Research And Application On Black And Odorous Water Body By Remote Sensing

According to the city water hot issues of malodorous black water quality monitoring is the problem of GF-1 PMS(2/8m)and GF-2 PMS(1/4m)model of black odor water discriminant image data,through the analysis of remote sensing reflectance curve characteristics,choose a variety of band combination model,finally through the model the classification accuracy of choosing the most suitable black smelly water discriminant model;discriminant model of the black odor water threshold screening,find the black and odorous water can be used to distinguish the universality of the threshold,the measured water quality parameters and multi period image verification,are to meet the classification accuracy requirements;analysis method using correlation,qualitative analysis the relationship between water quality parameters and evaluation index of malodorous black smelly water standard,before finding a linear relationship between the quality of black odor degree and black odor index Based on the above conclusions,the spatial distribution and change trend of black and odorous water in each period of 2013-2017 in the study area were analyzed.In view of the characteristics of black odor River-River narrow and small area,so in accordance with the requirements of remote sensing images must also have high resolution,PMS sensor GF-1 and GF-2 has high resolution,convenient data acquisition,image data can be used as an important source of black odor water identification.Based on the analysis of typical high-resolution images of black and odorous water and general water spectral characteristics,the band combination of black and odorous water and increase the difference of the general body,constructed the black odor water discriminant model.The classification accuracy of the model is verified by using the quasi synchronous field measured water quality data,and the classification accuracy is above 90%.In order to verify the discriminant model can be extended,the classification of water type in the study area using multiple images,and the measured data in the field verification,to meet the classification accuracy requirements,the model of threshold selection scope for the related research,found that black smelly water and water threshold is about 0.85.By using the method of analyzing the correlation of the black odor water index were made correlation analysis of dissolved oxygen and ammonia,redox potential,and were significant at the 0.01 level,the correlation coefficients were-0.82635,0.720542 and-0.63394,with the index of black odor water increasing,the degree of malodorous black smelly water is more and more high.Spatial distribution and change trend of Chaoyang District and Tongzhou District model 2013 to 2017 in Beijing City,the black and odorous water use of black and foul water,water pollution in Tongzhou District than in Chaoyang District,the study area black smelly water area and length increased year by year,to 2016 reached the maximum after dredging governance subsequently carried out on 2017 in the area of black and odorous water area and the number of dropped.