Estimating of lethal suspended sediment concentration for mangrovea case study in the dead mangrove forest in Tieshan Harbour in Guangxi
Large patches of mangrove forest have died between 2017 and 2020 due to the suspended sediment concentration(SSC)in high level caused by reclamation project at the Tieshan harbour of Guangxi province,China.This case reminds us that it is very necessary to determine the lethal SSC level for mangrove,which is helpful in mangrove protection in context of coastal engineering construction increasing.In this study,based on a one-dimensional diffusion equation and the parameters obtained from field survey,we calculated the settling speed of suspended sediment in flood tide in the died mangrove forest during reclamation project and determined the SSC in flood tide at the edge of died mangrove forest according to a SSC-settling speed curve.The result show that the average SSC within the dead mangrove patch is 2.7～5.9 g/L during reclamation project and the SSC is 2.0～4.6 g/L at the border of died mangrove forest-survival mangrove forest.This value(or a value adjusted from this value)is a conservative reference for the estimation or the the monitoring which is conducted to protect the mangrove forest under the threat of coastal engineering construction.
NETL
NSTL
万方数据
