基于"动力组分"思想的沉积物粒径趋势模型

刘涛; 石学法; 刘莹

基于"动力组分"思想的沉积物粒径趋势模型

1.
中国科学院海洋研究所海洋地质与环境重点实验室,山东青岛 266071;国家海洋局第一海洋研究所,山东青岛266061
2.
国家海洋局第一海洋研究所,山东青岛266061
3.
同济大学土木工程学院,上海 200092

基金项目: 我国近海海洋综合调查与评价专项(908-1-CJ09)。

计量
- 文章访问数: 1452
- HTML全文浏览量: 19
- PDF下载量: 1310
- 被引次数: 0
出版历程
- 收稿日期: 2010-10-25

A grain size trend modal based on the concept of "dynamic populations"

1.
Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
College of Civil Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: "粒径趋势分析"的基本思想是利用沉积物粒度参数的空间变化(粒径趋势)来反推沉积物输运路径。依据"动力组分"思想,通过建立一个一维的悬浮沉积物输运模型来正演沉积物输运方向上的表层沉积物粒度分布和粒径趋势,探讨水动力能量沿程衰减和沿程增强两种不同情形下的粒径趋势特征。研究表明:粒径趋势形成的直接原因是沉积物中不同"动力组分"的混合比在净输运方向上的一定距离内单调变化。在沉积物净输运方向上,当水动力能量沿程衰减时可以先后出现两种粒径趋势类型,水动力能量沿程增强时最多可先后出现三种粒径趋势类型。水动力能量的沿程变化速度对于粒径趋势的转换有重要影响,变化速度越快,则粒径趋势类型完成转换时的距离越短。和分选系数相比,峰度值有着相同的变化趋势且对混合比的变化更为敏感。
- 粒径趋势 /
- 动力组分 /
- 沉积物输运模型
Abstract: As a method of inferring net sediment transport pathway from spatial distribution of grain size parameters, the grain size trends analysis (GSTA) has been employed widely in cases of marine geology studies. In this paper, based on the concept of "dynamic populations", a one dimension suspended sediment transport modal has been established to deduce the formation of grain size trend in the net sediment transport direction. The result show that:if the hydrodynamic energy level decreasing along sediment transporting direction, two kinds of grain size trend can form successively in the transporting direction; whereas, if the hydrodynamic energy increasing along sediment transport direction, three kinds of grain size trend can form successively at most. The speed of hydraulic dynamic energy enhancing/attenuation can obviously change the GST distribution along transporting path, Higher speed can enable the GST transform complete in shorter distance. The value of kurtosis has the same variation trend as Std and can be more sensitive to mixing ratio changing, therefore, better result can be gained if we replace the Std with kurtosis in GSTA.
- grain size trend /
- dynamic population /
- sediment transporting modal

HTML全文

参考文献(21)

MCCAVE I N.Grain size trends and and transport along beaches:Example from eastern England[J].Marine Geology,1978,28:43-51.

KNIGHTON A D.Longitudinal changes in size and sorting of stream bed material in four English rivers [J].Bulletin of the Geological Society of America,1980,14:691-701.

NORDSTORM K F.Down-drift coarsening of beach foreshore sediments at tidal inlets:An example from the coast of New Jersey[J].Earth Surface Processes and Landforms,1989,14:482-520.

MCLAREN P.An interpretation of trends in grain size measurements[J].Journal of Sediment Petrology,1981,51:611-524.

GAO S, COLLINS M.Net sediment transport patterns inferred from grain-size trends, based upon definition of "transport vectors"[J].Sedimentary Geology,1992,80:47-60.

程鹏,高抒.北黄海西部海底沉积物的粒度特征和净输运趋势[J].海洋与湖沼,2000,31(6):604-615.

LE Roux J P, O'BRAIN R D, RIOS F ,et al. Analysis of sediment transport paths using grain-size parameters[J]. Computers & Geosciences,2002.28(5):717-721.

WU J, SHEN H. Estuarine bottom sediment transport based on "McLaren Model": a case study of Huangmaohai Estuary, South China[J]. Estuarine,Coastal and Shelf Science,1999,49:265-279.

VAN Wesenbeck V, LANCKNEUS J. Residual sediment transport paths on a tidal sand bank: A comparison between the modified McLaren model and bed form analysis[J].Journal of Sedimentary Research,2000,70(3):470-477.

GAO S, COLLINS M. The use of grain size trends in marine sediment dynamics: a review[J].Chinese Journal of Oceanology and Limnology,2001,19(3):265-271.

WELTJE G J,PRINS M A.Genetically meaningful decomposition of grain-size distributions[J]. Sedimentary Geology,202(2007):409-424.

JAN-BEREND W STUUTE. 300-kyr record of aridity and wind strength in southwestern Africa: inferences from grain-size distributions of sediments on Walvis Ridge, SE Atlantic[J]. Marine Geology,2002,180:221-233.

PRINS M A, POSTMA G, WELTJE G J. Controls on terrigenous sediment supply to the Arabian Sea during the late Quaternary: the Makran continental slope[J].Marine Geology,2000(169):351-371.

张晓东,翟世奎,许淑梅.端元分析模型在长江口邻近海域沉积物粒度数据反演方面的应用[J].海洋学报,2006,28(4):159-166.

MORENO A. Saharan Dust transport and high-atitude glacial climatic variability:The Alboran Sea record[J]. Quaternary Research,2002,58:318-328.

WELTJE G J, PRINS M A. Muddled or mixed? Inferring palaeo-climate from size distributions of deep-sea clastics[J]. Sedimentary Geology,2003(162):39-62.

ANDREW L Moore, BRIAN G McAdoo, ALAN Ruffman. Landward fining from multiple sources in a sand sheet deposited by the 1929 Grand Banks tsunami, Newfoundland[J].Sedimentary Geology,2007(200):336-346.

李占海,高抒,沈焕庭等.江苏大丰潮滩悬沙级配特征及其动力响应[J].海洋学报,2006,28(4):87-94.

MCMANUS J.Grain size determination and inter pretation.Techniques in sedimentology .Back well Oxford,1988:63-85.

CAMENNEN B.Simple and general formula for the settling velocity of particles[J].Journal of Hydraulic Engineering,2007, 133(2):229-223.

MCLAREN P, BOWLES D.The effects of sediment transportation on grain-size distrbutions[J].Iournal of Sediment Petrowgy,1985,55(4):57-470.

施引文献

资源附件(0)

访问统计