Tidal bores are a steep wall of seawater moving upstreams from their mouths when the tidal waves ent...........

Geography and Environment World - Water Bodies

Tidal bores are a steep wall of seawater moving upstreams from their mouths when the tidal waves enter the low-lying rivers. Which of the following conditions are conducive for the occurrence of a tidal bore?

1. Narrow and low-lying coastal river with gentle channel gradient.

2. A bay with a narrow opening and tapering head.

3. Small tidal range or wave height of a tide.

Select the correct answer using the code given below.

1 and 2 only

2 and 3 only

1 and 3 only

1, 2 and 3

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Explanation:

? Tidal bores: Tidal bores are steep wall of seawater moving upstreams from their mouths when the tidal waves enter the low-lying rivers.A tidal bore (bore=crest or wave) is a wall of water that moves up certain low-lying rivers due to an incoming tide. Because it is a wave created by the tides, it may be considered to be a true tidal wave”.
? Tidal bores are formed when tidal waves with great height i.e. high tidal range, enter a narrow and low-lying river, which debauches in the sea or bay, and rushes upstream and is obstructed by the flow of the river. Consequently, the tidewater is forced to have a steep wall-like crest. The following are conducive for the occurrence of tidal bore:
o Narrow and low-lying coastal river with gentle channel gradient.
o A bay with narrow opening and tapering head.
o Large tidal range (wave height), usually more than 5 meters.
o Upward decreasing water depth, meaning thereby decreasing depth of water in upriver section, etc. Hence, option (a) is the correct answer.