Sediment discharge from the Yangtze into the sea has decreased rapidly from 481.7 × 106 tons/y (1953–76) to 389.5 × 106 tons/y (1977–2000), without any corresponding decrease in water discharge. In 2001, the sediment discharge from the Yangtze dropped to 276 × 106 tons. Human activities and climate changes obviously play a major role for reducing the sediment supply from the upper basin and for increasing the sediment sinks in the mid–lower basin. Sediment budgets in different parts of the Yangtze are estimated according to hydrometric data and other sources. Major physical and anthropogenic processes are examined with respect to their effects on sediment discharge from the Yangtze into the sea. The decrease of sediment supply (−46.8 × 106 tons/y) from the upper Yangtze in the second period accounts for about 50% of the total decrease (−92.2 × 106 tons/y) into the sea, mostly due to the increased sedimentation in reservoirs as well as climatic factors. The other 50% decrease is mostly attributed to increased sand mining in the mid–lower Yangtze and the decreased sediment supply from the Hanjiang River after building the Danjiangkou Reservoir.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 2005 • No. 213