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为探讨潮沼植物对动力沉积过程的影响 ,在长江口南汇东滩沼泽和邻近的光滩上进行了近底层流速、波浪、悬沙浓度、沉积物粒径和滩面淤积速率等对比实验 ,并在九段沙潮沼中做了两种先锋植物黏附悬沙的实验 .结果表明 ,沼泽和同高程的邻近光滩近底层平均流速的比值为 0 .1 6～ 0 .84;两种环境平均波周期、平均波高和平均悬沙浓度的比值分别为 1 .4,0 .43,和 0 .71 .波浪传入沼泽后 ,一方面波高大大降低 ,另一方面变得规则有序 .海三棱草和草两种先锋植物群落黏附的悬沙分别达到 2 98和40 g/m2 .由于水动力降低和植物的捕沙功能 ,细颗粒泥沙易于在沼泽中沉积下来 ,导致沼泽环境沉积物明显较相邻光滩细 ;沼泽中沉积速率加快 ,侵蚀受到抑制 .
In order to investigate the influence of tidal marsh plants on the dynamic deposition process, comparative experiments such as near-bottom flow velocity, wave, suspended sediment concentration, sediment grain size and beach sedimentation rate were conducted on Dongtan swamp and adjacent light beach of the Yangtze Estuary. And the experiment of two pioneer plants adhering to suspended sediment was carried out in Jiuduang tidal flats.The results show that the ratio of average velocity of near bottom of adjacent light beach to marsh and the same elevation is 0.16 ~ 0.84; Wave period, the average wave height and the average suspended sediment concentration ratio of 1.4, 0.43, and 0.71 wave into the swamp, on the one hand the wave height is greatly reduced, on the other hand become regular and orderly. The suspended sediment adhering to the two pioneer plant communities, Prickly and Wrasse, respectively, reached 988 and 40 g / m2, and fine-grained sediments were easily deposited in swamps due to the reduced hydrodynamic force and the plant’s sediment-holding function, resulting in a swamp environment Sediment was significantly thinner than the adjacent light beach; deposition rate of swamp accelerated, erosion was suppressed.