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In many parts of the world, freshwater is a subject of frequent and intense large-scale disturbances. Pollution, water withdrawal, alteration of freshwater flows, road construction, aquifer mining, surface water diversion, desertification, wetland drainage, soil erosion in agriculture, deforestation, and dam building have led to some irreversible species losses and severe changes in community compositions of freshwater ecosystems. Pollution represents one of the most relevant impacts on freshwater environments, ranging from surface water bodies—such as springs, streams, rivers, lakes, and intermittent waterbodies—to groundwater and transitional habitats between surface waters and groundwaters. The origins and fates of pollutants are different and depend on various pollutants, including fertilizers with pesticides in agricultural areas, heavy metals, chlorinated organic compounds, and polycyclic aromatic hydrocarbons (PAHs), which are predominantly derived from industrial and urban settlements. Another pollutant is microplastics, which can increase in concentration in freshwater bodies and constitute emerging contaminants in freshwater systems when taken together with pharmaceuticals, personal care products (PCPs), and endocrine-disrupting compounds (EDCs). The broad distribution of several pollutants leads to significant changes of freshwater ecosystems, together with the extinction of the most sensitive species or the drastic lowering in abundances of others, thus altering community compositions and the ecosystem services provided by freshwater biodiversity.
multiple stressors --- pesticides --- freshwater ecology --- ecotoxicology --- synergism --- resource limitation --- population density --- groundwater --- karst aquifer --- pollution --- quarry --- Apuan Alps --- groundwater ecology --- stygofauna --- stygobite --- aquifer --- syncarida --- crustaceans --- copepods --- stygobiotic --- traits --- nitrate --- ammonium --- nitrite --- nitrogen --- contamination --- AQUALIFE software --- groundwater dependent ecosystems --- threats --- biodiversity --- abundance-size scaling theory --- benthos --- hyporheos --- freshwater communities --- pharmaceuticals --- large scale survey --- Biolog EcoPlatesTM --- flow cytometry --- microbial community --- metabolic fingerprint --- groundwater quality --- hydrogeochemistry --- Chironomidae --- Chironomus plumosus larvae --- mentum deformities --- freshwater contamination --- Lake Trasimeno --- platinum --- bioaccumulation --- passive sample --- freshwater clam --- Corbicula fluminalis africana --- diet --- Triturus carnifex --- mountain karst ponds --- microplastics --- heavy metals --- EOCs --- landfill --- marble slurry --- neonicotinoids --- software
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Ground penetrating radar (GPR) has become one of the key technologies in subsurface sensing and, in general, in non-destructive testing (NDT), since it is able to detect both metallic and nonmetallic targets. GPR for NDT has been successfully introduced in a wide range of sectors, such as mining and geology, glaciology, civil engineering and civil works, archaeology, and security and defense. In recent decades, improvements in georeferencing and positioning systems have enabled the introduction of synthetic aperture radar (SAR) techniques in GPR systems, yielding GPR–SAR systems capable of providing high-resolution microwave images. In parallel, the radiofrequency front-end of GPR systems has been optimized in terms of compactness (e.g., smaller Tx/Rx antennas) and cost. These advances, combined with improvements in autonomous platforms, such as unmanned terrestrial and aerial vehicles, have fostered new fields of application for GPR, where fast and reliable detection capabilities are demanded. In addition, processing techniques have been improved, taking advantage of the research conducted in related fields like inverse scattering and imaging. As a result, novel and robust algorithms have been developed for clutter reduction, automatic target recognition, and efficient processing of large sets of measurements to enable real-time imaging, among others. This Special Issue provides an overview of the state of the art in GPR imaging, focusing on the latest advances from both hardware and software perspectives.
Ground Penetrating Radar (GPR) --- Unmanned Aerial Vehicles (UAVs) --- Synthetic Aperture Radar (SAR) --- Real Time Kinematic (RTK) --- Ultra-Wide-Band (UWB) --- landmine and IED detection --- non-destructive testing --- GPR --- coherence --- semblance --- attribute analysis --- imaging --- GPR trace --- high-resolution data --- large-scale survey --- archaeological prospection --- Ground-Penetrating Radar --- velocity analysis --- coherency functionals --- GPR data processing --- GPR data migration --- spatial-variant convolution neural network (SV-CNN) --- spatial-variant convolution kernel (SV-CK) --- radar image enhancing --- MIMO radar --- neural networks --- imaging radar --- ground penetrating radar --- wavelet scattering network --- machine learning --- support vector machine --- pipeline identification --- snow --- snow water equivalent (SWE) --- stepped-frequency continuous wave radar (SFCW) --- software defined radio (SDR) --- snowpack multilayer reflectance --- Ground Penetrating Radar --- Synthetic Aperture Radar --- landmine --- Improvised Explosive Device --- radar --- noise attenuation --- Gaussian spike impulse noise --- deep convolutional denoising autoencoders (CDAEs) --- deep convolutional denoising autoencoders with network structure optimization (CDAEsNSO) --- applied geophysics --- digital signal processing --- enhancement of 3D-GPR datasets --- clutter noise removal --- spectral filtering --- ground-penetrating radar --- nondestructive testing --- pipelines detection --- modeling --- signal processing --- n/a
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