摘要
为研究多因子共同作用下的潮滩演变机制,开发了基于植被生长和潮动力作用的潮滩剖面演变数学模型。在不考虑植被作用下,模拟得到了潮滩中长期演变后的上凸形剖面特征;泥沙供给是决定潮滩宽度的因素,供给越充分,潮滩宽度越大。模型考虑植被过程时,结果表明不同的植被生物量分布形式对潮滩水动力的影响程度不同,在潮间带上部,生物量抛物线分布时的减流效果强于生物量线性分布形式;而在潮间带下部则相反。模拟结果显示盐沼和光滩之间出现陡坎,且随着滩面的逐步淤高,陡坎逐步向海移动。
To explore the evolution mechanism of tidal flats under the influence of multiple factors,a cross-shore profile numerical model is developed based on vegetation growth and tidal processes. For a bare flat driven by tides,a general convex cross-shore profile is obtained after medium-to long-term simulation. Sediment supply determines the width of mudflat,and a higher sediment supply leads to a wider and gentler mudflat. For marsh flats,different spatial distribution of biomass affects tidal hydrodynamics differently. At the upper intertidal flat,the flow reduction effect with parabolic distribution of biomass production is stronger than that with linear distribution,and it is converse at the lower intertidal flat. A scarp is simulated at the edge between the bare flat and marsh flat,and it moves seaward as the sediment deposition on intertidal flats.
作者
龚政
白雪冰
靳闯
赵堃
周曾
张长宽
GONG Zheng;BAI Xuebing;JIN Chuang;ZHAO Kun;ZHOU Zeng;ZHANG Changkuan(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China;Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security,Hohai University,Nanjing 210098,China;School of Environment,University of Auckland,Auckland 92019New Zealand)
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2018年第6期877-886,共10页
Advances in Water Science
基金
国家自然科学基金国际(地区)合作与交流项目(51620105005)
中央高校基本科研业务费专项资金资助项目(2017B41614).
关键词
潮滩
地貌演变
植被影响
盐沼陡坎
数值模拟
tidal flat
morphological evolution
biophysical effects of vegetation
marsh-edge
numerical simulation
