Give two examples on how humans can affect the natural formation of deltas and sand dunes

Mississippi Bird foot delta in US,  Nile delta in Egypt are some examples.

Explanation:

The human can also impact the natural formation of deltas, but for this one must understand that delta is landform created by the deposition of sediments brought by the river which flows in and out and leaves the suspended particles as it slowly moves with stagnant water.  

Deltas are fan-like and typically found in the dry atmosphere as a result of the growth of the population man is continuously degrading the quality of rivers.  

By addition, various pollutants in the river through the streams, and river load carrying capacity is decreasing so much as it's now unable to deposit the sediments that it earlier used to carry as silt sewage have are clogging the mouth, impacting biodiversity severely  

Various studies show a significant amount of landform transformation has occurred due to the impact of man on deltas and dunes shifts have occurred as a result of human migration and trade of sand across borders.