Exact(3)
People have altered the connectivity of river systems in diverse ways for hundreds of years, with the net effect of reducing river connectivity by impeding longitudinal (e.g., dams), lateral (e.g., levees), and vertical fluxes (e.g., channelization) within river networks.
It was apparent that the current decreasing trend in sediment yield in the Jialing River was due to the effects of revegetation, soil conservation and water conservancy efforts on reducing river sediment.
At the same time, a sand and gravel sediment wave dispersed down the river channel, filling channel pools and floodplain channels, aggrading much of the river channel by ~ 1 m, reducing river channel sediment grain sizes by ~ 16-fold, and depositing ~ 2.2 million m3 of sand and gravel on the seafloor offshore of the river mouth.
Similar(5)
A greatly reduced river would wreak chaos in seven states: Colorado, Utah, Wyoming, New Mexico, Arizona, Nevada and California.
Since 1957 the highway connecting San Fernando de Apure with Calabozo and the densely populated north has reduced river traffic drastically.
It is designed with baffles that reduce river current inside the upward-sloping tunnel so alewives can swim through it into the river pond.
The report cited success stories in Bangladesh, Botswana, Chile, China, India, Poland, South Korea, Uganda and Vietnam, and it claimed specific achievements like helping reduce river blindness in West Africa and iodine deficiencies in China.
The lowering that took place between 1929 and 1977 was attributed to climatic changes that increased evaporation and reduced river influx amplified by reservoir construction on the Volga to supply river water for irrigation and industry.
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