Answer Happy

The top graph in figure 5 shows variations in water
depth (in meters), which change daily with the tide.
17. Describe the tidal variation during this 8-day
period. Are they neap tides, spring tides, or is there a change
from one type to another? What is the tidal range during this time
period, in meters? in feet (1 m = 3.3 ft)?
Sediments and Bay clarity Sediments are an important component of San Francisco Bay because they transport adsorbed toxic substances, provide habitat for benthic organisms, limit light availability and photosynthesis, and are deposited in ports and waterways which require dredging. When most people look at San Francisco Bay, they see a dirty green color that is a strong contrast to the clear blue waters found in parts of the ocean such as the tropical Caribbean Sea. Whereas the visibility in clear tropical waters can be 8 meters (25 feet) or more, the visibility in San Francisco Bay is rarely more than 1 meter (3 feet). This lack of clarity results from an abundance of plankton and sediments that are suspended in the water. Most of the sediment in the bay comes from erosion of rocks in the Sierra Nevada mountains. Sediments are transported by streams and rivers into the delta region and then into the bay (Figure 6). Some sediments sink to the bottom, where they collect as bay mud. Because most of the bay sediment is very small, mud-sized particles, it can remain suspended in the water column for many days (Figure 7). Daily tidal currents stir up water in the bay, which helps to keep sediments suspended and also re-suspended sediments that were previously deposited (Figure 5). Depth, (m) 18.0 16.5 mmmmmmm 15.0 Current at 123 cm, (cm/s) 100.0 0.0 -100.0 Near-Bottom Temperature, (deg. C) 20.0 18.0 Myy 16.0 Sediment Concentration at 36 cm, (mg/l) 300.0 150.0 0.0 280 281 282 285 286 287 283 Julian Day Figure 5. These data were collected for 8 days, starting October 6, 1994, with an instrument mounted on the bay bottom near the San Mateo Bridge in the South Bay. The technique is being used in San لمين والمساكين