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Changes in sea surface roughness are usually associated with a change in the sea surface wind field. This interaction has been exploited to measure sea surface wind speed by scatterometry. A number of features on the sea surface associated with changes in roughness can be observed by synthetic aperture radar (SAR) because of the change in Bragg backscatter of the radar signal by damping of the resonant ocean capillary waves. With various radar frequencies, resolutions, and modes of polarization, sea surface features have been analyzed in numerous campaigns, bringing various datasets together, thus allowing for new insights into small-scale processes at a larger areal coverage. This Special Issue aims at investigating sea surface features detected by high spatial resolution radar systems, such as SAR.

dispersion curve filtering --- n/a --- Synthetic Aperture Radar --- RADARSAT Constellation Mission (RCM) --- marine X-band radar --- compact polarization (CP) --- cross-polarization --- proper orthogonal decomposition --- rain --- right circular horizontal polarization model --- support vector machines --- Sentinel-1 --- wind speed --- wave height --- hurricane --- ocean surface waves --- SMAP --- Copernicus --- synthetic aperture radar --- co-polarized phase difference --- synthetic aperture radar (SAR) --- oceans --- fetch- and duration-limited wave growth relationships --- Wake detection --- air-sea interaction --- phase-resolved wave fields --- wind --- SAR --- CoVe-Pol and CoHo-Pol models --- Baltic Sea --- wind retrieval --- ocean surface wind speed retrieval --- CMEMS --- detectability model --- right circular vertical polarization model --- hurricane internal dynamical process --- ocean winds --- polarimetry --- sea surface roughness --- eyewall replacement cycles --- GF-3 --- dual-polarization --- quad-polarized SAR --- typhoon/hurricane-generated wind waves --- coast and ocean observation --- radar --- geophysical model function (GMF) --- Doppler radar

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Twelve edited original papers on the latest and state-of-art results of topics ranging from calibration, validation, and science to a wide range of applications using ALOS-2/PALSAR-2. We hope you will find them useful for your future research.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- Sentinel-1 --- ALOS/PALSAR-2 --- land subsidence --- accuracy assessment --- Alexandria City --- Egypt --- local climate zone --- random forest --- feature importance --- land surface temperature --- grid cells --- Sentinel-2 --- PALSAR-2 --- ASTER --- soil moisture --- ALOS-2 --- GA-BP --- water cloud model --- L-band --- SAR --- backscattering --- soil moisture content --- LAI --- HH and HV polarization --- flood --- NoBADI --- Florida --- Hurricane Irma --- synthetic aperture radar --- polarimetric radar --- co-polarized phase difference --- radar scattering --- vegetation --- radar applications --- agriculture --- leaf area index --- leave-one-out cross-validation --- oil palm --- radar vegetation index --- vegetation descriptors --- ecosystem carbon cycle --- L-band SAR --- vegetation index --- random forest regression --- plantation --- permafrost --- InSAR --- Qinghai-Tibet Plateau --- ALOS --- thermal melting collapse --- Sentinel-1A --- SBAS-InSAR --- heavy forest area --- potential landslide identification --- SAR-based landslide detection --- Growing Split-Based Approach (GSBA) --- Hokkaido landslide --- Putanpunas landslide --- SAR polarimetry --- model-free 3-component decomposition for full polarimetric data (MF3CF) --- radar polarimetry --- calibration --- Faraday rotation

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Synthetic aperture radar (SAR) interferometry (InSAR) is an important remote sensing technology used for topographic mapping and deformation monitoring, and has created a new type of radar datum that has significantly evolved during the last couple of decades. This book includes the latest InSAR studies published in the Special Issue “InSAR Signal and Data Processing” of Sensors. We hope that readers of all levels will be able to gain a better understanding of InSAR as well as the when, how, and why of applying this technology.

Research & information: general --- Geography --- time-series InSAR --- subsidence --- GNSS --- coastal urban area --- heterogeneous array --- SAR imaging --- data cross-placement --- computing resource management --- Gaofen-3 satellite --- ScanSAR --- interferometry --- interferometric coherence --- phase compensation --- DEM geolocation --- InSAR --- Qinghai-Tibet Engineering Corridor --- deformation --- permafrost --- interferometric synthetic aperture radar (InSAR) --- phase error calibration --- phase difference measurement --- under-sampling --- coherent accumulation --- SBAS-InSAR --- rock salt mine --- drilling solution mining --- time series --- phase unwrapping (PU) --- multi-baseline (MB) --- two-stage programming approach (TSPA) --- phase unwrapping max-flow/min-cut (PUMA) --- multibaseline interferometric synthetic aperture radar (InSAR) --- non-subsampled shearlet transform (NSST) --- kurtosis --- noise level eatimation --- coherence coefficient --- DEM --- DSM --- hierarchical adaptive surface fitting --- markov random field --- residue --- persistent scatterers --- polarimetric optimization --- deformation monitoring --- interferometric radar --- helicopter landing --- simulation model --- n/a

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This Special Issue reports on recent research trends in hydraulics, hydrodynamics, and hydroinformatics, and their novel applications in practical engineering. The Issue covers a wide range of topics, including open channel flows, sediment transport dynamics, two-phase flows, flow-induced vibration and water quality. The collected papers provide insight into new developments in physical, mathematical, and numerical modelling of important problems in hydraulics and hydroinformatics, and include demonstrations of the application of such models in water resources engineering.

History of engineering & technology --- chute aerator --- spillway bottom --- air concentration --- air bubble frequency --- air bubble chord length --- evolution of precipitation --- model simulation --- information entropy theory --- desert–oasis areas --- Tarim Basin --- gravity wave model --- dam-break flood --- image processing technology --- experimental study --- cavitation bubble --- high-speed photography --- impact pressure --- micro-jet --- Ningxia–Inner Mongolia --- Yellow River --- riverbank collapse --- BSTEM model --- flood &amp --- dry season --- sediment transport --- finite crest length weir --- FGP (flaring gate pier) --- discharge coefficient --- subcritical flow --- river flow modeling --- sediment transport simulation --- automation of flow modeling --- HEC-RAS controller --- python scripting --- three-dimensional aerator --- multi-horizontal-submerged jets --- energy dissipation --- near-field vibration --- fluctuating pressure --- gate-opening modes --- collapse near a wall --- double cavitation bubble --- tilt distribution cavitation --- parallel cavitation --- pseudopotential lattice Boltzmann model --- numerical simulation --- pooled stepped spillway --- pool weir --- flow property --- surface-piercing propeller --- artificial ventilation --- hydrodynamic performance --- LES-VOF method --- flow-induced vibration --- plane gate --- numerical analysis --- bridge scour --- submerged flow --- physical hydraulic modeling --- ski-jump flow --- spillway outlet --- jet trajectory --- experimental model --- rainfall intensity distribution --- two water jets --- collision in air --- Gaussian distribution --- trajectory line --- clogging --- drip irrigation --- flushing --- particle size distribution --- sediments --- submerged jets --- aerated flow --- plunge pool --- trapezoidal cross-section --- U-shaped channel --- radius-to-width ratio --- slope coefficient --- hydraulic characteristics --- hydraulic jump --- Froude number --- stilling basin with shallow-water cushion (SBSWC) --- large eddy simulation --- best depth --- CFD–DEM coupling --- hydrocyclone --- particle shape --- particle size --- water and sediment separation --- stepped dropshaft --- flow region --- central angle of step --- free surface measurement --- optical motion capturing --- tank test --- wave gauge --- sloshing --- offset jet --- potential core --- decay rate --- k-ε model --- abutment --- overtopping flow --- pressure flow --- scour and velocity field --- Y-shaped confluence channel --- non-submerged rigid vegetation --- longitudinal velocity --- secondary flow --- turbulent kinetic energy --- wetland --- lattice Boltzmann method --- shallow lake --- drag force --- water-saving irrigation development level --- Sichuan province --- TOPSIS method --- experiment --- particle image velocimetry --- 3D confined wall jet --- mean flow --- multiple bubble collapse --- pressure wave energy --- energy conversion rate --- consistent particle method --- solitary wave --- submerged breakwater --- breaking wave --- vortex --- free surface flow --- embankment weir --- bridge piers --- turbulence --- CFD --- sediment --- transforming mechanism --- open channel bend --- velocity distribution --- PIV --- hyporheic exchange --- surface−groundwater flow process --- influencing factors --- orthogonal tests --- sensitivity analysis --- linearly moved irrigation system --- application depth --- moving speed --- uniformity coefficient --- tidal discharge --- phase difference --- tidal channel junction --- flow division --- fluvial acoustic tomography --- wavelet analysis --- DEM --- hydrodynamic modelling --- river bathymetry --- floods --- Bathy-supp --- coherent vortex structure --- backward-facing step --- synchronized PIV --- separation and reattachment --- free shear layer --- vortical evolution

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This Special Issue reports on recent research trends in hydraulics, hydrodynamics, and hydroinformatics, and their novel applications in practical engineering. The Issue covers a wide range of topics, including open channel flows, sediment transport dynamics, two-phase flows, flow-induced vibration and water quality. The collected papers provide insight into new developments in physical, mathematical, and numerical modelling of important problems in hydraulics and hydroinformatics, and include demonstrations of the application of such models in water resources engineering.

History of engineering & technology --- chute aerator --- spillway bottom --- air concentration --- air bubble frequency --- air bubble chord length --- evolution of precipitation --- model simulation --- information entropy theory --- desert–oasis areas --- Tarim Basin --- gravity wave model --- dam-break flood --- image processing technology --- experimental study --- cavitation bubble --- high-speed photography --- impact pressure --- micro-jet --- Ningxia–Inner Mongolia --- Yellow River --- riverbank collapse --- BSTEM model --- flood &amp --- dry season --- sediment transport --- finite crest length weir --- FGP (flaring gate pier) --- discharge coefficient --- subcritical flow --- river flow modeling --- sediment transport simulation --- automation of flow modeling --- HEC-RAS controller --- python scripting --- three-dimensional aerator --- multi-horizontal-submerged jets --- energy dissipation --- near-field vibration --- fluctuating pressure --- gate-opening modes --- collapse near a wall --- double cavitation bubble --- tilt distribution cavitation --- parallel cavitation --- pseudopotential lattice Boltzmann model --- numerical simulation --- pooled stepped spillway --- pool weir --- flow property --- surface-piercing propeller --- artificial ventilation --- hydrodynamic performance --- LES-VOF method --- flow-induced vibration --- plane gate --- numerical analysis --- bridge scour --- submerged flow --- physical hydraulic modeling --- ski-jump flow --- spillway outlet --- jet trajectory --- experimental model --- rainfall intensity distribution --- two water jets --- collision in air --- Gaussian distribution --- trajectory line --- clogging --- drip irrigation --- flushing --- particle size distribution --- sediments --- submerged jets --- aerated flow --- plunge pool --- trapezoidal cross-section --- U-shaped channel --- radius-to-width ratio --- slope coefficient --- hydraulic characteristics --- hydraulic jump --- Froude number --- stilling basin with shallow-water cushion (SBSWC) --- large eddy simulation --- best depth --- CFD–DEM coupling --- hydrocyclone --- particle shape --- particle size --- water and sediment separation --- stepped dropshaft --- flow region --- central angle of step --- free surface measurement --- optical motion capturing --- tank test --- wave gauge --- sloshing --- offset jet --- potential core --- decay rate --- k-ε model --- abutment --- overtopping flow --- pressure flow --- scour and velocity field --- Y-shaped confluence channel --- non-submerged rigid vegetation --- longitudinal velocity --- secondary flow --- turbulent kinetic energy --- wetland --- lattice Boltzmann method --- shallow lake --- drag force --- water-saving irrigation development level --- Sichuan province --- TOPSIS method --- experiment --- particle image velocimetry --- 3D confined wall jet --- mean flow --- multiple bubble collapse --- pressure wave energy --- energy conversion rate --- consistent particle method --- solitary wave --- submerged breakwater --- breaking wave --- vortex --- free surface flow --- embankment weir --- bridge piers --- turbulence --- CFD --- sediment --- transforming mechanism --- open channel bend --- velocity distribution --- PIV --- hyporheic exchange --- surface−groundwater flow process --- influencing factors --- orthogonal tests --- sensitivity analysis --- linearly moved irrigation system --- application depth --- moving speed --- uniformity coefficient --- tidal discharge --- phase difference --- tidal channel junction --- flow division --- fluvial acoustic tomography --- wavelet analysis --- DEM --- hydrodynamic modelling --- river bathymetry --- floods --- Bathy-supp --- coherent vortex structure --- backward-facing step --- synchronized PIV --- separation and reattachment --- free shear layer --- vortical evolution