Variation of Water Quality and Sediment Internal Loading in Shanzai Reservoir as the Second Drinking Water Source for Fuzhou City
|School||Fujian Normal University|
|Keywords||Headland Reservoir Changes in water quality Attribute recognition theory Eutrophication Assessment Releasing from Sediment|
The Headland Reservoir is one of the important freshwater resources in Fujian Province, Fuzhou second drinking water sources, its water quality is directly related to the the Fuzhou public health security. In recent years, due to domestic wastewater, wastewater, cage culture, pig, surface runoff, especially a lot of dissolved organic and inorganic nutrients (nitrogen, phosphorus) into the reservoir which caused the deterioration of water quality. Therefore, at the end of 2000, Fujian People's Government promulgated Aojiang River Water Source Protection Measures for the Administration of the reservoir water pollution governance. Short-term, water quality has been a certain improvement, but the ring library contamination closure for some time, but the deteriorating trend Eutrophication now Reservoir Sediments of nutrient elements in the release is one of the main cause eutrophication. Based on the above background and the data obtained, the paper analyzes the variation of reservoir eutrophication Headland, to discuss the underlying reasons that cause water quality eutrophication, focuses on the reservoir sediment nutrient release. This study attempts to Headland reservoir eutrophication control and governance provide the theoretical basis of the scientific decision-making, but also oriented Eutrophic Reservoir province to provide reference. Main findings of this thesis: 1, water quality data by comparing the the Headland reservoir decade, the following conclusions: ① for different water level of water quality is good in the wet and dry seasons, the wet period of the worst water quality; huokou worst water quality for different locations Second date Creek, small Cang, the dam water quality has improved, we can see, this situation has a direct relationship with the rainfall and coastal living in the reservoir area pollution sources. The ② chlorophyll a and PH, of COD Mn and algae in the total number of extremely significant relationship. ③ WQOs in the horizontal direction is gradually decreased along the flow direction. DO and pH decreasing trend along the depth, the bottom of the reservoir is anaerobic and weak acidic environment in the vertical direction, total nitrogen, total phosphorus in the mountains and beautiful park and dam front water depth direction is gradually increased. 2, using the attribute recognition theoretical model of the reservoir's water quality interannual month inter eutrophication evaluation results show that the 1997,1998,1999,2003 Headland reservoir belonging to the eutrophication level, 1996,2000,2001,2002 belongs - eutrophication level; within one year, three months 8,9,5 summary parts eutrophication highest 2,3,4,6 four months, followed by, 10,11,12,1 four months water quality to achieve the best levels of nutrition, the study further found that the different sources of pollution is closely related to eutrophication with the outside world. 3, laboratory, simulation at different temperatures (according to the change of seasons) sediment samples of mud water interface nutrient static release, The results showed that the average of total phosphorus apparent release rate of 1.996 mg / m, · d ( 15oC) and 2.873 mg / mZ · d (25oC). Release of ammonia apparent average speed of 47.09 mg / mZ · d (15oC) and 59.45 mg / m · d (25oC) and application of GIS and remote sensing images, topographic maps derived reservoir bottom topography and sediment release area The annual total phosphorus release to arrive for 4.slt / a, ammonia for 120.25t / a. The study also found that the sediment release strength is gradually increased along the flow direction.