Volume 42 Issue 7
Jul.  2023
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Zuming Huang, Zhijun Dai, Riming Wang, Xiaoyan Zhou, Wenhong Pang, Jiejun Luo, Bingbin Feng, Baoqing Hu. Dramatical hydro-sedimentary changes induced by bamboo fences over mangrove tidal flat of the largest delta in Beibu Gulf, southwestern China[J]. Acta Oceanologica Sinica, 2023, 42(7): 103-115. doi: 10.1007/s13131-022-2117-y
Citation: Zuming Huang, Zhijun Dai, Riming Wang, Xiaoyan Zhou, Wenhong Pang, Jiejun Luo, Bingbin Feng, Baoqing Hu. Dramatical hydro-sedimentary changes induced by bamboo fences over mangrove tidal flat of the largest delta in Beibu Gulf, southwestern China[J]. Acta Oceanologica Sinica, 2023, 42(7): 103-115. doi: 10.1007/s13131-022-2117-y

Dramatical hydro-sedimentary changes induced by bamboo fences over mangrove tidal flat of the largest delta in Beibu Gulf, southwestern China

doi: 10.1007/s13131-022-2117-y
Funds:  The National Natural Science Key Foundation of China under contract No. 41930537; the Key Research and Development Plan of Guangxi under contract No. AB21076016; the Marine Science Program for Guangxi First-Class Discipline, Beibu Gulf University; the China Postdoctoral Science Foundation under contract No. 2022M721150.
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  • Mangrove forest is one of the most important ecological and environmental resources by effectively promoting tidal flat deposition and preventing the coastal region from typhoon. However, there have been mass loss of mangrove forests due to anthropogenic activities. It is an urgent need to explore an effective way for mangrove restoration. Here, three rows of bamboo fences with hydro-sedimentary observation set over Aegiceras corniculatum mangrove tidal flat of the Nanliu Delta, the largest delta of Beibu Gulf, China, were conducted to analyze the hydro-sedimentary variations induced by bamboo fences. Results identified that the mean horizontal velocity Um per burst (20 min) decreased by as much as 71% and 40% in comparison with those without bamboo fences in March and November, respectively, when the tidal current entering the bamboo area during flood. The maximum of mean horizontal flow velocity Um-max at bamboo area was 50%–75% of that without bamboo fences during ebb tide. The suspended sediment concentration of bamboo area suggested a maximum reduction of 57% relative to bare flat during flood, and was 80% lower than bare flat at ebb peak. Moreover, the turbulent kinetic dissipation ε at flood tide was significantly higher than that at ebb tide, while the bamboo fences greatly increased the turbulent kinetic dissipation ε by 2 to 5 times relative to bare flat, resulting in an increase of the bed elevation by inhibiting the sediment incipient motion and intercepting suspended sediment. The siltation rate at the bamboo area was 140% and 29.3% higher than that at the bare flat and the region covered with A. corniculatum, respectively. These results highlight that bamboo fences can effectively attenuate tidal current and thus promote siltation over mangrove flat, which contribute great benefit to mangrove survival.
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