Turn the switch on again observe that the block

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disaster prevention structure to prevent lateral channel erosion. Turn the switch on again. Observe that the block causes rapid erosion in places not protected. a. Observe the changes. What happens close to the structure? _____________________________________ ________________________________________________________________________________________ b. What happens directly downstream on the same bank as the structure? _____________________________ ________________________________________________________________________________________ c. What happens directly downstream from the structure on the opposite bank? _________________________ _________________________________________________________________________________________________________ Activity 2: Coastal Processes 1. Like most geologic processes, coastal processes involve small changes over long period of times. Therefore, we will look at the effect of day-to-day water movement (low wave height, low energy) and storms (high wave height, high energy). a. Measure sediment thickness at the two marked locations. Write measurement on the chalkboard (in cm). b. The TA will take a picture of the coastline prior to the storm stimulation. c. Replicate a storm by increasing the wave height. Let the model run at storm intensity for 2 minutes. d. Remeasure sediment thickness at the two marked locations. e. The TA will take another picture of the coastline after the storm stimulation. To complete your homework activity, refer to these pictures and the collected data, which will be posted on the Canvas page. 2. Where do you think the most erosion and greatest deposition will occur? _____________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ 3. In the box below, roughly sketch the coastline and indicate where erosion and deposition occurred. Remember to include a scale bar and a north arrow. Beach side Water side
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Lab #6: Streams, Coastlines & Groundwater 91 a. When was the most sediment transported? ___________________________________________________ b. Based on your observations, when did the seawall (bricks) prevent erosion? When did they promote erosion? ________________________________________________________________________________ c. Describe how your predictions about erosion and deposition compared to your findings. ______________ ________________________________________________________________________________________ ________________________________________________________________________________________ Activity 3: Groundwater Processes 1. Write the following terms in the appropriate location on the diagram below. Refer to your pre-lab reading (pg. 88) for definitions. recharge area discharge area water table confined aquifer unconfined aquifer aquitard vadose (unsaturated) zone phreatic (saturated) zone 2. Describe the shape of the water table of your model. _____________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ well num bers water input 1 2 3 4 5 6 7 8 9 10 11 water input water exit stream
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Lab #6: Streams, Coastlines & Groundwater 92 3. For this experiment, read the instructions carefully. a. Have a small syringe with dye, a large syringe with water, a ruler, and a stopwatch ready to use. b. Add one drop of dye to well #6 using the small syringe, then add the contents of the large syringe to the same well (this will help the dye percolate through the sand). c. Time the movement of the dye for one minute. d. At the end of the minute, measure the distance the dye traveled and write down on the space below. Time: 60 seconds Distance: _________________ cm e. Calculate the rate of groundwater flow. Show your calculations and include units. Hint : Groundwater flow = distance ÷ time ___________________ f. What happened to the dye plume as it moved through the sediment?__________________________________ _________________________________________________________________________________________ g. Observe water flowing through the sediment. What determines the flow direction? Refer to your pre-lab reading. __________________________________________________________________________________ h. Now add one drop of dye to well #3 and follow it with water. Does the plume behave differently than it did in well #6? Explain your observations. ____________________________________________________________
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