Search results for "Submerged"

Wetland Restoration with Hydrophytes: A Review

2021

Restoration cases with hydrophytes (those which develop all their vital functions inside the water or very close to the water surface, e.g., flowering) are less abundant compared to those using emergent plants. Here, I synthesize the latest knowledge in wetland restoration based on revegetation with hydrophytes and stress common challenges and potential solutions. The review mainly focusses on natural wetlands but also includes information about naturalized constructed wetlands, which nowadays are being used not only to improve water quality but also to increase biodiversity. Available publications, peer-reviewed and any public domain, from the last 20 years, were reviewed. Several countrie…

On the processing of field spectroradiometric data for remote sensing mapping of submerged vegetation in coastal zones and lagoon environments

2008

Antifouling Mortars for Underwater Restoration

2022

This research has focused on the assessment of the compositional features and mechanical and antifouling performances of two different mortars formulated for an underwater setting, and which contain Mg(OH)2 as an antifouling agent. Regarding the mechanical characterization, the uniaxial compressive strength and flexural strength were measured. The composition of the materials was explored by differential thermal/thermogravimetric analysis (DTA-TG), X-ray diffraction analysis (XRPD), and scanning electronic microscopy (SEM) coupled with EDS microanalysis. The assessment of the biological colonization was evaluated with colorimetric analysis and image analysis. The results suggest that both m…

Toward an update of the structural model in Italian submerged areas: contributions from the EMODnet Geology Project

2016

The European Marine Observation and Data Network (EMODNet) Project aims at the collection of as many existing data as possible on European Seas to be represented on digital maps at the 1:250,000 scale, accessible via web through a dedicated portal. It is articulated into different Lots concerning Bathymetry, Geology, Biology, Chemistry, Physics, Physical Habitats, Human activities. The Geology Lot is realized by a Consortium in which the Geological Survey of Italy is partner. EMODnet Geology requires the compilation of a number of layers subdivided into Work Packages (WP), referring to seafloor sediments grainsize, sedimentation rates, Quaternary geology, pre-Quaternary geology and stratigr…

IDENTIFICATION OF BACTERIAL TAXA IN ARCHAEOLOGICAL WATERLOGGED WOOD

2014

Summary The microscopic and molecular techniques described in this study are aimed at understanding the degradation processes of the anatomical structure of submerged archaeological wood, correlating it to the degradation induced by bacteria. The SEM micrographs showed alterations of the wooden structure due to bacterial colonization, as well as the presence of pyrite framboids. The difficulty of extracting bacterial DNA from wooden fragments belonging to submerged finds is well-known, due to the presence of many inhibitors; this study describes some extraction and in vitro amplification protocols for wooden submerged finds. The results of the molecular investigations, based on the analysis…

Effect of two distinct implant macro-designs on the osseointegration of bicortically installed implants in two topographic sites. A histomorphometric…

2019

Antecedentes científicos y objetivos de estudio: El uso de implantes dentales como alternativa para la rehabilitación oral ha demostrado su eficacia y mostrando altas tasas de supervivencia. Un aspecto clave de la osteointegración del implante dental está relacionado con la obtención de una estabilidad primaria adecuada, asegurada por el enclavamiento mecánico entre el tejido óseo y la interfaz del implante, la cual depende en parte de la geometría del implante, la rugosidad de la superficie y la técnica quirúrgica para la preparación del lecho implantario. Varios factores están involucrados en la interacción entre la superficie del implante y el hueso nativo circundante durante la osteoint…

Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses

2021

The submerged hydraulic jump is a sudden change from the supercritical to subcritical flow, specified by strong turbulence, air entrainment and energy loss. Despite recent studies, hydraulic jump characteristics in smooth and rough beds, the turbulence, the mean velocity and the flow patterns in the cavity region of a submerged hydraulic jump in the rough beds, especially in the case of triangular macroroughnesses, are not completely understood. The objective of this paper was to numerically investigate via the FLOW-3D model the effects of triangular macroroughnesses on the characteristics of submerged jump, including the longitudinal profile of streamlines, flow patterns in the cavity regi…