The Characteristics of Spatial Distribution of the Agricultural Drainage and Pollutions into Bosten Lake
Abstract: Bosten Lake was once China’s largest inland freshwater lake. Also, it is the important water source for the Yanqi Basin, the banks of Qongquehe, and the Tarim River. Since the 1950’s, the develop-ment of industry and agriculture has caused not only increased pollution into the lake, but also the water quality has deteriorated. Farmland drainage is the main cause for the water pollution. To quantitatively analyze the farmland drainage pollution, data were gathered for the characteristics of spatial distribution and for the annual changes in recent years. The following items below were used for obtaining these data: First, there is the basis of the remote sensing images and the field survey, where we represent the GIS’s plotting for the 26 main drainage canals. Secondly, by using the monitoring data of the drainage water into the lake during the period of June 2002 to May 2003, we can approximately estimate the increased amounts of wastewater and pollutants. Then lastly, we will use the results of the eight most important canals to be compared with the data for the year 2007. The criteria set above helped produce the following information: 1) The total drainage volume of wastewater, TN, and TP content of 26 main drainage canals was 4.3 × 108 m3, 1287 t and 10 t respectively; 2) For the 17 drainage canals into the Lake, the Yellow Main Dry Line had the largest total drainage volume of wastewater and TP content, 1.35 × 108 m3 and 4.3 t respectively; while the largest TN content was at the 22nd South Dry Line, 296t; 3) The grades of water quality for all of the drainage canals have now been classified and then arranged by the single factor index method and by the concentration of the pollutants; 4) Among all the drainages, we have selected eight most important canals whose total drainage volume of wastewater, TN, and TP content were respectively 3.6 × 108 m3, 1193 t and 9.6 t. Therefore, by comparing the data obtained from the year 2007 with those obtained from the period of June 2002 to May 2003, we have found that the percentage increase of wastewater, TN, and TP content was respectively 81.4%, 46.0% and 527.7%.
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