%0 Journal Article
%T Impacts of the large amount of sand mining on riverbed morphology and tidal dynamics in lower reaches and delta of the Dongjiang River<br>大量采沙对东江下游及东江三角洲河床地形和潮汐动力的影响
%A JIA Liangwen
%A LUO Zhangren
%A YANG Qingshu
%A OU Shuying
%A LEI Yaping
%A <br>贾良文
%A 罗章仁
%A 杨清书
%A 欧素英
%A 雷亚平
%J 地理学报(英文版)
%D 2007
%I 
%X The sand dredging and its impacts on riverbed evolution and tidal dynamic change in the lower reaches and delta of the Dongjiang River are examined in this paper. The large amount of sand, totally 3.32 billion m3 from 1980 to 2002, was mined from the riverbeds of the lower reaches and delta of the Dongjiang River. Increasing of the channel capacity, lowering of the average riverbed elevation, deepening of the water depth and decreasing of the longi- tudinal riverbed gradient are the main effects on the riverbed evolution brought by the large amount of sand dredging. Under the strong sand dredging and associated significant riverbed deformation, the notable changes of the tidal dynamic in the lower reaches and delta of the Dongjiang River occurred, including: (1) in the upper reaches of the Dongjiang River delta and lower reaches of the Dongjiang River, tidal level dropped apparently, tidal range widened, flood tidal duration became longer, amplitudes for major tidal components became bigger and tidal dynamics intensified; (2) tidal wave spread faster; and (3) the limits of the tidal level, tidal current and salt water moved upstream.
%K Dongjiang River
%K sand mining
%K tide<br>东江下游
%K 东江三角洲
%K 大量采沙
%K 河床形态
%K 潮汐动态
%K 珠江水系
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=869B153A4C6B5B85&jid=E7E6A89DD0CE36AA3756C02EB6F15CA7&aid=D25C239EB8EED0050DBC10451FCFDCDD&yid=A732AF04DDA03BB3&vid=BCA2697F357F2001&iid=0B39A22176CE99FB&sid=2BA123C6EB9D54C2&eid=CC0ECB9C52F1B85F&journal_id=1009-637X&journal_name=地理学报(英文版)&referenced_num=0&reference_num=16