The Rio Grande River forms part of the national border between Mexico and the Un

Question

The Rio Grande River forms part of the national border between Mexico and the United States (Fig. A11.5.1). Notice that the position of the river changed in many places between 1936 (red line and leaders by lettered features) and 1992 (blue water bodies and leaders by lettered features). Study the meander terms provided in Figs. 11.13D and A11.5.1, and then proceed to the questions on the next page. Figure A11.5.1 THE RIO GRANDE (USA Mexico Border) 281 O (Pumping station) Rio Grande, 1992 Center of Rio Grande, 1936 USA MEANDER TERMS Oxbow lake Cutbank 1992 base map (USGS: Brownsville, TX) Red 1936 data from USGS map. 1000 2000 3000 4000 5000 Meters 2.0 MATAMOROS MEXICO 0 Miles

Explanation / Answer

A. Direction of a- downstream ESE

Direction of b- downstream ESE

Direction of c- downstream SSE

Direction of d- downstream ESE

Direction of e- downstream ESE

Direction of f- downstream SSE

B. Cutbanks on either side of the closed outer side of outer edges of a meander eroded through their banks and met together which gives the river a straighter path which cut off meanders from their water supply which led to formation of oxbow lakes.

C. The point J and K now in Mexico will be finally in USA. Each cutbank southwest of the meanders will erode and makes the river path straighter which isolate the meanders and create oxbow lakes again.

D. L, M and N are oxbow lakes. It indicates that the Rio Grande is shifting for many years.

E. Average rate of movement from A through G=507.1m

We know that rate=distance/time

Average rate=507.1/56=9.06m/yr

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