MORPHODYNAMIC SYSTEM AND THE EVOLUTION OF LAOLONGGOU TIDAL INLET
-
摘要: 老龙沟为典型沙坝-泻湖型潮汐汊道,潮汐汊道地貌结构完整。老龙沟口门处潮流动力最强,发育-20 m的深槽,口门内涨潮流三角洲上发育完整的多级水道体系。口门外落潮三角洲止于-11 m水深处,以突起的末端坝为地形标志,落潮主水道偏于落潮三角洲东侧发育,落潮三角洲西侧发育宽缓冲流平台。落潮主水道以落潮流为优势,冲流平台上潮流动力最弱,沉积物以粉砂质黏土为主。分割沙坝和末端坝上以砂质沉积为主,显示了波浪的二次分选作用。1945-2006年的地形对比显示波浪和潮流对老龙沟地貌演化的混合控制作用,偏东向波浪引起滨外沙坝和分割沙坝的迁移迫使落潮喷射流方向改变,引起了落潮水道的摆动,破波带内自东向西的沿岸泥沙流自老龙沟上游进入通道,部分堆积于口门内泻湖的潮间带,绝大部分泥沙堆积于老龙沟落潮三角洲。Abstract: Laolonggou is a typical tidal inlet as a part of the barrier-lagoon system of the north Bohai bay. The threshold of the inlet is 2.1 km wide and over 20m deep, and the maximum flood current or ebb current through the threshold may be over 1 m/s. A dendritic tidal drainage system is well developed on the flood delta with little sediment accumulation. According to the morphology of terminal shoal, the edge of the ebb tidal delta is located around -11 m of water depth. A main ebb tidal passage is developed on the east side of ebb tidal delta, in which ebb jet dominates. A swash platform with gentle slope is on the west side of the delta, on which the tidal dynamics is the weakest and the sediment the finest. On the shoal of terminal lobe and segmented sand bar, because of secondary sorting by breaking wave, silty sand and sand with shelly fraction deposited. The geomorphological evolution during 1945-2006 shows that both the tide and incident wave control the evolution of the morphological system of the Laolonggou tidal inlet. The main ebb passage swung westward due to the change of ebb jet under the influence of the movement of segmented sand bar and offshore barrier islands. The migration of the bar and islands was driven by the east and south incident wave. Most of sediment trapped at the tidal inlet is supplied by the longshore sand drift. Most of the sediment deposited on the ebb tidal delta, except part deposited on the intertidal flat around the Laolonggou lagoon.
-
Keywords:
- tidal inlet /
- flood tidal delta /
- ebb tidal delta /
- mixed energy
-
-
[1] 李从先,陈刚,王利. 滦河废弃三角洲和沙坝-泻湖沉积体系[J]. 沉积学报, 1983, 1(2):60-72. [LI Congxian, CHEN Gang, WANG Li. The abandoned Delta of the Luanhe river and the barrier-lagoon sedimentary systems[J]. Acta Sedimentologica Sinica, 1983, 1(2):60-72.]
[2] 张忍顺,李坤平. 滦河三角洲海岸潮汐汊道-潮盆体系的演变[J]. 海洋工程,1996, 14(4):45-52. [ZHANG Renshun, LI Kunping. Evolution of tidal inlet draining basin system on Luanhe river delta[J]. The Ocean Engineering, 1996, 14(4):45-52.]
[3] 张忍顺. 渤海湾淤泥质海岸潮汐汊道的发育过程[J]. 地理学报,1995, 11(6):506-513. [ZHANG Renshun. Development of tidal inlet in mud coast along Bohai bay[J]. Acta Geographica Sinica, 1995, 11(6):506-513.]
[4] Penland S, Suter J R, Boyd R. Barrier island arcs along abandoned Mississippi River Deltas[J]. Marine Geology, 1985, 63:197-233.
[5] 杨子赓,张志珣,王学言. 渤海湾北部浅海海洋地质环境演变与灾害地质问题[C]//刘光鼎从事地质工作50年科学研究会文集.北京:科学出版社, 1998:100-112.[YANG Zigeng, ZHANG Zhixun, WANG Xueyan. Geological environmental evolution and geological hazards in the offshore of northern Bohai Bay[C]//Symposium for felicitating Academician Liu Guangding working for 50 years. Beijing:Science Press, 1998 :100-112.]
[6] 河北海岛资源编纂委员会. 河北省海岛资源(下)[M]. 北京:海洋出版社,1995.[Compilation Committee of Hebei Island Resources. Hebei Island Resources Second Volume[M]. Beijing:China Ocean Press, 1995.] [7] 贾玉连. 曹妃甸砂坝-泻湖海岸现代沉积特征[D]. 南京大学硕士毕业论文,1998.[JIA Yulian. Modern sedimentary environment of barrier-lagoon system of Caofeidian[D]. Master thesis of Nanjing University,1998.] [8] Aubrey D G, Speer P E. A study of non-linear tidal propagation in shallow inlet/estuarine systems. Part I:Observations[J]. Estuarine, Coastal and Shelf Science, 1985, 21:185-205.
[9] Speer P E, Aubrey D G. A study of nonlinear tidal propagation in shallow inlet/estuarine systems. Part Ⅱ. Theory[J]. Estuarine, Coastal and Shelf Science, 1985, 21:207-224.
[10] 高抒. 潮汐汊道形态动力过程研究综述[J]. 地球科学进展,2008, 23(12):1237-1248. [GAO Shu. Morphodynamic processes of tidal inlets:a review[J]. Advances in Earth Science, 2008, 23(12):1237-1248.]
[11] 张乔明,郑德延,李绍宁,等. 湛江港潮汐汊道落潮三角洲沉积动力过程[J]. 地理学报, 1995,50(5):421-429. [ZHANG Qiaoming, ZHENG Deyan, LI Shaoning, et al. Sedimentary dynamic process of ebb delta of Zhan Jiang port[J]. Acta Geographica Sinica, 1995,50(5):421-429.]
[12] Price W A. Patterns of flow and channeling in tidal inlets[J]. Journal of sedimentary petrology, 1963, 33(2):279-290.
[13] 王强,袁桂邦,张熟,等. 渤海湾西岸贝壳堤堆积与海陆相互作用[J].第四纪研究, 2007, 27(5):775-786. [WANG Qiang, YUAN Guibang, ZHANG Shu, et al. Shelly ridge accumulation and sea-land interaction on the west coast of the Bohai bay[J]. Quaternary Science, 2007, 27(5):775-786.]
-
期刊类型引用(3)
1. SUN Tian-ting，HU Po，PAN Jun-ning，HOU Yi-jun，MO Dong-xue，WANG Deng-ting. Experimental Study on Scouring and Silting Deformation of Artificial Beach Under Storm Surge-Wave Coupling. China Ocean Engineering. 2022(01): 65-75 . 
必应学术
2. 蓝绍恺，易雪斐，李佳宸，郑权，史书婷，向佳. 波浪触发陆坡砂岩侵入复合体模拟装置研究. 石化技术. 2019(05): 115-116 . 百度学术
3. 岳帅，郑建国，杨亚迪，陶威，姚鑫，许国辉. 波浪对层状沙滩的塑形及粒径分配试验研究. 中国海洋大学学报(自然科学版). 2018(S2): 98-106 . 百度学术
其他类型引用(2)
计量
- 文章访问数: 1995
- HTML全文浏览量: 324
- PDF下载量: 22
- 被引次数: 5
下载:
