Recent geomorphic change in LingDing Bay, China, in response to economic and urban growth on the Pearl River Delta, Southern China
Recent geomorphic change in LingDing Bay, China, in response to economic and urban growth on the Pearl River Delta, Southern China
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DOI：
10.1016/j.gloplacha.2014.10.009
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发表时间：
2014-12
影响因子：
3.9
通讯作者：
Ziyin Wu;J. Milliman;Zhao Dineng;Zhou Jieqiong;Cai Yao
中科院分区：
文献类型：
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作者：
Ziyin Wu;J. Milliman;Zhao Dineng;Zhou Jieqiong;Cai Yao
河流水量和沉积物排放量减少、土地开垦增加、气候变化和海平面上升对河流三角洲，特别是与东南亚接壤的三角洲产生了越来越大的影响。利用100年的导航和测深数据，加上超过50年的河流流量数据，我们在这里记录的人类活动对珠江三角洲及其河口伶仃湾，中国，该网站最近的快速经济扩张和城市化。1906年至1988年，约80平方公里，约1平方公里/年，从海湾开垦的土地，几乎完全用于农业。在随后的20年里，1988-2008年，近200平方公里的土地被开垦（10平方公里/年），主要用于制造和航运设施;甚至一些以前开垦的农业用地也被转化为工业用途。大部分的填海土地来自于相应的潮间带和浅水深度的损失：1988年至2008年，潮上和潮下滩（水深-2至5米）的面积减少了约180平方公里。相比之下，为容纳更大的船只而进行的航道疏浚使水深超过10米的区域增加了约36平方公里。虽然自1906年以来北方海湾的水量减少了20%，但海湾面积的减少导致海湾整体加深了15%。随着珠江三角洲经济的持续扩张，伶仃湾的面积和水量将继续缩小，但海湾将继续加深。
Decreased fluvial water and sediment discharge, increasing land reclamation, changing climate, and rising sea level have had an ever-increasing impact on river deltas, particularly those deltas bordering Southeast Asia. Utilizing 100 years of navigational and bathymetric data, together with more than 50 years of fluvial discharge data, we here document the impact of human activities on the Pearl River Delta and its estuary at LingDing Bay, China, the site of recent rapid economic expansion and urbanization. Between 1906 and 1988, approximately 80 km2, ~ 1 km2/yr, of land was reclaimed from the Bay, almost entirely for agriculture. During the ensuing 20 years, 1988–2008, nearly 200 km2of land was reclaimed (10 km2/yr), mostly to be used for manufacturing and shipping facilities; even some of the previously reclaimed agricultural land was converted to industrial use. Most of the reclaimed land came from a corresponding loss of intertidal and shallow depths: between 1988 and 2008, the area occupied by supratidal and subtidal flats (− 2 to 5 m water depths) declined by ~ 180 km2. Channel dredging to accommodate ever larger ships, in contrast, increased areas with depths greater than 10 m by about 36 km2. Although water volume in the northern bay has decreased by 20% since 1906, decreasing bay area has resulted an overall 15% deepening of the bay. With continued economic expansion in the Pearl River Delta, LingDing Bay should continue to shrink in both area and water volume, although the bay should continue to deepen.