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Tidal streams tutorial

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Tidal Streams Tutorial. Understanding tidal streams. A basic overview on how to read & understand a tidal stream atlas

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Tidal streams tutorial

  1. 1. TIDAL STREAMS WWW.MARINE-EDUCATION.CO.UK A SIMPLE GUIDE..
  2. 2. ©WWW.MARINE-EDUCATION.CO.UK WHAT ARE TIDAL STREAMS? ▸ A movement of a body of water ▸ Flood = Rising tide ▸ Ebb = Falling tide WHERE CAN I FIND TIDAL STREAM INFORMATION? ▸ Tidal Stream Atlas ▸ Tidal Diamonds on a Chart (see separate tutorial) ▸ Websites ▸ Apps
  3. 3. ©WWW.MARINE-EDUCATION.CO.UK WHY SHOULD I UNDERSTAND TIDAL STREAMS? ▸ Wind vs. Tide = Rougher Conditions ▸ Wind with Tide = Smoother Conditions ▸ Travelling with the tidal stream will make your journey quicker ▸ Travelling against the tidal stream will make your journey slower
  4. 4. ©WWW.MARINE-EDUCATION.CO.UK HOW DO SPRINGS & NEAP TIDES EFFECT TIDAL STREAMS? ▸ Tidal Stream flow will be stronger / faster during Spring Tides when the tidal range is larger. ▸ Tidal Stream flow will be weaker / slower during Neap Tides when the tidal range is smaller.
  5. 5. ©WWW.MARINE-EDUCATION.CO.UK INTERPRETING A TIDAL STREAM ATLAS ▸ Arrows = Direction of flow ▸ Thickness of arrow = Strength of flow i.e. the thicker it is the faster the flow! ▸ Numbers represent the strength/ rate of the flow in knots
  6. 6. ©WWW.MARINE-EDUCATION.CO.UK INTERPRETING A TIDAL STREAM ATLAS - RATE OF FLOW ▸ The first Number shows the rate of flow during a Neap Tide ▸ The second number shows the rate of flow during a Spring Tide. ▸ E.G. 07, 13 = 0.7 knots (Neap Tide) and 1.3 knots (Spring Tide)
  7. 7. ©WWW.MARINE-EDUCATION.CO.UK INTERPRETING A TIDAL STREAM ATLAS - DIRECTION OF FLOW ▸ Arrows = Direction of flow ▸ Place your Plotter inline & in the direction of the arrow to find the flow direction.
  8. 8. ©WWW.MARINE-EDUCATION.CO.UK DIRECTION OF FLOW OVER 12 HOURS ▸ A tidal stream atlas will show the changing direction of flow during the period between Low Water & High Water
  9. 9. ©WWW.MARINE-EDUCATION.CO.UK TIDAL STREAM ATLAS INFORMATION: ▸ Ensure you’re using the right Tidal Stream information for your location ▸ Find the Tidal information for the day you’re going afloat ▸ Insert the tide time and height next to the HW and LW pages ▸ If further detail is required (rather than a rough guide) need to add more detail use a Tidal Curve to calculate the tidal height & time for each hour (see Tidal Curve Tutorial)
  10. 10. MORE FREE TUTORIALS AVAILABLE TO VIEW AT: MARINE-EDUCATION.CO.UK Marine Education - RYA Training Centre WWW.MARINE-EDUCATION.CO.UK

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