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| Research and application of characterisation using background value method for surface waters in special areas |
| DUAN Mao-qing1,2, DU Xia2, PENG Wen-qi2, ZHANG Shi-jie2, JIANG Cui-ling3, YAN Lin-qing2, DING Yang2 |
1. Center of Eco-environmental Monitoring and Scientific Research, Administration of Ecology and Environment of HaiheRiver Basin and Beihai Sea Area, Ministry of Ecology and Environmentof People's Republic of China, Tianjin 300170;
2. Department of Water Ecology and Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
3. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China |
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Abstract Taking into consideration the problems caused by insufficient representation of water quality monitoring stations in previous research methods, a system of research methods suitable for surface-water background values in Northeast China was established, considering the spatiotemporal characteristics of water background values. Source water reserves in Heilongjiang Province was selected as the study area, water quality monitoring stations set up randomly in the area were divided into control units according to DEM data, and a model to quantitatively determine the background characteristics of these stations was established by extracting the relevant indicators in each unit. Based on the results, a surface-water background value monitoring program was proposed, and a database of the background values was developed. The study area's natural and spatial attributes were selected and spatial overlay technology and cluster analysis method were used to divide its surface-water background values, based on which Heilongjiang Province was eventually divided into six geographical areas. Furthermore, the characteristic range of surface water background values of each geographic area was calculated and it was found that the surface-water background values in the protected area exceeded the standard limit of Class Ⅱ water quality. Finally, a method for assessing the water quality using the background values was proposed and applied to the study area. The results show that the method is feasible and superior to the single-factor assessment method. The research results can provide scientific data support and theoretical basis for regions to develop water environment assessment methods under the influence of background values.
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Received: 27 February 2020
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