The important role of Turbidity Maximum Zone in sedimentary dynamic of estuarine mangrove swamp

doi:10.1007/s11707-022-1083-1

Front. Earth Sci.

2024, Vol. 18

Issue (1) : 219-226 https://doi.org/10.1007/s11707-022-1083-1

The important role of Turbidity Maximum Zone in sedimentary dynamic of estuarine mangrove swamp

Tao LIU¹, Ying LIU²(

), Baoqing HU¹

¹. Key laboratory of Environment Change and Resources Use in Beibu Gulf (Ministry of Education), Nanning Normal University, Nanning 530001, China
². School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China

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Abstract

Sedimentation is a key process affecting wetland sustainability and carbon burial flux. In context of sea level rise, climate change and human activities, further understanding about the sedimentary dynamic in wetland is critical in predicting the landscape evolution or the change in carbon burial flux. In this study, based on the field hydrological observation in a mangrove system in the Nanliu River estuary, we found the net flux of suspended sediment to mangrove is 39−72 kg/m in tidal cycles with Turbidity Maximum Zone (TMZ) forming in surface layer and only is 9−18 kg/m in tidal cycles without TMZ. The higher net flux of suspended sediment to mangrove in tidal cycles with TMZ forming in surface layer is attributed to high SSC in rising tide and intense flocculation in mangrove. The significant discrepancy in sedimentation rate in the mangrove patches also can be explained by the probability of TMZ forming in the surface layer of estuary. In future, rapid sea level rising may lead to the change of TMZ pattern in estuary, which will result in non-negligible variation in sedimentation rate in wetlands. According to the present data of sedimentation rate in wetlands, the fragility of wetlands in river estuary may be miscalculated.

Keywords mangrove wetland sedimentation Turbidity Maximum Zone Nanliu River

Corresponding Author(s): Ying LIU

Online First Date: 19 December 2023 Issue Date: 15 July 2024

Cite this article:

Tao LIU,Ying LIU,Baoqing HU. The important role of Turbidity Maximum Zone in sedimentary dynamic of estuarine mangrove swamp[J]. Front. Earth Sci., 2024, 18(1): 219-226.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-022-1083-1
https://academic.hep.com.cn/fesci/EN/Y2024/V18/I1/219

Fig.1 (a) Location of Nanliu River estuary and study area; (b) position of hydrology observation site and sediment cores.

Fig.2 Fitting function of turbidity to SSC.

Fig.3 (a) Daily variation of maximum tide height; (b) Daily averaged river discharge during June, 2014.

Fig.4 Time series of water depth (a), current speed (b), salinity (c) and SSC (d) during 11 tidal cycles at site1.

Fig.5 TMZ in the in surface layer of Dangjiang River identified in satellite image (from Google Earth).

Fig.6 TMZ pattern analysis based on hydrological parameters in the estuary of Dangjiang branch (a−d) and (e) the inferred position of TMZ at the beginning of mangrove inundation.

Fig.7 Time series of hydrological parameters in the surface layer at site 2 (a−c) and site 3 (d−f), which were observed during December 26th−27th in 2012.

Fig.8 Net flux of suspended sediment imported to mangrove during tidal cycles at site 1.

Fig.9 Depth profile of excess ²¹⁰Pb specific radioactivity in sediment cores.

Tab.1 The sedimentation rate in mangroves in different river estuary

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