Phu Quy Research Articles

SIMULATION ANALYSIS TO FORECAST PROGRESS AND OPTIMIZE RESOURCE UTILIZATION FOR MATERIAL TRANSPORTATION ACTIVITIES IN THE CONSTRUCTION PROJECT ON PHU QUY ISLAND

This article presents the main results of using a simulation tool to predict time and optimize the resource utilization for the transportion of materials processes in the construction project on Phu Quy island. A simulation model, which includes activities of material transfer processes, has been established and developed based on the EZStrobe simulation program. Various simulation scenarios with different resource usage options have been analyzed. The simulation results are also compared and evaluated with real-world project data. It indicates that for both productivity, time and cost, the option of using two 50-ton cranes at the dock; two 25-ton cranes at the storage yard and four trucks will be the best solution. The results of the study demonstrated the effectiveness of the simulation program, which may help managers choose the resource allocation plan and apply necessary changes to obtain the optimum results in terms of production and cost efficiency for the transportion of contruction materials on the island.

Wave Regime of Vietnamese Waters on the Basis of Numerical Modeling and Field Measurements

This paper presents results of research of the wave regime in Vietnamese waters (South China Sea) based on the data of numerical modeling data using the WAM model (WAVE Modeling). The model domain covers the basin of the South China Sea (SCS). The bathymetry of the SCS used in the model is based on the ETOPO5 digital database. Wind parameters are based on the six-hour NCEP/NCAR reanalysis data with a resolution of ΔX = ΔY = 0.25° over the period 1979–2021. The field wave data measurements were collected by the Institute of Oceanography of Vietnam Academy of Science and Technology in the southern central Vietnamese waters in 2013. The statistical data of computed wave characteristics for the period of 43 years (1979–2021) illustrate that the main wave direction in Vietnamese waters was NE during the Northeastern (NE) monsoon, and in the opposite direction during the Southwestern (SW) monsoon. The NE monsoon wave was more dominant than that of the SW monsoon wave. Recurrence frequency (%) of significant wave height Hs >1.0 m (Hs – significant wave height is an average of 1/3 the largest of serial waves relative to average seawater level) greater than 50%
 covered the northeastern, central region of the SCS, and central Vietnamese coast. The wave recurrence frequency in the Gulf of Tonkin and Gulf of Thailand was <40% and <30%, respectively. The central Vietnamese coast from Ly Son Island to Phu Quy Island was the strongest affected by wave action. The recurrence frequency of the maximum significant wave height Hs >3.5 m was greater than 1.5%. The Gulf of Tonkin (Bach Long Vi Island) and the Gulf of Thailand (Tho Chu Island) were less affected by
 wave action than the central Vietnamese coast: the recurrence frequency of the maximum wave height (Hs>3.5 m) was less than 0.1%. Phu Quy and Con Dao Islands were more influenced by wave action during both seasons than the central coast of Vietnam.

Preliminary Results of Modelling Simulation for High-resolution Hydrodynamic Fields for Central Vietnam's Water

This paper presents the development of hydrodynamic simulation models (waves, currents) for the Vietnam East Sea and nestingto coastal area (applied in the coastal area of ​​Phu Yen province). The COAWST modeling system has been used. This is an open source system which supports optimal parallel calculation and allows solving large-scale simulation problems. The model has been calibrated and verified by deep water wave data at the stations of Bach Long Vi, Con Co, Phu Quy and Phu Quoc for good results. Along with that, with the goal of having high resolution for the central Vietnam water, the model has been set up with coastal wave data in Phu Yen for very good results, the correlation coefficient between calculation and measurement is up to 0.95. The results of the current field, surface temperature from the model of the ocean shows the similarity with the verification data, especially simulating the typical rising water phenomenon in Ninh Thuan - Binh Thuan area. However, some stages have complicated movements, the model has not been closely simulated, for example in the area of Phu Quy island.

Activity of radioactive isotopes in the offshore seawater at vicinity areas of Phu Quy, Phu Quoc and Bach Long Vy islands

In this work, activity of radioactive isotopes in some offshore seawater samples at vicinity areas of three islands has been investigated Phu Quy (Binh Thuan province), Phu Quoc (Kien Giang province), and Bach Long Vy (Hai Phong province). The ranges of radioactivity 226Ra, 238U, 137Cs, 90Sr, and 239,240Pu in seawater at three offshore islands are 2.09 ÷ 4.77 mBq/L, 2.33 ÷ 4.95 mBq/L, 0.98 ÷ 1.45 mBq/L, 1.22 ÷ 1.49 mBq/L, and 0.0045 ÷ 0.0066 mBq/L, respectively. These values show that the radioactivities of the above-mentioned radionuclides differ between monitoring periods and between three offshore islands of Vietnam, but which is equal to or lower than the corresponding value according to others seas in Vietnam and Asia – Pacific. The correlation between radioisotopes and properties of seawater (pH, conductance, and salinity) is also shown in this study to assess their impact on the fluctuations of the above radinuclides.

Geotourism Potential Of Phu Quy Island, Binh Thuan Province

Phu Quy island – Binh Thuan province, is 120 km southeast of Phan Thiet city, where the long – lasting destruction of waves, wind, and rain into oceanic volcanic materials formed four significant geomorphological heritages. These geomorphosites have scientific and additional values (cultural, aesthetic, and ecological values), of which mountain Cao Cat cinder cones deserves to be a South Central Coast geomorphosite; while mountain Cam volcano, Hang Cliff – Nho beach erosion coast and Tranh volcanic islet are proposed at a local level. The impressive cliffs exposed layers of coarse and steeply sloping sediments caused by blasting; erosion coastal terrain such as cliffs, rocky headlands, stacks, arch, islets, etc. all shapes and colors associated with landmarks such as Mong Tay tack, Gam inlet, Ban inlet, Xuong Ca headland, Phat inlet, Dried Squid pond, Den islet, Giua islet, Do islet... are outstanding scientific values. Furthermore, Sa Huynh cultural relics (2,500 – 3,000 years ago) discovered in mountain Cao Cat; Linh Son, and Linh Buu ancient pagodas; Phu Quy landscape viewpoints from mountain Cam Lighthouse or colorful coral reefs on Tranh islet... are additional values that increase the worth of Phu Quy island's geomorphosites. Interpreting the scientific and additional values of these geomorphosite with images, books, geometrically similar models, etc. would promote the geotourism – a niche of the sustainable tourism market that is developed along with Global Geoparks recognized by UNESCO.

Assessment of the current environmental status in the Phu Quy district, Binh Thuan province using sustainable development indicators

The objective of this study was to develop a set of sustainable development indicators on environmental aspects and apply them to assess the level of environmental sustainability in Phu Quy district, Binh Thuan province. The set of sustainable development indicators was built based on the screening of indicators from some previous studies, as well as developing new indicators to match the research area. The indicators were then be grouped into topics based on the United Nations' 17 sustainable development goals to 2030. In terms of environment, the set of sustainable development indicators includeed 6 topics (main components), 19 indicators (sub-components), of which 6 new indicators were researched and developed for the island and sea area. The result showed that the level of environmental sustainability of the Phu Quy district was good (0.846). In addition, the results showed that the local environmental aspects attained levels of sustainability. Accordingly, main components including clean water - sanitation (MT1), habitat (MT3), natural disaster prevention (MT4) and ocean conservation - sustainable use (MT5) reached the good level of sustainability and tend to keep stable. While sustainable energy (MT2) and forest protection and development (MT6) are quite sustainable. However, the MT6 component tended to decrease that indicated the forest degradation and the impacts on environmental sustainability in Phu Quy district in the future.

TÍNH PHÂN BẬC CỦA ĐỊA HÌNH ĐÁY BIỂN QUANH MỘT SỐ ĐẢO VEN BỜ VIỆT NAM

Tính phân bậc của địa hình đáy biển quanh các đảo Bạch Long Vĩ, Cồn Cỏ, Lý Sơn, Phú Quý, Hòn Khoai và Thổ Chu đã được phân tích trên cơ sở dữ liệu đo sâu chi tiết với khoảng sâu đều 1m và sử dụng phần mềm Arcgis 10.4. Kết quả phân tích hình thái các mặt cắt địa hình đáy biển, được xây dựng tự động bởi phần mềm máy tính, thể hiện khá chi tiết và đáng tin cậy. Các kết quả cho thấy đặc điểm phân bậc địa hình đáy biển các đảo ven bờ có những nét chung và riêng tùy thuộc vào các khu vực đáy biển khác nhau. Các đảo ven biển Bắc bộ và Nam bộ (Bạch long Vĩ, Hòn Khoai, Thổ Chu) các bậc chỉ thể hiện đến độ sâu dưới 50m, Hòn Khoai chỉ đến 30m, trong khi đó ở các đảo Nam Trung bộ (Lý Sơn, Phú Quí) thể hiện đến độ sâu trên dưới 100m. Tổng hợp chung các bậc địa hình đáy biển của các đảo ven bờ Việt Nam gồm 0-2m, 5-8m, 12-14m, 20-25m, 25-27m, 27-30m, 32-35m, 40-45m, 45-50m, 53-55m, 60-65m, 65-70m, 75-85m và 90-115m.

Development Trend of Small Island District in Tropical Monsoon Region (Case Study: Ly Son and Phu Quy Island Districts, Vietnam)

Ly Son (Quang Ngai province) and Phu Quy (Binh Thuan province) are two island districts in Vietnam that have similar natural characteristics; both are facing the issues of sustainable economic development. This research applied Man-Kendall model to estimate the trend of some socio-economic elements in these two island districts that have been collected during the period of 2002-2018. In general, socio-economic factors showed a tendency to increase recently. Ly Son island district has faster growth rate than that of Phu Quy because Phu Quy is farther from the mainland, more difficult to access and this island district does not own distinct local products. However, with the current development speed, Ly Son is facing several consequences such as insufficient water sources to meet the water demand and security instability due to the increasing number of visitors to the island. This research also proposed that, in order to sustainably develop the two island districts, there should be a specific structure for economic development orientation among sectors based on phased schedule. More importantly, tourism development planning should take capacity into consideration. Fishing practices should pay attention to methods and fishing equipment. Infrastructure investment for environmental protection as well as advocacy program to minimize the use of plastic bags should be done on a regular basis.

Coral reef fishes in the banks and rocky islands in the offshore waters of Binh Thuan province

Binh Thuan province is located in the South Central Coast of Vietnam with favorable conditions for living coral reefs. The coral reefs were mainly investigated in coastal water areas and Phu Quy island, meanwhile other areas such as the banks and rocky islands seem to lack information. This study was conducted to evaluate the species composition and distribution of coral reef fish communities in the Royal Bishop banks and around rocky islands in Julia shoal in the offshore waters of Binh Thuan province in April 2019. A total of 151 species belonging to 86 genera and 33 families of coral reef fishes were recorded. Among them, 4 species for the first time recorded in Vietnam are Helcogramma striata (Hansen, 1986) (Tripterygiidae), Pseudanthias squamipinnis (Peters, 1855) (Serranidae), Bodianus bilunulatus (Lacepède, 1801) and Coris aygula (Lacepède, 1801) (Labridae). The total average density of coral reef fish in the offshore waters of Binh Thuan is quite high at 1,104.9 ± 617 individuals/250 m2, most of them are small sized fish and ornamental fish group, the large sized fish and target fish group accounts for a relatively low rate, but their density here is much higher compared to that in the coastal waters of Binh Thuan province. The comparative analysis also shows that sites in coral reef around rocky islands have species richness and density of coral reef fish higher than the bank area.

Phát triển bền vững kinh tế biển đảo Phú Quý- tỉnh Bình Thuận: tiềm năng, thách thức và đề xuất giải pháp (Sustainable Development Maritime Economy of Phu Quy Island – Binh Thuan Provine- Potentials, Threads and Solutions Suggested)

Vietnamese Abstract: Nghien cứu nhằm mục tieu khai quat cơ sở lý thuyết về phat triển kinh tế biển. Đồng thời, xem xet những tiềm nang va thach thức phat triển bền vững kinh tế đảo Phu Quý. Tren cơ sở phân tich, tac giả đa đề xuất 05 gợi ý giải phap nhằm giup Đảo Phu Quý co thể phat triển kinh tế biển một cach hiệu quả dựa tren những tiềm nang vốn co. English Abstract: This resarch aims at reviewing theorical base of maritme economy development, concurrently, reviewing potentials and threads of developing maritime economy of Phu Quy island. The results also reveals 05 suggested solutions to help Phu Quý island develop maritime economy effectively based on its potentials.

STATUS AND TRENDS OF CHANGE IN DISTRIBUTION OF MARINE HABITATS IN NHA TRANG BAY

Assessments of status and temporal changes in distribution of marine habitats in Nha Trang bay were conducted by using interpretation of remote sensing (Orbview 3, SPOT5, ALOS-AVNIR2 and Landsat 8-LCM) and aerial images in combination with ground truthing at 50 key sites representing coral reefs (25 sites), seagrass beds (10 sites), mangroves (5 sites), rocks (5 sites) and sand (5 sites) in 2015. A total of 812 ha of key marine habitats was recorded in 2015 including 754.1 ha of coral reefs, 52.4 ha of seagrass beds and 5.4 ha of mangroves. There was a notable decline in areas of the above marine habitats in the period of 2002 - 2015, in which 64 ha of seagrass beds (equivalent to 45%; mainly at Bai Tien, Phu Quy, Mui Nam and Vung Me, Đam Gia, Song Lo) and 117.4 ha of coral reefs (equivalent to 13.5%; mainly at Dam Gia, Duong De, Song Lo, Bai Tien and Eo Co) have been lost with an exception of increase of 3.1 ha of mangroves by new transplantation project conducted by Nha Trang MPA authority in Dam Bay during the last few years. The decline in the areas of coral reefs and seagrass beds has been caused by expansion and reclaimation of infrastructure for community and tourism development in recent years.

Seismic activity characteristics in the East Sea area

Seismic activity characteristics in the East Sea area

Geochemistry of late miocene-pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generation

Geochemistry of late miocene-pleistocene basalts in the Phu Quy island area (East Vietnam Sea): Implication for mantle source feature and melt generation

Dragonets (Callionymidae) of soft bottoms from the coastal zone of southern Central Vietnam

A review of dragonets (Gallionymidae) from the coastal waters of Khanh Hoa (Nha Trang and Van Phong bays) and Binh Thuan (Phu Quy Island) provinces, Vietnam, was conducted based on the samples of the author. In total, nine species were recorded, including three species indicated in the fauna of the country for the first time. In addition, geographic and bathymetric distribution of C. altipinnis, as well as morphological variation of several other species, was specified.

Fauna of anemonefishes (Pomacentridae, Amphiprioninae) and their host sea anemones (Cnidaria, Actiniaria) on reefs of Phu Quy, Con Son, and An Thoi Islands (South China Sea, South Vietnam, and Gulf of Thailand) and a review of these groups from the coastal waters of Vietnam

A full species composition of anemonefishes (Pomacentridae, Amphiprioninae) and their host sea anemones (Cnidaria, Actiniaria) from reefs of Phu Quy and Con Son Islands (off South Vietnam) and An Thoi Islands (northeastern Gulf of Thailand) is presented for the first time. A comparison of the faunas of anemonefishes and their host sea anemones is conducted in the coastal waters of Vietnam and adjacent waters. The presence of intermittent ranges of the anemonefishes in the coastal waters of Vietnam is demonstrated. For example, the ranges of two species, Amphiprion clarkii and A. frenatus, include the coastal waters of Vietnam, excluding the Gulf of Thailand, where they are not found even at the eastern border of the gulf. A. perideraion is absent in the Gulf of Tonkin, but it is distributed to the south along the entire coastal zone of Vietnam, including the Gulf of Thailand. In the coastal waters of Vietnam, A. sandaracinos is distributed only between the Gulf of Tonkin and Gulf of Thailand. A. polymnus is reliably indicated in the coastal waters of Vietnam between 12°50′ and 9°54′ N, but, most likely, its range is continuous along the entire Vietnamese coast. The richness of species composition of host sea anemones decreases (from nine to three species) in the southern direction, from Central Vietnam to the eastern border of the Gulf of Thailand.

TOURISM DEVELOPMENT POTENTIAL OF COASTAL ISLAND SYSTEM IN VIETNAM

Coastal island system in Vietnam distributes and stretches over 2000 km from Quang Ninh coastal sea to Kien Giang coastal sea. Because of the distribution in tropical monsoon belt, coastal island system ownes tremendous values of natural tourism potential; which are maritime climate with mild sunshine, and the place that contains a diversity of terrain, landscape and sea-island biological resources. In the coastal islands, there also exist various types of humanistic tourism resources, including ancient architectures, historical, cultural and archaeological relics, folk festivals and regional food culture. The values of natural and humanistic tourism potential of coastal islands are the foundation for the development of unique sea-island tourism, and the establishment of national and international famous tourism centers. The islands having potential and advantages for tourism development are firstly Vinh Thuc island, Van Don island area, Co To - Thanh Lam island group, islands in Ha Long - Bai Tu Long bay (Quang Ninh), Cat Ba (Hai Phong), Cu Lao Cham (Quang Nam), Ly Son (Quang Ngai), Hon Tre (Khanh Hoa), Phu Quy (Binh Thuan), Con Dao (Ba Ria-Vung Tau) and Phu Quoc (Kien Giang).

A new species of Dixonius (Squamata: Gekkonidae) from Phu Quy Island, Vietnam.

We describe a new species of Dixonius on the basis of five specimens from Phu Quy Island, Binh Thuan Province, in southern Vietnam. The new species can be distinguished from congeners based on molecular and morphological differences. Diagnostic features are: small size (SVL up to 44 mm); 7 or 8 supralabials; 11 or 12 rows of keeled tubercles on dorsum; 21-23 ventral scale rows; 5 or 6 precloacal pores in males; a canthal stripe running from rostrum through the eye and terminating behind the head; second pair of postmentals about one third to one half size of first pair; ground color of dorsum brown, with one or two rows of light yellow or orange spots in one or two rows along flanks, and irregular bands or a reticulated network of dark marks on dorsum. This is the fifth species of Dixonius known to occur in Vietnam.

New records of marine algae in Vietnam

In May, 2013, a scientific expedition was organized by the Vietnam Academy of Science and Technology (VAST) and the Far Eastern Branch of the Russian Academy of Sciences (FEBRAS) through the frame of the VAST-FEBRAS International Collaboration Program. The expedition went along the coast of Vietnam from Quang Ninh to Kien Giang. The objective was to collect natural resources to investigate the biological and biochemical diversity of the territorial waters of Vietnam. Among the collected algae, six taxa are new records for the Vietnam algal flora. They are the red algae Titanophora pikeana (Dickie) Feldmann from Cu Lao Xanh Island, Laurencia natalensis Kylin from Tho Chu Island, Coelothrix irregularis (Harvey) Borgesen from Con Dao Island, the green algae Caulerpa oligophylla Montagne, Caulerpa andamanensis (W.R. Taylor) Draisma, Prudhomme et Sauvage from Phu Quy Island, and Caulerpa falcifolia Harvey & Bailey from Ly Son Island. The seaweed flora of Vietnam now counts 833 marine algal taxa, including 415 Rhodophyta, 147 Phaeophyceae, 183 Chlorophyta, and 88 Cyanobacteria.

SOME NEW RECORDS OF MARINE ALGAE FROM VIETNAM

In May 2013, a scientific expedition was organized by the Vietnam Academy of Science and Technology and the Far Eastern Branch of the Russian Academy of Sciences (FEBRAS) in the frame of the VAST-FEBRAS International collaboration program. The expedition went along the coast of Vietnam from Quang Ninh to Kien Giang. The objective was to collect natural resources for investigation of the biological and biochemical diversity of the territorial waters of the Socialist Republic of Vietnam. Among the collected algae, six taxa are new records for the Vietnam algal flora. They are the red algae Titanophora pikeana (Dickie) Feldmann from Cu Lao Xanh Island, Laurencia natalensis Kylin from Tho Chu Island, and Coelothrix irregularis (Harvey) Børgesen from Con Dao Island, and the green algae Caulerpa oligophylla Montagne, Caulerpa andamanensis (Taylor, W. R., 1975) Draisma, Prudhomme et Sauvage from Phu Quy Island and Caulerpa falcifolia Harvey & Bailey from Ly Son Island. The seaweed flora of Vietnam now counts 833 marine algal taxa, including 415 Rhodophyta, 147 Phaeophyceae, 183 Chlorophyta and 88 Cyanobacteria.

THE SPECIES COMPOSITION, DISTRIBUTION, BIOMASS OF MOLLUSK (CLASS: GASTROPODA, BIVALVIA, CEPHALOPODA) IN CORAL REEF IN 19 SURVEYED ISLANDS IN VIETNAM

In 2010-2011, the project “Comprehensive surveys on biodiversity in coral reef ecosystems and islands in Vietnam sea aiming at the sustainable development” carried out the assessment of the species composition, distribution, biomass of mollusk in coral reef at 19 islands in Vietnam sea. By applying the morphological method, the results of status and resource of mollusk showed that 227 species belonged to 44 families, 13 orders of 3 classed of mollusk. Among them, there were 163 species of Gastropoda, 57 species of Bivalvia and 7 species of Cephalopoda. In terms of geographical distribution: The highest distribution was in Phu Quy island with 146 species, followed by Cat Ba - 144 species, Tho Chu -144 species, Cu Lao Cham - 137 species, Hai Van - Son Cha - 137 species, Nam Yet - 135 species, etc. Tran island had the lowest distribution with 81 species only. The depth distribution: Shallow water areas had 137 species, deep water areas had 115 species, there were a lot of species distributing in both. The similarity index of mollusk species composition between studied islands was average, around 0.35 - 0.68. Biodiversity index was around 0.53 - 1.52. Individual density was around 37 - 105 individuals/m2, the average was about 54 individuals/m2. Average biomass was about 5,029.2 gr/m2. There were 41 often exploited species for food, handicrafts, medicine. Among them, there were 4 vulnerable species (VU), 3 endangered species (EN) and 2 critically endangered species (CR).