Special Issue "Underwater Sensor Nodes and Underwater Sensor Networks" Sensors (ISSN 1424-8220) Website: http://www.mdpi.com/journal/sensors/special_issues/underwater_sens Journal Impact Factor: 1.771 (2010); 5-Year Impact Factor: 1.917 (2010), Q1 in Instruments & Instrumentation Deadline: 15 December 2011 More than the 70% of the earth surface is covered with water (almost all of that is the ocean). New technologies have brought us new ways to monitor and sense aquatic environments. Marine surveillance, pollution detection and monitoring, and oceanographic data collection are needed to explore, protect, and commercial exploit the aquatic environment. Many potential applications exist such as fish and mussels grow observation, deep-sea archaeology, seismic and volcanic prediction, oil monitoring and so on. This special issue tries to collect the recent advances on underwater sensors and underwater sensor networks to measure, monitor, surveillance and control underwater environments. Because of the environment nature, many features must be taken into account: the need of large number of nodes, limited energy of the nodes, short-distance radio communications, large propagation latency, low bandwidth capacity and high error rate. All these constraints make underwater sensors and underwater sensor networks a special case of the regular ones. Topics of interest of this special issue include, but are not limited to, the following topics: - Sensor nodes to measure water parameters (salinity, conductivity, turbidity, pH, oxygen, temperature, depth, etc.) - Sediments and pollution sensor nodes - Acoustic sensors - Underwater sensor network architectures - Wired and wireless protocols for underwater sensor networks - Localization systems for underwater wireless sensor networks - Target tracking using underwater sensor networks - Optical, acoustic and electromagnetic communications for underwater sensor networks - Modems for underwater sensor networks - Study cases, implementations and real deployments of underwater sensor networks - Routing protocols specialized for underwater wireless sensor networks - Cooperation in underwater sensor networks - Modeling and simulation in underwater sensor networks - Data collection, storage, and retrieval by underwater sensor network Submission Manuscripts should be submitted online at www.mdpi.com by registering at (http://www.mdpi.com/user/register/) and logging in to this website (http://www.mdpi.com/user/login/). Once you are registered, go to the submission form (http://www.mdpi.com/user/manuscripts/upload/?journal=sensors). Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website. Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page (http://www.mdpi.com/journal/sensors/instructions). Sensors is an international peer-reviewed Open Access monthly journal published by MDPI. Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this Open Access journal is 1600 CHF (Swiss Francs). Guest Editor Prof. Dr. Jaime Lloret Mauri Instituto de Investigaci�n para la Gesti�n Integrada de Zonas Costeras (IGIC) Universidad Polit�cnica de Valencia, Camino Vera s/n, 46022, Valencia, Spain E-mail: jlloret@dcom.upv.es