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<br />WATER COLUMN <br />ICE <br />/I 0 <br />KEY <br />1. Ice thickness <br />(above water surface) <br />2. Ice thickness <br />(below water surface) <br />3. Water surface (in hole) <br />A. Total ice thickness (1+2) <br />B. Depth of water under <br />solid ice (3-2) <br />i Figure 4, Cross-section of solid ice and associated water depth and ice <br />thickness measurements. Velocity measurements at 0.2, 0.6, and <br />0.8 depth are indicated. <br />KEY <br />1. Ice thickness <br />(above water surface) <br />2. Ice thickness <br />(below water surface) <br />3. Water surface (in hole) <br />4. Thickness of frazil <br />ice in hole <br />A. Total ice thickness (1+2) <br />B. Depth of water under <br />solid ice (3-2) <br />C. Actual frazil ice <br />thickness below solid ice <br />D. Depth of water under <br />frazil ice (3-4) <br />Figure 5. Cross-section of solid ice, frazil ice, and associated water <br />depth and ice thickness measurements. Velocity measurements at <br />0.2, 0.6, and 0.8 depth are indicated. <br />13