The Characteristics and Changes of Benthic Resources in Nha Phu Waters, Khanh Hoa Province (original) (raw)

2016, Tạp chí Khoa học và Công nghệ Biển

Impact of sand mining on sediment transport and morphological change of Hai Phong coastal area

Tạp chí Khoa học và Công nghệ biển, 2019

The paper presents the results of simulating the impact of sand mining on sediment transport and morphological change in Hai Phong coastal area based on Delft3D model. Scenario groups are established: Present scenarios without sand mining and simulated scenarios of the present sand mining (assuming 30% sand compared to plan). The scenario groups are calculated in the dry and rainy seasons for main wind directions (NE, SE, SW) in the case of moderate wind and strong wind. The results show that sand mining reduces sediment flow alongshore (2–81%) and seawards (5–83%). Besides, the increase in depth causes morphological change in this area: Rising the deposition rate (5–10 mm/month) at the sand mining locations; decreasing accretion rate and increasing the erosion rate in the neighboring areas of sand mining location.

CURRENT SITUATION OF RESOURCES AND (Lutraria rhynchaena) IN VAN DONG DISTRICT, QUANG NINH PROVINCE

2021

Received: 13/4/2021 This study aims to assess the resources and the current status of the art of shrimp farming in Van Don, Quang Ninh province today through investigation and survey. The data in the article are collected through methods of quick survey, investigation and interviews with people. The results obtained at Van Don mainly distributed the comedones Lutraria rhychaena (Jonas 1844) with density ranging from 0,1-0,2 species/m2, species Lutraria arcuata (Deshayes in Reeve, 1854) only appears in Dong Xa with very little density. The area of distribution of these two species has been pushed offshore, the aquatic resources are seriously reduced and the cultivated area is being replaced by a number of other mollusks. Through a survey of 400/1250 households with aquaculture jobs in 8 towns and townships in Van Don district, 152 households still maintain the profession of cultivating comedy, the farming households are scattered in the district with very small area out of a total of...

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