Search results for "Backscattering"

showing 2 items of 42 documents

Coupling two radar backscattering models to assess soil roughness and surface water content at farm scale

2013

Remote sensing techniques are useful for agro-hydrological monitoring at the farm scale because the availability of spatially and temporally distributed data improves agricultural models for irrigation and crop yield optimization under water scarcity conditions. This research focuses on the surface water content retrieval using active microwave data. Two semi-empirical models were chosen as these showed the best performances in simulating cross and co-polarized backscatter. Thus, these models were coupled to obtain reliable assessments of both soil water content and soil roughness. The use of the coupled model enables one to avoid using roughness measured in situ. Remote sensing images and …

backscattering soil water content surface roughness vegetation indicesBackscatterSettore ICAR/02 - Costruzioni Idrauliche E Marittime E Idrologiasoil water contentRadar backscatteringSurface finishlaw.inventionData setlawvegetation indicesSoil waterSettore AGR/08 - Idraulica Agraria E Sistemazioni Idraulico-ForestaliEnvironmental scienceRadarUnderwaterSettore ICAR/08 - Scienza Delle CostruzioniScale (map)Surface waterWater Science and TechnologyRemote sensingHydrological Sciences Journal
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Distribution and spatial structure of pelagic fish schools in relation to the nature of the seabed in the Sicily Channel (Central Mediterranean).

2009

Hydroacoustic data collected during two echosurveys carried out in the Sicily Channel in 1998 and 2002 were analysed to investigate the distribution and spatial structure of small pelagic fish species in relation to the sedimentological nature of the sea bottom. The study was carried out on two contiguous areas (labelled ZONE 1 and ZONE 2) of the continental shelf off the southern coast of Sicily, characterised by different dominant texture, ‘sand’ for ZONE 1 and ‘clayey-silt’ for ZONE 2. Simultaneous information on small pelagic fish schools and the seabed was obtained using a quantitative echo-sounder (SIMRAD EK500) that measures echoes due to the scattering from both fish schools and the…

geographygeography.geographical_feature_categoryacoustic surveySicily ChannelEcologyContinental shelffish schoolFishingPelagic zoneseabedAquatic ScienceSubstrate (marine biology)Demersal zoneEcho soundingOceanographyacoustic surveys; bottom and fish backscattering; echo-sounder; fish school; seabed; Sicily Channel.bottom and fish backscatteringGranulometryecho-sounderEcology Evolution Behavior and SystematicsSeabedGeology
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