EARTH SCIENCE
LIMNOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The salinity of the estuary will decrease at high tide and increase at low tide.
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The salinity of the estuary will remain the same at a static point.
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The salinity of the estuary will increase at high tide and decrease at low tide.
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The salinity of the estuary will increase near the surface and decrease near the bottom.
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Detailed explanation-1: -The mixture of seawater and fresh water in estuaries is called brackish water and its salinity can range from 0.5 to 35 ppt.
Detailed explanation-2: -An estuary is a partially enclosed, coastal water body where freshwater from rivers and streams mixes with salt water from the ocean.
Detailed explanation-3: -Estuaries require a natural balance of freshwater and saltwater. Droughts reduce fresh water input into tidal rivers and bays, which raises salinity in estuaries, and enables salt water to mix farther upstream.
Detailed explanation-4: -As the tide rises, water from the ocean begins to surge into the mouth of a river, bringing with it higher levels of salt. This results in an increase in the salinity of the water in an estuary. Several hours later, at low tide, the ocean water recedes resulting in water with a lower salinity.