Wetsuits Raises the Bar Once Again, in Both Design and Technological Advances
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Winds, Waves, and Bubbles at the Air-Sea Boundary
JEFFREY L. HANSON WINDS, WAVES, AND BUBBLES AT THE AIR-SEA BOUNDARY Subsurface bubbles are now recognized as a dominant acoustic scattering and reverberation mechanism in the upper ocean. A better understanding of the complex mechanisms responsible for subsurface bubbles should lead to an improved prediction capability for underwater sonar. The Applied Physics Laboratory recently conducted a unique experiment to investigate which air-sea descriptors are most important for subsurface bubbles and acoustic scatter. Initial analyses indicate that wind-history variables provide better predictors of subsurface bubble-cloud development than do wave-breaking estimates. The results suggest that a close coupling exists between the wind field and the upper-ocean mixing processes, such as Langmuir circulation, that distribute and organize the bubble populations. INTRODUCTION A multiyear series of experiments, conducted under the that, in the Gulf of Alaska wintertime environment, the auspices of the Navy-sponsored acoustic program, Crit amount of wave-breaking activity may not be an ideal ical Sea Test (CST), I has been under way since 1986 with indicator of deep bubble-cloud formation. Instead, the the charter to investigate environmental, scientific, and penetration of bubbles is more closely tied to short-term technical issues related to the performance of low-fre wind fluctuations, suggesting a close coupling between quency (100-1000 Hz) active acoustics. One key aspect the wind field and upper-ocean mixing processes that of CST is the investigation of acoustic backscatter and distribute and organize the bubble populations within the reverberation from upper-ocean features such as surface mixed layer. waves and bubble clouds. -
2015 XTERRA COMPETITION RULES 1. Swim
2015 XTERRA COMPETITION RULES 1. Swim: 1.1. Wetsuits: are allowed based on water temperature measured the day prior to the event and confirmed the day of the event. Where water temperatures are close to limits, the decision will be made one hour before the start of the first swim. Pro/Elite Athletes: Wetsuits are allowed for pro athletes if the water temperature is below 68 degrees Fahrenheit (20 degrees Centigrade). Age Group Athletes: Wetsuits are allowed for age group athletes if the water temperature is below 72 degrees Fahrenheit (22 degrees C) Mandatory Wetsuit: Wetsuits are mandatory below 57 degrees F (14 degrees C) Challenged Athletes: Wetsuits are allowed but not required at 1 any water temperature. Note: XTERRA follows the Swim Rules for Wetsuit Use established by the ITU at all XRC events. See Section D.2 in the ITU Competition Rules for specific details. Note: The XTERRA/ITU rules may be waived by the XPS race directors in favor of USA Triathlon Swimming Conduct rules. See Section 4 of the USA Triathlon Rules for specific details. o Note: If a race is governed by the USAT Article IV Swimming 2 Conduct rules – the following portion of Section 4.4 will apply: “When the water temperature is greater than 78 degrees, but less than 84 degrees Fahrenheit, age group participants may wear a wetsuit at their own discretion, provided however that participants who wear a wetsuit within this temperature range shall not be eligible for prizes or awards.” Specifically: the athlete will not be eligible for XTERRA Points. -
Hypothermia (Pg 129-130)
Excerpts from: Whitewater Rescue Manual By Charles Walbridge & Wayne A. Sundmacher Sr. Charlie Walbridge is one of the first seven individuals inducted into the International Whitewater Hall of Fame. He is being recognized for his many contributions to the whitewater safety and rescue field. Charlie has conducted numerous swiftwater rescue clinics for NRS associates and we're proud to be associated with him! The International Whitewater Hall of Fame and Museum is located at the Adventure Sports Center International, McHenry, Maryland Cold-Water Protection (Pg 24-25) Water draws heat from the body 25 times faster than air. Like windchill, the effects of cold water increase when the current is fast. Sudden immersion in snowmelt or spring runoff is extremely debilitating, causing a substantial loss of strength, coordination, and judgment rather quickly. All cold-weather paddlers should select the gear needed for the insulation required to stay warm. Drysuits and wetsuits both work effectively in cold water. In a wetsuit, air is trapped inside the neoprene material, and the suit fits snugly enough to keep most cold water out. What little water gets inside is quickly warmed by the user's body heat. Drysuits create an actual barrier between the environment and the paddler, eliminating that initial “cold-water shock.” Paddling drysuits are made of a waterproof material with latex seals at the neck, wrists, and ankles. The paddler regulates the inside temperature by adding or removing layers of insulation, such as pile or polypropylene. In milder weather, a water-proof shell top or paddle jacket can be combined with pile clothing or a wetsuit for comfort. -
Fusion System Components
A Step Change in Military Autonomous Technology Introduction Commercial vs Military AUV operations Typical Military Operation (Man-Portable Class) Fusion System Components User Interface (HMI) Modes of Operation Typical Commercial vs Military AUV (UUV) operations (generalisation) Military Commercial • Intelligence gathering, area survey, reconnaissance, battlespace preparation • Long distance eg pipeline routes, pipeline surveys • Mine countermeasures (MCM), ASW, threat / UXO location and identification • Large areas eg seabed surveys / bathy • Less data, desire for in-mission target recognition and mission adjustment • Large amount of data collected for post-mission analysis • Desire for “hover” ability but often use COTS AUV or adaptations for specific • Predominantly torpedo shaped, require motion to manoeuvre tasks, including hull inspection, payload deployment, sacrificial vehicle • Errors or delays cost money • Errors or delays increase risk • Typical categories: man-portable, lightweight, heavy weight & large vehicle Image courtesy of Subsea Engineering Associates Typical Current Military Operation (Man-Portable Class) Assets Equipment Cost • Survey areas of interest using AUV & identify targets of interest: AUV & Operating Team USD 250k to USD millions • Deploy ROV to perform detailed survey of identified targets: ROV & Operating Team USD 200k to USD 450k • Deploy divers to deal with targets: Dive Team with Nav Aids & USD 25k – USD 100ks Diver Propulsion --------------------------------------------------------------------------------- -
Low-Frequency Active Towed Sonar
LOW-FREQUENCY ACTIVE TOWED SONAR Full-feature, long-range, low-frequency active and passive variable depth sonar (VDS) The Low-Frequency Active Sonar (LFATS) system is used on ships to detect, track and engage all types of submarines. L3Harris specifically designed the system to perform at a lower operating frequency against modern diesel-electric submarine threats. FEATURES > Compact size - LFATS is a small, > Full 360° coverage - a dual parallel array lightweight, air-transportable, ruggedized configuration and advanced signal system processing achieve instantaneous, > Specifically designed for easy unambiguous left/right target installation on small vessels. discrimination. > Configurable - LFATS can operate in a > Space-saving transmitter tow-body stand-alone configuration or be easily configuration - innovative technology integrated into the ship’s combat system. achieves omnidirectional, large aperture acoustic performance in a compact, > Tactical bistatic and multistatic capability sleek tow-body assembly. - a robust infrastructure permits interoperability with the HELRAS > Reverberation suppression - the unique helicopter dipping sonar and all key transmitter design enables forward, aft, sonobuoys. port and starboard directional LFATS has been successfully deployed on transmission. This capability diverts ships as small as 100 tons. > Highly maneuverable - own-ship noise energy concentration away from reduction processing algorithms, coupled shorelines and landmasses, minimizing with compact twin-line receivers, enable reverb and optimizing target detection. short-scope towing for efficient maneuvering, fast deployment and > Sonar performance prediction - a unencumbered operation in shallow key ingredient to mission planning, water. LFATS computes and displays system detection capability based on modeled > Compact Winch and Handling System or measured environmental data. - an ultrastable structure assures safe, reliable operation in heavy seas and permits manual or console-controlled deployment, retrieval and depth- keeping. -
Dive Kit List Intro
Dive Kit List Intro We realise that for new divers the array of dive equipment available can be slightly daunting! The following guide should help you choose dive gear that is suitable for your Blue Ventures expedition, without going overboard. Each section will highlight features to consider when choosing equipment, taking into account both budget and quality. Diving equipment can be expensive so we don’t want you to invest in something that will turn out to be a waste of money or a liability during your expedition! Contents Must haves Mask Snorkel Fins Booties Exposure protection DSMB and reel Slate and pencils Dive computer Dive manuals Highly recommended Cutting tool Compass Underwater light Optional Regulator BCD Dry bag Extra stuff Contact us Mask Brands: Aqualung, Atomic, Cressi, Hollis, Mares, Oceanic, Scubapro, Tusa Recommended: Cressi Big Eyes. Great quality for a comparatively lower price. http://www.cressi.com/Catalogue/Details.asp?id=17 Oceanic Shadow Mask. Frameless mask, which makes it easy to put flat into your luggage or BCD pocket. http://www.oceanicuk.com/shadow-mask.html Aqualung Linea Mask. Keeps long hair from getting tangled in the buckle while also being frameless. https://www.aqualung.com/us/gear/masks/item/74-linea Tusa neoprene strap cover. Great accessory for your mask in order to keep your hair from getting tangled in the mask and increasing the ease of donning and doffing your mask. http://www.tusa.com/eu-en/Tusa/Accessories/MS-20_MASK_STRAP To be considered: The most important feature when you buy a mask is fit. The best way to find out if it is the right mask for you is to place the mask against your face as if you were wearing it without the strap, and inhaling through your nose. -
Water Covers 70 Percent of the Earth. Scuba Diving Allows You to See What You’Re Missing
Department ADVENTURE Water covers 70 percent of the Earth. Scuba diving allows you to see what you’re missing. by AMANDA CASTLEMAN Somersault off the boat, into the deep blue. Drift down to the wreck or the reef. Or maybe towards some rock formations, sculpted long before a cavern flooded. The slightest kick sends your shadow gliding across the bottom. A whisper of breath buoys you up, chasing a flash of color. Immersed, you hover, freed from the gravity and worries of the noisy surface. Diving is as close as most of us will ever come to a spacewalk. But passion for the underwater world traces back much further than the first moon landing. Ancient Greeks held their breath to plunge Gran Cenote, Riviera for pearls and sponges—and legend claims one Maya, Mexico. breathed through a reed while he cut the moorings of the Persian fleet. Alexander the Great also descended beneath the waves in a glass barrel at the siege of Tyre, according to Aristotle. w Stills + Motion/Christian Vizl; (facing) Getty Images/Alastair Pollock Photography. Photos: Tandem 2 Summer 2014 Summer 2014 3 The desire to explore runs deep. By the 16th Giant ray. century, diving bells pumped air to adventurers and leather suits protected them to depths of 60 feet. Three hundred years later, technology leapt forward as scientists discovered the effects of water pressure and breathing compressed air. The U.S. military pioneered scuba (Self-Contained Underwater Breathing Apparatus) in 1939, then Émile Gagnan and Jacques-Yves Cousteau took the idea mainstream with their 1943 “Aqua-Lung.” Earth’s final frontier, the mysterious wine-dark sea, was open for business. -
Sonar for Environmental Monitoring of Marine Renewable Energy Technologies
Sonar for environmental monitoring of marine renewable energy technologies FRANCISCO GEMO ALBINO FRANCISCO UURIE 350-16L ISSN 0349-8352 Division of Electricity Department of Engineering Sciences Licentiate Thesis Uppsala, 2016 Abstract Human exploration of the world oceans is ever increasing as conventional in- dustries grow and new industries emerge. A new emerging and fast-growing industry is the marine renewable energy. The last decades have been charac- terized by an accentuated development rate of technologies that can convert the energy contained in stream flows, waves, wind and tides. This growth ben- efits from the fact that society has become notably aware of the well-being of the environment we all live in. This brings a human desire to implement tech- nologies which cope better with the natural environment. Yet, this environ- mental awareness may also pose difficulties in approving new renewable en- ergy projects such as offshore wind, wave and tidal energy farms. Lessons that have been learned is that lack of consistent environmental data can become an impasse when consenting permits for testing and deployments marine renew- able energy technologies. An example is the European Union in which a ma- jority of the member states requires rigorous environmental monitoring pro- grams to be in place when marine renewable energy technologies are commis- sioned and decommissioned. To satisfy such high demands and to simultane- ously boost the marine renewable sector, long-term environmental monitoring framework that gathers multi-variable data are needed to keep providing data to technology developers, operators as well as to the general public. Technol- ogies based on active acoustics might be the most advanced tools to monitor the subsea environment around marine manmade structures especially in murky and deep waters where divining and conventional technologies are both costly and risky. -
BEE 453 Chris Chung, Ju Sok Shim May 1St, 2007 Executive Summary
The Effect of the Diving/Wet Suit on the Survival Time in Cold Water Immersion BEE 453 Chris Chung, Ju Sok Shim May 1st, 2007 Executive Summary In this study, we will compare the effect of normal clothes (assumed as bare skin) with effect of wetsuit in maintaining the core body temperature, produced by metabolic heat generations and blood flow heat generation, using COMSOL. A passenger is immersed in cold water after Titanic has shipwrecked, and the individual is waiting for rescue to come in time before his metabolic functions stop and die. We will compare two cases: with and without wetsuit on the passenger. Skin temperature or wetsuit temperature is assumed to be equal to cold water temperature, which is at 10 degrees Celsius, and the distribution of temperature throughout the body will be graphically shown as the time of body immersion in water increases. It is shown from the results that wetsuit can help maintain the normal core body temperature much longer than normal clothes/bare skin can in cold water immersion. Introduction and Design Objective Background and importance of problem: Hypothermia is the decrease in body temperature due to exposure to colder temperatures, losing bodily heat to the surrounding environment. The first stage of hypothermia occurs when body temperature decreases by one to two degrees Celsius from normal body temperature (37 degrees Celsius). In this stage, shivering and numbness in hands occurs. When hypothermia is continued, the body enters the second stage of hypothermia. Body temperature is dropped by two to four degree Celsius, and bodily movements become uncoordinated. -
KYEM Dive Team Committee Overview of Accomplishments
KYEM Dive Team Committee Overview of Accomplishments UNDERWATER RESCUE/RECOVERY TEAM ORGINAZATION *Level 1- Dragging operations (Non-Diver) Level 4- (Meeting level 3 requirements) Recommended Side Scan Sonar Operations Surface Supplied Air and/or Redundant Air Supply (certification) Advanced training inclusive to but not limited to: I.E.: Level 2-Basic “Open Water” SCUBA Certification Deep Dive Basic Gear Mixed Gas Tethered diver Hard Hat Line signals, (Non-verbal communication) Advanced public safety diving course Basic search and recovery techniques Evidence Collection Boat based operations Level 3- (Meeting Level 2 requirements) Full Face Mask (certification) Level 5- (Meeting Level 4 requirements) Drysuit (certification) Hazardous Materials/Environmental Operations Verbal Communications between diver and surface and backup Fully Encapsulated HAZMAT Drysuit line communication Advanced training inclusive to but not limited to: Public Safety Diver Certification I.E.: Independent back-up air supply Vehicle Recovery Cold water/ice operations *A team concept consist of a minimum of 3 qualified and trained divers while recommending initial and annual fit for diving medical evaluations or equivalent, based on your national curriculum. *Level 1 and 2 are not recommended for public safety dive operations. This should be viewed as a stepping stone for level 3 or greater dive teams. *You do not have to be Level 1 to advance to next levels. Dive operations start at level 2. Levels 2-5 are progressive. INDIVIDUAL DIVER TRAINING Matrix Basic Open -
Doppler Sonar Current Indicator 8
DOPPLER SONAR CURRENT INDICATOR 8 Model High-performance current indicator displays accurate speed and current data at five depth layers on a 10.4" color TFT or virtually any VGA monitor utilizing a Black Box system www.furuno.com Obtain highly accurate water current measurements using FURUNO’s reliable acoustic technology. The FURUNO CI-68 is a Doppler Sonar Current The absolute movements of tide Indicator designed for various types of fish and measuring layers are displayed in colors. hydrographic survey vessels. The CI-68 displays tide speed and direction at five depth layers and ship’s speed on a high defi- nition 10.4” color LCD. Using this information, you can predict net shape and plan when to throw your net. Tide vector for Layer 1 The CI-68 has a triple-beam emission system for providing highly accurate current measurement. This system greatly reduces the effects of the Tide vector for Layer 2 rolling, pitching and heaving motions, providing a continuous display of tide information. When ground (bottom) reference is not available Tide vector for Layer 3 acoustically in deep water, the CI-68 can provide true tide current information by receiving position and speed data from a GPS navigator and head- ing data from the satellite (GPS) compass SC- 50/110 or gyrocompass. In addition, navigation Tide vector for Layer 4 information, including position, course and ship ’s track, can also be displayed The CI-68 consists of a display unit, processor Tide vector for Layer 5 unit and transducer. The control unit and display unit can be installed separately for flexible instal- lation. -
A Wetsuit Repair
WETSUIT REPAIR AND WARRANTY FORM PLEASE READ AND FOLLOW THESE INSTRUCTIONS WARRANTY REPAIRS cover anything that appears to have $40 failed under normal use, such as a blown seam, failed Shoulder/sleeve/calf or crotch panel replacement(s) power seam seal or broken zipper. Warranty items are Rear panel delamination (1/2 panel replacement) always repaired free of charge. We expect our suits to last Add hood between 3 to 4 seasons when properly maintained and $80 cared for. Booties and gloves are not expected to last as Full panel replacement (front or rear panel) long as wetsuits. We anticipate our accessories to have a Alterations (varies; subject to approval) useful lifetime between 2 to 3 seasons. This varies from user to user and does not necessarily have to do with the WHAT IS THE PROCESS FOR RETURNING MY WETSUIT? number of times the product is used. We are always willing If your item has been used, it must be sent to the Wetsuit to evaluate your item(s) and are determined to make quality Repairs Facility in Ventura, CA. Please include a valid proof repairs and alterations whenever feasible and possible. of purchase along with your completed repair form. NON-WARRANTY REPAIRS cover damage due to normal wear WETSUIT REPAIRS and tear or damage not caused by a malfunction. For 188 W Santa Clara St example, a blown-out panel, a fin cut, or delamination of Ventura, CA 93001 materials. We offer repairs for these items at a reasonable [email protected] cost. Fit issues and sizing are strictly not covered.