Geomorphic change in Dingzi Bay, East China since the 1950s: impacts of human activity and fluvial input
Geomorphic change in Dingzi Bay, East China since the 1950s: impacts of human activity and fluvial input
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20世纪50年代以来华东丁子湾地貌变化：人类活动和河流输入的影响
DOI：
10.1007/s11707-016-0586-z
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发表时间：
2017-06-01
影响因子：
2
通讯作者：
Liu, Yalong
中科院分区：
文献类型：
--
作者：
Tian, Qing;Wang, Qing;Liu, Yalong
本文研究了自20世纪50年代以来，中国东部丁子湾地貌对人类活动和河流输入变化的响应。该分析基于多种数学方法的数据，以及从遥感、地理信息系统和全球定位系统技术获得的信息。结果表明：丁子湾年径流量和输沙量总体呈显著下降趋势，1966年和1980年呈明显下降趋势；约60%-80%的下降是由于乌龙河流域降水减少。自20世纪50年代以来，丁子湾地貌类型发生了显著变化，特别是1981 - 1995年。大面积滩涂、沼泽、盐田、水田复垦，建设水产养殖场。因此，海湾的侵蚀和沉积模式发生了实质性的变化。1966年以后，虽然泥沙输入减少了65.68%，但海湾的泥沙沉积率仍然很低。然而，由于海湾的大规模开发，1981年后沉积速率发生了显著变化，净沉积面积约为1961-1981年的10倍。1995年后，随着大规模人类活动的结束，这种地貌演化趋于稳定。从总体上看，1952—2010年，定子湾呈淤积趋势，湾头向海方向迁移，潮溪系统通道数量减少，潮口变窄变短。综上所述，自20世纪50年代以来，丁子湾的大规模开发和人类活动控制了丁子湾的地貌演变。
This study examines the geomorphic evolution of Dingzi Bay, East China in response to human activity and variations in fluvial input since the 1950s. The analysis is based on data from multiple mathematical methods, along with information obtained from Remote Sensing, Geographic Information System and Global Position System technology. The results show that the annual runoff and sediment load discharged into Dingzi Bay display significant decreasing trends overall, and marked downward steps were observed in 1966 and 1980. Around 60%–80% of the decline is attributed to decreasing precipitation in the Wulong River Basin. The landform types in Dingzi Bay have changed significantly since the 1950s, especially over the period between 1981 and 1995. Large areas of tidal flats, swamp, salt fields, and paddy fields have been reclaimed, and aquaculture ponds have been constructed. Consequently, the patterns of erosion and deposition in the bay have changed substantially. Despite a reduction in sediment input of 65.68% after 1966, low rates of sediment deposition continued in the bay. However, deposition rates changed significantly after 1981 owing to large-scale development in the bay, with a net depositional area approximately 10 times larger than that during 1961–1981. This geomorphic evolution stabilized following the termination of large-scale human activity in the bay after 1995. Overall, Dingzi Bay has shown a tendency towards silting-up during 1952–2010, with the bay head migrating seaward, the number of channels in the tidal creek system decreasing, and the tidal inlet becoming narrower and shorter. In conclusion, large-scale development and human activity in Dingzi Bay have controlled the geomorphic evolution of the bay since the 1950s.