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| 1 | Effects of the Anthropogenic Activities on the Morphological Evolution of the Modaomen Estuary, Pearl River Delta, China显示文摘Owing to the intensive human activities,the Modaomen Estuary has been significantly modified since 1950s,which has resulted in considerable changes of hydrodynamics and morphodynamics in the area.In this paper,the effects of the anthropogenic activities on the hydrodynamics and morphological evolution in the estuary at different stages are systematically assessed based on the detailed bathymetric data and field survey.The results show that the human activities have caused the channelization of the enclosed sea area in the Modamen Estuary;fast seaward movement of the mouth bar with high siltation;expansion of the channel volume due to channel deepening.The paper also highlights the main hydrodynamic changes in the estuary,including the rise of the water level;the distinguishing changes of tidal range before and after the 1990s(decrease and increase respectively);as well as the increase of the divided flow ratio.It is found that reclamation is the main factor promoting the transition of nature of the estuary from runoff dominant to runoff and wave dominant,and sand mining activities are mainly to strengthen the tidal dynamic and to low the water level.The results provide useful guidance for better planning of the future developments in the estuary and further research in the area. | 贾良文 潘顺琪 吴超羽 | 2013 | China Ocean Engineering2013,27,6: | 3 |
| 2 | 宏图:珠江三角洲景观动态解析显示文摘聚焦珠江三角洲地区的景观动态演变,重点介绍影响该区域在未来变化中的一些关键问题和驱动因素。三角洲的景观形成以自然动态和过程演替为特征,而土壤沉积是形成其景观格局的关键性因素。人类的活动极大程度地改变了珠江三角洲的景观格局。数百年前,大规模的原生林被急剧砍伐,致使其遭受了严重的水土流失和泥沙沉积,直至20世纪末实施“植树造林”计划,毁林导致生态恶化的情形才有所缓解。在低洼的冲积平原,农业和水产养殖业则在很大程度上依赖于对堤防系统和地下水位的管理。珠江三角洲具有得天独厚的基塘农业系统,但伴随着高强度的城市化进程,其蚕桑生产逐渐萎缩,而高度集约化的现代水产养殖正在这些区域蔓延。近几十年来,珠三角都市群已拥有1.2亿居民。伴随着人口膨胀,采砂和疏浚常被用来满足日益增长的基建需求,水坝和水库的建设也大量减少了珠江所携带的泥沙沉积,这些因素都致使珠三角的沉积物呈负平衡的状态。与此同时,湿地资源也面临着巨大的考验,诸多问题如土壤侵蚀与采砂工程,进一步加大对滨海和河口湿地的负面影响。上述这些互相牵制且高度复杂的环境问题,亟须通过多尺度、跨学科协作的方法进行研究并寻求解决方法,进而为实现更加可持续的环境管理提供科学的依据。 | 埃卡特·兰格 陆熹(译) | 2019 | 风景园林2019,26,9: | 2 |
| 3 | 近50年东江三角洲潮汐运动的变化研究显示文摘基于东江三角洲的5个水文观测站和东江下游的博罗流量观测站数据,分析近50 a来东江三角洲潮汐运动特征的变化。水文统计学方法表明上游石龙站点的水位和潮差变化程度远大于下游的大盛和泗盛围站点,且石龙站点低低潮曾发生于小潮,后发生于大潮时期,这一变化与潮汐分潮振幅变化相关。T_Tide调和分析得出的分潮振幅结果显示,各站点的振幅变化与水位和潮差变化相关,尤其石龙站点的半月分潮和半日分潮大小的转换能够说明低低潮发生时间的变化。此外计算出的地形指标变化,表明石龙站点因人类活动所导致的河床下切所引起的潮动力变化,对以上变化起到不同程度的影响作用。 | 秦震 程梁秋 秦莉真 方拥军 | 2018 | 水道港口2018,39,6: | 1 |
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