectivity and variability of resources delivered to floodplain water bodies. Although the importance of hydrological events has been recognized, the effect of flooding on CH4 concentrations and emissions from European, human-impacted river-floodplains is largely unknown. This study evaluates aquatic concentrations and emissi...
Real-Time Detection, Registration and Recognition Using Pixel-Level Fusion of Active/Passive Imagery
A system has been developed whereby active ladar and passive electro-optic imaging data are aligned in hardware at the pixel level. The resulting arrays of fully aligned, high-dimension feature data permit dense point matching in three spatial dimensions for enhanced real-time detection, registration and target recognition. Military applications for which this technology is being developed or a...
This research is related to the eco-hydrological problems of the herbaceous wetland drying and biodiversity loss in the floodplain lakes of the Middle Basin of the Biebrza River (Poland). An experiment was set up, with its main goals as follows: (i) mapping the vegetation types and the temporarily or permanently flooded areas, and (ii) comparing the usefulness of the C-band Sentinel-1A (S1A) an...
This research is related to the eco-hydrological problems of herbaceous wetland drying and biodiversity loss in the floodplain lakes of the Middle Basin of the Biebrza river (Poland). An experiment was set up, whose main goals were: (i) mapping the vegetation types and the temporarily or permanently flooded areas, and (ii) comparing the usefulness of C-band Sentinel-1A (S1A) and X-band TerraSAR...
Floodplains are among the world's most threatened ecosystems due to the pervasiveness of dams, levee systems, and other modifications to rivers. Few unaltered floodplains remain where we may examine their dynamics over decadal time scales. Our study provides a detailed examination of landscape change over a 60-year period (1945-2004) on the Nyack floodplain of the Middle Fork of the Flathead Ri...
Our recommendations for reducing the abundance of non-native invertebrates follow many of the guidelines described for non-native fishes. Few introduced species were found on the Cosumnes River Floodplain, although analogous floodplain habitats such as the Yolo Bypass further towards San Francisco Bay reinforce our recommendations. We found the red swamp crayfish Procambarus clarkii in signific...
Deployment of Sentinel-1 (S1) satellite constellation carrying a C-band synthetic aperture radar (SAR) enables regular and timely monitoring floods from their onset until returning to nonflooded (NF) conditions. The major constraint on using SAR for near-real-time (NRT) flood mapping has been the inability rapidly process obtained imagery into reliable maps. This study evaluates efficacy S1 tim...
An integrated framework was employed to develop probabilistic floodplain maps, taking into account hydrologic and hydraulic uncertainties under climate change impacts. To the several scenarios representing individual compounding effects of models’ input parameters uncertainty were defined. Hydrologic model calibration validation performed using a Dynamically Dimensioned Search algorithm. A gene...
Quantity and quality of sediment deposition in complex floodplains are affected by many processes that are typically highly spatially and temporally variable and hard to quantify exactly. The main processes in this context are suspended sediment transport dynamics in rivers, floodplain channel interactions, and internal floodplain processes. In consequence, any point measurement of sedimentatio...
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