山东半岛月湖潮汐汊道沉积物输运与堆积

IOCAS-IR > 海洋环流与波动重点实验室

	山东半岛月湖潮汐汊道沉积物输运与堆积
	薛允传
学位类型	博士
	2000
学位授予单位	中国科学院海洋研究所
学位授予地点	中国科学院海洋研究所
学位专业	海洋地质学
关键词	月湖潮汐汊道潮汐泥沙输运沉积速率环境变化
摘要	月湖，又称天鹅湖，位于山东半岛最东端荣成湾顶的西南侧。面积约4.94 Km~2，西、北、南侧为陆地所包围，东部由荣成湾沙坝与外海隔开，东南部有一132m宽的潮流通道与外海相通，它由涨潮三角洲、落潮三角洲、纳潮盆地和潮汐通道四部分组成，是一个典型的潮汐汊道系统。1998年11～12月和1999年8～9月两次对月湖的沉积物特征，水动力条件，地貌特征做了广泛、深入的调查研。研究结果表明：月湖水深比较浅，大部分地区在1到1.5 m之间；底质呈环状分布，从湖边缘到中心依次为：砾质砂、泥质砂、砂质泥和泥，湖中心柱状样由粉砂或粘质粉砂组成，平均含水量为54.67％，平均有机碳含量为2.7％，测得沉积速率为1.49cm a~(-1)，沉积通量为1.04 g cm~(-2) a~(-1)有机碳通量为0.028 g cm~(-2) a~(-1)；月湖潮汐为不正规半日潮，日不等现象显著，口门主水道涨潮历时短，流速小，落潮历时长，流速大；口门主水道泥沙向外海搬输运，悬移质输运量比底移质输运量小近两个数量级；湖内沉积物粒径趋势分析表明沉积物由四周向湖心搬运。在过去的二十年里，由于人类对月湖的不合理开发和利用（在口门修建蓄水闸，虾池悬垦），造成泥沙大量淤积，使生态系统稳剧退化。如果不采取有效措施，月湖很快就会消失。
其他摘要	Yuehu, known also as Swan Lake, lies in the southwestern part of Rongcheng By, eastern Shandong Peninsula. It covers an area of 4.94 km~2. It is encircled by land in the west, north and south, and is separated from Rongcheng Bay by a sand spit in the east. In the southwest there is an entrance channel, 132m wide, which connects the tidal basin with the open sea. The Yuehu tidal inlet system consists of an ebb delta, a flood delta, a tidal basin and a tidal channel at the entrance to the basin; it is a typical tidal inlet on sandy coast. We investigated the sediment characteristics, hydrodynamic conditions and geomorphological features of Yuehu extensively, from November to December, 1998 and from August to September, 1999. The results show that Yuehu is very shallow, with water depths of 0.5 to 1.5 m over most parts. The surficial sediment has a distinct distribution pattern: from the edge to the central part of the basin, sediment becomes progressively finer, from gravelly-sand through muddy-sand and sandy-mud, to mud. A short core collected from the central part of Yuehu is composed of silt and clayeysilt; it is associated with an averaged water content of around 54.67%, an averaged organic carbon content of around 2.7%, a deposition rate measured by ~(210)Pb dating method of 1.49 cm a~(-1), a vertical sediment flux of 1.04 g cm~(-2) a~(-1) and an organic carbon flux of 0.028 g cm~(-2) a~(-1). The tide in the Yuehu is irregularly semidiurnal in character. The flood duration is shorter than the ebb duration, but the flood current velocity is smaller than the ebb current in the central part of the entrance channel. Here, sediment transport is directed to seaward, and the material in transition is dominated by bedload. Within the tidal basin, grain size trend analysis indicates that the sediments are transported towards the center of Yuehu. For the past 20 years, because of inappropriate utilization of the inlet system by the local people, siltation in Yuehu has been accelerated and the ecosystem has been deteriorating rapidly. If no effective measures are taken to improve its water circulation pattern and ecosystem, Yuehu will be closed soon.
页数	101
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/241
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	薛允传. 山东半岛月湖潮汐汊道沉积物输运与堆积[D]. 中国科学院海洋研究所. 中国科学院海洋研究所,2000.

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