天津市潮间带表层沉积物的类型及其分布
The surface sediment types and distribution of Tianjin intertidal zone, China
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摘要: 根据在天津市潮间带地区采集的108个底质样品的粒度分析结果，划分了潮间带表层沉积物的类型，并探讨了潮间带的粒度分布特征和沉积作用。结果表明，天津潮间带可分为3个岩性区，分别以海河口、独流减河口为界，海河口以北至涧河口为片状粘土质粉砂分布区，海河口以南至独流减河口为多岩性、条带状的砂-粉砂分布区，独流减河口至歧口为片状粘土质粉砂分布区。海河口以北的潮间带是以低能潮汐作用为主的泥质粉砂潮滩沉积环境，海河口以南的潮间带是以河口沉积为主体，后经潮汐改造的潮滩环境，驴驹河-独流减河河口岸段潮间带早期水动力较强，后受到潮滩环境的改造，歧口岸段潮间带以潮滩沉积环境为主。Abstract: Based on the grainsize analysis results of 108 surface samples taken from the intertidal zone of Tianjin area, the authors divided the types of the sediment, and discussed the distributed characters of granularity and the sedimentary process of the intertidal zone. Three lithology zones were got on the intertidal zone of Tianjin area with the boundary of Haihe River and Duliujianhe river mouths. From the north of Haihe river mouth to the Jianhe river mouth is clayey-silt area. Sandy-silt area with mixed lithology distributes between the south of Haihe river mouth and the Duliujianhe river mouth. From the Duliujianhe river mouth to the Qikou is also the clayey-silt intertidal zone. The sedimentary dynamics of the intertidal zone is different. The intertidal zone on the north of Haihe river mouth is a tidal dominate environment, but on the south is a river dominate environment with tide transformation. The water energy on the intertidal zone from Lvjuhe to Duliujianhe river mouth was strong in the early periods, but was also influenced by tide transformation later. The intertidal zone on Qikou area is a tidal dominate environment.
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Keywords:
- Tianjin City /
- intertidal zone /
- sediment types /
- distribution
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