Preliminary results of the study on the reasons of the Hai Hau erosion phenomenon

2007 ◽  
Vol 29 (3) ◽  
pp. 415-426
Author(s):  
Pham Van Ninh ◽  
Phan Ngoc Vinh ◽  
Nguyen Manh Hung ◽  
Dinh Van Manh

Overall the evolution process of the Red River Delta based on the maps and historical data resulted in a fact that before the 20th century all the Nam Dinh coastline was attributed to accumulation. Then started the erosion process at Xuan Thuydistrict and from the period of 1935 - 1965 the most severe erosion was contributed in the stretch from Ha Lan to Hai Trieu, 1965 - 1990 in Hai Chinh - Hai Hoa, 1990 - 2005 in the middle part of Hai Chinh - Hai Thinh (Hai Hau district). The adjoining stretches were suffered from not severe erosion. At the same time, the Ba Lat mouth is advanced to the sea and to the North and South direction by the time with a very high rate.The first task of the mathematical modeling of coastal line evolution of Hai Hau is to evaluate this important historical marked periods e. g. to model the coastal line at the periods before 1900, 1935 - 1965; 1965 - 1990; 1990 - 2005. The tasks is very complicated and time and working labors consuming.In the paper, the primarily results of the above mentioned simulations (as waves, currents, sediments transports and bottom - coastal lines evolution) has been shown. Based on the obtained results, there is a strong correlation between the protrusion magnitude and the southward moving of the erosion areas.

1997 ◽  
Vol 21 (12) ◽  
pp. 779-780 ◽  
Author(s):  
John Wallace

After the fall of South Vietnam to North Vietnamese forces in 1975, Vietnam has remained virtually isolated from the rest of the world. With the global political changes of the past 10 years. the Hanoi Government succeeded in reducing Vietnam's international isolation in part by attempting to open the country's door to foreign visitors. The country stretches along the eastern coast of the Indo-Chinese peninsula and is slightly larger than Italy. It is ‘S-shaped’, broad in the north and south and very narrow in the centre (Fig. 1). The country's main cultivated areas are the Red River delta in the north and the Mekong delta containing Ho Chi Min city (Saigon) in the south.


2020 ◽  
Author(s):  
Duy Nghia Pham

Vietnamese National Olympiads 2010-2020 has awarded elite students more than 24,000 prizes. Provinces in the Red River Delta and the North Central Coast with their high schools for the gifted led the country in the number of elite students and the proportion of highest achievers. In comparison with social science test subjects, natural science subjects were more characterized by younger students and male students and less represented by ethnic minority students.


2014 ◽  
Vol 5 (1) ◽  
pp. 1-7
Author(s):  
Thi Thanh Ly Le

Rice and maize are global staple food and play an important role in world’s food security strategy. Vietnam is one of rice leading export countries but annually it has to import a considerate amount of maize for cattle food processing. Red River Delta in the north of Vietnam is the second rice bucket of the country, which is responsible for more than 20% of total rice production. The priority crops in the areas are rice and maize and rice-maize system is the leading cropping system in the area. Currently, it is reported that the rice-maize cropping system is not sustainable and its profit is reducing in most of production areas in the Red River Delta. Improving rice cropping system aims is not only to increase rice and maize yields and production but also to improve the land use efficiency, decline the cost of the production and to increase system sustainability. To increase sustainability there must be a linkage of various factors. This review emphasizes on increasing rice-maize crop sustainability by applying appropriate agriculture practices such as reducing chemical fertilization and intensive tillage. Gạo và ngô là nguồn lương thực chính cho toàn cầu và đóng một vai trò quan trọng trong chiến lược an ninh lương thực của thế giới. Việt Nam là một trong những nước dẫn đầu về xuất khẩu gạo nhưng hàng năm vẫn phải nhập một số lượng lớn ngô để chế biến thức ăn gia súc. Đồng bằng sông Hồng là một trong hai vựa lúa lớn của Việt Nam sản xuất khoảng 20% sản lượng lúa gạo của cả nước. Ở đồng bằng sông Hồng, lúa và ngô là hai cây trồng chính là hệ canh tác lúa-ngô là cơ cấu cây trồng hàng đầu trong vùng. Tuy nhiên, trong những năm gần đây, rất nhiều đánh giá cho thấy hệ thống canh tác lúa-ngô là hệ thống canh tác không bền vững và các lợi nhuận của mang lại từ cơ cấu canh tác ở hầu hết các khu vực sản xuất ở vùng đồng bằng sông Hồng của Việt Nam đã và đang giảm dần. Do đó, việc cải thiện cơ cấu canh tác lúa -ngô không chỉ nhằm mục đích tăng năng suất lúa và ngô mà còn nâng cao hiệu quả sử dụng đất, giảm chi phí sản xuất và tăng cường hệ thống canh tác bền vững. Tuy nhiên, để tăng tính bền vững của hệ thống canh tác thì phải liên kết nhiều yếu tố khác nhau. Bài viết này dựa vào các kết quả nghiên cứu của các tác giả khác nhau để đưa ra những giải pháp tích cực làm tăng tính bền vững của hệ thống canh tác lúa - ngô bằng cách áp dụng các phương pháp canh tác hợp lý như giảm sử dụng phân hóa học và các biện pháp canh tác thâm canh như áp dụng phương pháp làm đất tối thiểu.


Author(s):  
Luc Reychler

One of the most important challenges facing the global community in the next decade, is the prevention of destructive conflicts. Listening to the discourse in the United Nations and other governmental and non governmental organizations this may sound like kicking in wide open doors (Bauwens and Reychler, 1994). But the failure of conflict prevention and the high number of conflict zones, indicates that we still have a long way to go. A global survey of contemporary conflicts counts 22 high-intensity and 39 lowerintensity conflicts, and 40 serious disputes (PIOOM, 1995). In 1995 five groups were victims of genocides or politicides. The risks of future victimization of 47 communities in different parts of the world is assessed as high of very high (PIOOM, 1995). The growth of nationalist feelings at the end of the Cold War is only the beginning of more suffering. More conflicts are expected, with old and new causes, such as the unequal or unfair trade balances between North and South, unemployment in the North, the environmental pollution, religious extremism, mass immigration and the growing number of failed states. These problems could hurt people so much that they would be prepared to fight for them.


Author(s):  
Hoang Quoc Lam ◽  
Nguyen An Thinh

Hai Hau - Nghia Hung are two coastal districts in the Southeast of Nam Dinh province with total area of 35,652.29 km2. Located in the middle between the Southern provinces of the Red river delta and the North Central provinces, Hai Hau and Nghia Hung are about 100 km from Hanoi along National Route 1A and 80 km from Hai Phong, in an area directly affected by the Hanoi - Hai Phong - Quang Ninh growth triangle. The two districts have an approximately 47 km coastline accounting for over 65% of the coastline of the province. Along the coastline there are four rivers: Red river, So river, Ninh Co river and Day river emptying into the sea through the estuaries: Ba Lat, Ha Lan, Ninh Co and Day, which facilitate the development in industry, agriculture, sea ports, trade, tourism... This is also a region with high-speed economic development and a series of plannings. Thus, a number of conflicts in exploiting and using natural resources and environmental protection have been raised, leading to destroyed sceneries, lost ecological balance, and becoming an anxious problem. This paper presents experimental results in defining the conflicts and priorities between sectors and economic fields in integrated coastal space planning of Hai Hau - Nghia Hung districts to select the economic sectors that have the most potential and advantages. Therefore, it will be appropriate in space usage in exploiting and using natural resources and environmental protection, which will provide the basis for the development of a sustainable marine economy.


1991 ◽  
Vol 105 (1) ◽  
pp. 1-31
Author(s):  
Saskia De Bodt

AbstractThe article starts by taking stock of research into North and South Netherlandish professional embroidery in the sixteenth and seventeenth centuries. Such embroidery, which was rarely or never signed, and much of which has been lost, has hitherto been studied largely on stylistic grounds and grouped around noted schools of painting. Classifications include 'circle of Jacob Cornelisz van Oostsanen', for instance, or 'Leiden school/influence of Lucas van Leyden'. The author advocates a more relative approach to such classification into schools. She suggests that only systematic archive research in each location can shed new light on the production of embroidery studios and that well-founded attributions hinge solely on such research. The embroidery produced in Utrecht between 1500 and 1580 is cited as an example. The invoices of Utrecht parish and collegiate churches from circa 1500 to the Reformation record not onlv commissions to painters, goldsmiths and sculptors but also many items referring to textiles, notably embroidery. Together they provide a clear and relatively complete picture of the activities of sixteenth-century Utrecht embroiderers, whose principal customers were the churches. The items in question moreover exemplify the craft of the North Netherlandish embroiderer in that period in general in terms of what was produced as well as of the method and position of these artistic craftsmen, who were less overshadowed by painters than is generally assumed. A brief introduction outlining the organization of professional Utrecht embroiderers, who became independent of the tailors' guild in 1610 and acquired their own warrant, is followed by the analysis of an order from the Buurkerk in Utrecht for crimson paraments in 1530: three copes, a chasuble and two dalmatics. The activities of all those involved in their production are recorded : the merchants who supplied the fabric, the tracers of the embroidery patterns, the embroiderer, the cutter, various silver-smiths and the maker of the chest in which the set of garments was kept. The embroiderer was the best-paid of all these specialists. It is interesting to note that some Utrecht guild-members worked free of charge on these paraments, and that the collection at the first mass at which they were worn was very generous. There were probably political reasons for this: some of the donators, Evert Zoudenbalch and Goerd van Voirde, had been mayors at the time of the guild rebellion in Utrecht, and the Buurkerk was the parish church where the guild altars stood. After this detailed example the author discusses Utrecht embroiderers known by name and their studios,comparing them with a list of major commissions carried out for churches in Utrecht (appendix I). It transpires that in each case one studio received the most important Utrecht orders. This is followed by the reconstruction of three leading figures' careers. First Jacob van Malborch, active till 1525; a contract (1510) with the Pieterskerk in Utrecht regarding blue velvet copes is cited (appendix 11). He is followed by the embroiderers Reyer Jacobs and Sebastiaen dc Laet. Among his other activities, the latter was responsible for repairing and altering the famous garments of Bishop David of Burgundy. Items on invoices arc then cited as evidence that the sleeves of two dalmatics now in the Catharijneconvent Museum, embroidered on both sides with aurifriezes donated by Bishop David, were made by Jacob van Malborch in 1504/1505. This shows that systematic scrutiny of invoices and the results of archive research concentrated on individual embroiderers in a single city, compared with preserved items of embroidery, yield information that can lead to exact attributions to an artist or a studio (figs.4a to c and 5a to c). The Catharijneconvent Museum also possesses a series of figures of saints embroidered by the same hand (fig. 14). Finally, the author points out that a group of embroidered work (previously mentioned by H. L. M. Defoer in the catalogue Schilderen met gouddraad en zyde (1987)) which historical data suggest was done in Utrecht and which was produced in the same period, are almost certain to have come from Jacob van Malborch's studio, despite the lack of archival evidence (figs. 6 to 13).


2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Annie Melinda Paz-Alberto 1 ◽  
Edmark P. Bulaong 1 ◽  
Ranilo B. Lao 1 ◽  
Eleazar V. Raneses 1 ◽  
Bennidict P. Pueyo 1

Geophysical changes of the river outlets, riverbanks and coastlines in Alaminos, Pangasinan were measured using Google Earth from 2009 to 2014. On the other hand, actual measurements were gathered using South Total Station (NTS-362R6L) in 2015. The insights of the residents regarding feature changes of the river were obtained through one on one interview. Root Mean Square Errors (RMSE) were computed for measurement and horizontal positional accuracy of Google Earth. To perceive the effects of sea levels, historical data (2004-2015) from Bolinao, Philippines Tide Chart at online tides and currents predictions were also analyzed. Alaminos river outlets decreased in width size due to natural factor and human activities. Alaminos riverbank increased in width size which could be possibly due to natural calamities and weak bank resistance brought about by the frequent flooding caused by heavy rains and the emergency released of water from San Roque Dam. Generally the north and south coasts of Alaminos River increased and expanded. Rise in sea level is also a probable cause of changes wherein heights of low tides in Pangasinan Gulf is increasing overtime. The computed RMSE was low which indicate positional accuracy and measurement of Google Earth in the study area.


2018 ◽  
Vol 18 (3) ◽  
pp. 269-277
Author(s):  
Nguyen Thị Nhan ◽  
Nguyen Xuan Tung ◽  
Bui Thi Bao Anh ◽  
Nguyen Xuan Thanh

In recent years, some geological hazards relating to the change of channel such as accretion, erosion and landslide of river bank on the Red River bank have occurred more frequently. In this paper, the trend and rate of the change of the Red River bank in the area from Son Tay to Gia Lam (Hanoi) were shown by using remote sensing images of the period 2007–2016, geographic information system (GIS) and Digital shoreline analysis system. The results indicate that bank erosion mainly occurred along the both sides of the Red River bank with the average erosion rate ranging from 1.5 m/yr to 3m/yr. The strongest erosion was along the left river bank in Me Linh commune, Dong Anh district. In Son Tay commune, Phuc Tho district, Vinh Phuc province, some signals of erosion process were also recorded. The accretion process had been occurring in the middle part of the river slowly with the accretion rate of 0.8–1.4 m/yr. In the result, accretion zones were formed and they were aggregated into alluvial flats. In the future, the Red river bank will continue to be changed, erosion and landslide of the channel would be considered as the major hazards in this area.


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