River delta slope offshore, waves will make river deltas smoother. Waves can also be responsible for carrying sediments away from the river delta, causing the delta to retreat. For deltas that form further upriver in an estuary, there are complex yet quantifiable linkages between winds, tides, river discharge, and delta water levels. Erosion is also an important control in tide-dominated deltas, such as the Ganges Delta, which may be mainly submarine, with prominent sandbars and ridges. This tends to produce a "dendritic" structure. Tidal deltas behave differently from a river- and wave-dominated deltas, which tend to have a few main distributaries. Once
Pearl River Delta producing low margin and commodity goods have increased. This is on top of the rising cost for energy, food, transport and the appreciation of the Renminbi against the falling US Dollar. Some manufacturers will need to cut costs by moving up the value chain or moving to more undeveloped regions. The industrial cities in the Pearl River Delta has been called the "Factory of the World" or the "World's Factory" due the presence of industrial parks populated with factories from foreign investments. The target market of the delta region's exports, however, has become increasingly domestic rather than foreign. The Pearl