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Hiện trạng tài nguyên môi trường đầm phá tam giang cầu hai (thừa thiên huế) đề xuất kế hoạch sử dụng bền vững

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Tieu ban TAI NGUYEN SINH VAT BIEN vA N G U O N LQI 187 STATUS OF ENVIRONMENT AND BIOLOGICAL RESOURCES IN THE TAM GIANG CAU HAI LAGOON (THUA THIEN HUE) AND PROPOSED PLAN FOR SUSTAINABLE USES* Do Cong T[.]

Tieu ban: TAI NGUYEN SINH VAT BIEN vA N G U O N LQI 187 STATUS OF ENVIRONMENT AND BIOLOGICAL RESOURCES IN THE TAM GIANG - CAU HAI LAGOON (THUA THIEN - HUE) AND PROPOSED PLAN FOR SUSTAINABLE USES* Do Cong Thung**, Massimo Sarti *** * • The paper is supported by IMOLA Project ** : Institute of Marine Environment and Resources, Vietnamese Academia of Science ***.• Polytechnic ofMarche Italy Materials and methods The report was presented by results of four surveys on total of 37 sites on 12 fransects along the lagoon from north to south have repeatedly surveyed (fig 1) organized by IMOLA in the lagoon on April, May, August, November 2006 and including results of surveys of the project "BIOD" cooperated both Viefriam and Italy in years 2003, 2004 and 2005 The used methods for surveys are according of the manual method for marine of the Committee of Science and Technology of Vietnam (1981) and method for marine monitoring of the Environmental Departinent of MOSTE (1997), Canada - ASEAN (1997), Wilkinson and Baker (1998) Results • Meteorology Typical characteristic of this region is rainy season often in late period of the year (in winter from September to December) with total of rainfall is 2000mm (72.8%) High rainfall concenfrates in October and November at peak on October (740mm, 26,96%) The rainfall of the rest months is not noticeable Due to high rainfall eoncenfrate in a few months lead to flood may occur in winter In summer it is often dry because of low rainfall • Hydrographic Hydrographic characteristics of lagoon are affected by river hydrograph and oceanography Fluctuation of water level in the lagoon is irregular between locations inside the lagoon and between lagoon and the sea Water exchange between lagoon and sea by two inlets as Thuan An and Tu Hien inlet It was calculated by 3-Delf model of Dynamic Institiite of Harland • Characteristics of the Waters in Tam Giang - Cau Hai Lagoon - Temperature: Average of air temperature in the area is 25.2^0 the same as air temperatiire in the whole countiy, but it is higher than the north of Vietnam, the highest in July (29.6°C) and the lowest in December (19.9''C) - Salinity: The analysis results showed that changes in salinity were very complex, some areas have been clearly found sfratification In April salinity changed from less than l%o to 31.5%o, surface average was 11.0%o and bottom was 12.4%o After one month (May, 2006) salinity increased from

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