โ Scribed by Walker, H. Jesse
No coin nor oath required. For personal study only.
Marine deltas are among the most dynamic and recent of the Earth's landforms to develop. They also are among the most densely populated and intensively utilized environments on Earth. In addition, they are subject to significant changes due to natural and human activities. Thus, it is not surprising that, today, they are of major concern to both natural and social scientists, engineers and those involved in coastal management.
During the last glacial maximum, when sea level was c.120 m below the level of today, the lower courses of river valleys were entrenched. As sea level rose, sea water penetrated the lower courses of rivers resulting in deposition of river-borne sediments. Eventually, and especially since sea level reached a general still-stand position approximately 4000 to 7000 years ago, many of those valleys filled and deltas formed. Although some of the valleys are still in the filling stage, others, such as the major deltas of the Ganges-Brahmaputra, Lena, Mississippi, Nile and Po, have penetrated into a bordering sea.
The Balize Delta, which began to form about 600-800 years ago, is the most recent extension of the Mississippi River into the Gulf of Mexico. River discharge is evidenced by the turbid plume that is present in the Gulf south of the delta. Image provided courtesy Harry Roberts
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