Consider a river that spreads out in a delta region on its way to the sea. Construct a problem in which you calculate the average speed at which water moves in the delta region, based on the speed at which it was moving up river. Among the things to consider are the size and flow rate of the river before it spreads out and its size once it has spread out. You can construct the problem for the river spreading out into one large river or into multiple smaller rivers.
Consider a river that spreads out in a delta region on its way to the sea. Construct a problem in which you calculate the average speed at which water moves in the delta region, based on the speed at which it was moving up river. Among the things to consider are the size and flow rate of the river before it spreads out and its size once it has spread out. You can construct the problem for the river spreading out into one large river or into multiple smaller rivers.
Consider a river that spreads out in a delta region on its way to the sea. Construct a problem in which you calculate the average speed at which water moves in the delta region, based on the speed at which it was moving up river. Among the things to consider are the size and flow rate of the river before it spreads out and its size once it has spread out. You can construct the problem for the river spreading out into one large river or into multiple smaller rivers.
b)As the air sinks down, it is channeled through narrow valleys and so speeds up. In the desert the wind blows at about 5 miles per hour across an area of 100 square miles (width x height in the atmosphere). It is then squeezed into an area of just 20 square miles as it blows through narrow valleys in the mountains around Los Angeles. Assume that airflow must stay constant, what would the velocity of the air be? (2)
Airflow = area * velocity
c) Vegetation has to be heated up to 330 oC in order to ignite. Can you explain, using the physics we learned in class, why vegetation that contains more water does not ignite as easily as dry/dead vegetation? (2)
m
1. A river is 12.2 m wide with an average depth of 5.1 m. The river is flowing at a speed of 1.7
At one point in the river, there is a section of rapids. Here, the speed of the water increases to
a.
-3.6 . What is the effective area of the river at this point?
b. Later, the river dumps into a lake where the area rapidly increases to 202 m2. How fast is the water
moving just after it enters the lake?
River models are used to study many different types of flow situations (See, for example, the Video). A certain small river
has an average width and depth of 60 ft and 2 ft, respectively, and carries water at a flowrate of 550 ft3/s. A model is to be
designed based on Froude number similarity so that the discharge scale is 1/350. At what (a) depth and (b) flowrate would
the model operate?
(a) Im-
(b) Qm-
ft³/s
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