Changes in morphology of the Yellow River delta from 1979 to 2000
I was looking at the always-awesome Earth Observatory website from NASA and came across an interesting comparison of images of a river delta over time.
The first image below is the Huange He delta in 2000.
The comparison image below is from 1979.
Here’s the blurb from the EarthObservatory site:
Compared to the earlier image, the 2000 shot shows an increase in developed land and a slight decrease in vegetation. The most striking difference between the two images, however, is the shape of the coastline. A steady supply of sediment expanded the Yellow River delta until it pushed into Bo Hai like a giant hook. Sediment colored the coastal waters bright blue. This delta-building process has added several hundred square kilometers of land to China’s coast.
I wonder if the change from a “smoother” coastline to the more “birdsfoot” river-dominated morphology has mostly to do with the land use changes? That is, a more restricted river course would preclude frequent avulsions and construction of the distributive dispersal pattern. A more restricted river course would result in more spatially focused growth. I don’t know … just thinking out loud.
In case you are wondering where this delta is along the China coast, here is a regional GoogleEarth image.
There’s a similar comparison from the same time periods of aquaculture development along the shores of Bo Hai Bay