港湾淤泥质潮滩的周期变化
-
摘要: 浙江三门湾为典型半封闭强潮港湾,淤泥质潮滩十分发育,存在沉积地貌相带分异。潮滩发育过程中,冲刷和淤积状态交替,形成涨落潮周期、大小潮周期、年周期、多年周期和风暴的“潮滩循环”,与动力环境因素的周期变化相关;台风引起剧烈滩槽交换,是其重要的非潮汐因素。由于毗邻潮汐汊道,湾内宽广蓄潮区导致强劲落潮优势流,自然状态下潮滩及潮下带淤积缓慢。据210Pb和137Cs分析,近百年来长期平均沉积速率为0.56~0.81cm/a.但自60年代以来,湾内大量围涂堵港,导致潮下带浅滩与深槽淤积加快。
-
任美得等.江苏王港地区淤泥质潮滩的沉积作用.海洋通报,1984, 3(1):40-51 李炎等.浙江象山大目涂淤泥质潮滩发育的周期性.海洋学报,1987, 9(6):725-734 成国栋主编.黄河三角洲现代沉积作用及模式.北京:地质出版社.1991, 110 陈吉余等主编.长江河口动力过程和地貌演变.上海:上海科学技术出版社,1988 李炎,谢钦春.杭州湾庵东浅滩地貌演变规律.东海海洋,1993, 11(2):2 5 33 中国海湾志编纂委员会.中国海湾志(上海市和浙江省北部海湾),第五分册.北京:海洋出版社,1992 Goldberg E. Radioactive dating, International Atomic Energy Agency. Vienna, 1963, 121-131 Nittrouer C A, R W Sternberg and R Carpenter. The use of Pb-210 geochronology as a sedimentological tool:application to the Washington Continental Shelf. Marine Geology, 1979, 31, 297-316 Demaster D J, B A Mckee, C A Nittrouer and J Qian. Rates of sediment accumulation and particle reworking based on radiochemical measurements from continental shelf deposits in the East China Sea. Cont. Shelf Res.,1985,4,143-158 谢钦春,李伯根,夏小明等.浙江匝江口南岸潮滩相带的时空变化.地理学报,1994, 49(6):509-516 Robbins J A. Determination of recent sedimentation rates in Lake Michigan using Pb-210 and Cs-137. Geochom. Cos- mochim. Acta, 1975, 39, 285-304 Krishnaswami Lal D et al. Geochronology of lake sediments, Earth Planet. Sci. Lett.,1971,11,407-414 Milan C S et al. Assessment of the Cs-137 method for estimating sediment accumulation rates:Louisiana salt marshes. J. of Coastal Research, 1995. 11. 296-307 李培泉等.东海及邻近大洋海水中137Cs含t的测定.海洋科学集刊,第21集,北京:科学出版社,1984, 265-268 夏小明,谢钦春.三门湾内细顺粒泥沙的沉积作用.三门湾综合开发论文集,北京:海洋出版社,1992. 99-106 Postma H. Transport and accumulation of suspended matter in the Dutch Wadden Sea, Neth. J. Sea Res.,1961,1(1-2):148-190 O'Brien M P. Estuary tidal prism related to entrance areas. Civil Engr.,1931,1(8):738-739 高抒.东海沿岸潮汐汉道的P-A关系.海洋科学,1988, (1): 15-19 夏小明,谢钦春.浙江三门湾海岸发育与持续利用.海洋通报,1996, 15(4):49-57
点击查看大图
计量
- 文章访问数: 788
- HTML全文浏览量: 5
- PDF下载量: 839
- 被引次数: 0