These questions refer to the Rio Grande map, Figure 11.11. These questions refer
ID: 291609 • Letter: T
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These questions refer to the Rio Grande map, Figure 11.11. These questions refer to the Rio Grande map, Figure 11.1. 4. Study Locations H and I a. In what country were H and I located in 1936? (2 points) lool b. In what country were H and I locatied in 19927 (2 points) Explain a process that probably caused locations H and I to change from meanders to oxbow lakes. (6 points) 5. Based and K. (5 points) on your answer to 4c, predict how the river will change in the future at locations J 6. What are features L, M, and N, and what do they indicate about the historical path of the Rio Grande? (5 points) 7. What is the average rate at which meanders like A through G migrated here (in meters per year) from 1936 to 19922 Explain your reasoning and calculations. SHOW WORK for full credit. (5 points) 8. Explain in steps how a meander evolves from the earliest stage of its history as a broad slightly-sinuous meander to the stage when and oxbow lake forms.(5 points)Explanation / Answer
4a) In 1936 both H & i points were in Mexico.
b) In 1992 both H & i points were in USA.
c) River water due to high energy & less friction and low energy & high fiction in the water at both the banks erodes one side & deposite sediments on other side, as water moves laterally which forms large bends or we can say horseshoe-like loops called meanders. But over the time horseshoe become tighter, until the ends become very close together and the ends join, the loop is cut-off from the main channel. The cut-off loop is called an oxbow lake.
5) The river at points J & K is like tight horseshoe. Very soon the ends will become very close & ultimately will join together forming 2 oxbow lakes at J & K positions.
6) Points L, M & N is now seen as oxbow lakes which means that at some time ago the path of the river was along these oxbow lakes. At that time these lakes were big meanders which ulimately got cut from the channel and now known as onbow lakes.
7) At point A: migration is around 600m
Rate of migration = 600/ (1992-1936) = 600/56 = 10.714 m/year
At point G: migration is around 500m
Rate of migration = 500/ (1992-1936) = 500/56 = 8.928 m/year
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