摘要
为了探讨倍斜率聚类法在湿地旅游景区水环境质量评价中的应用,构建了包括聚类指标溶解氧(DO)等在内的宽域式倍斜率聚类隶属函数,测量了南沙湿地公园和附近6个采样点的水体温度、pH值、DO、BOD5、COD、TP和NH+4等物化指标。结果表明,南沙湿地公园水域整体处于"尚清洁"状态,内部3个采样点均为Ⅱ级水质标准,但与外围的2个采样点的Ⅰ级水质标准相比,水质稍有下降。外围的另外1个采样点虽也处于Ⅱ级,但已接近Ⅲ级水平,在6个采样点中水质最差。评价结果与南沙湿地公园的实际较为接近,表明用倍斜率聚类法能较好地评价湿地旅游景区的水环境质量。
This paper aims to introduce a water environmental quality assessment approach to the wetland tourist areas based on the twice- sloping clustering method. For our research purpose, we have con- structed a more wide twice-sloping clustering membership functions, including the clustering indexes, the physicochemieal indexes of the six sampling sites, such as the water temperature, the pH value, DO, BOD5, COD, TP and NH4＋ - N. （the dissolved oxygen （DO） etc. The six sampling sites are all in the Nansha Wetland Park and the nearby areas. As to the twice-sloping clustering method, it enjoys some specific features, such as better keeping information and fully reflecting the effects of the main pollutants, though it had seldom been used before. In order to make the evaluation results more accu- rate, we have divided the quality standards for water environment into 6 levels in our paper. In addition, we have added the absolute value sign to one of the items of the h - 1 expressions to prevent the calcu- lation results of the dissolved oxygen （DO） twice-slope membership functions from being beyond the upper limit value 1. Thus, the final evaluation results gained by using the method can be stated as fol- lows： the water quality of the three sampling points in Nansha Park and the other three sampling points nearby the park belong to ＂the rather clean level＂. But, as compared with the above sampling points, their water quality is worse, or slightly drops. That is to say, the water quality of these points in the park belong to the second lev- el, whereas the water quality of the nearby two sampling points out- side the park belong to the first level. Still another sampling point outside the park was found poor in water quality and can be put into level two or near to level three. Therefore, according to the criteria of the clustering coefficients, it should be regarded as the worst one in the six sampling points for its water quality. From the above evalua- tion results, it can be seen that all the results
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第1期238-241,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(41271060)
广东省自然科学基金项目(8151063101000016)
关键词
环境学
水环境质量评价
倍斜率聚类法
湿地旅游景区
广州南沙湿地公园
environmentology
water environmental quality assess-ment
twice-slope clustering method
wetland touristarea
Guangzhou Nansha Wetland Park
