CN110187072A - A kind of methods of water environment quality assessment based on exchange premium degree model - Google Patents
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Abstract
一种基于贴进度模型的水环境质量评价方法,涉及一种水环境质量评价的方法,本发明首次使用基于贴近度模型确定隶属度的水环境质量评价方法,并充分考虑了待评价地区水环境指标的现状,以水质达标情况为基础计算了各评价指标的权重。参考地表水环境质量标准(GB3838‑2002)中除pH、温度和溶解氧外的地表水环境质标准基本项目为评价指标,按照地表水环境质量标准将水环境质量分为5个等级,评价标准值选取地表水环境质量标准中的各指标的标准限值。该方法考虑评价指标的超标情况,综合考虑各待评价点位的水环境情况,同时该方法结构合理并且概念清楚、灵活简便,有益于进行推广。A water environment quality evaluation method based on a sticking schedule model relates to a water environment quality evaluation method. The present invention uses the water environment quality evaluation method based on the closeness model to determine the degree of membership for the first time, and fully considers the water environment in the area to be evaluated. Based on the status of the indicators, the weight of each evaluation indicator was calculated based on the water quality compliance. With reference to the basic items of the surface water environmental quality standard except pH, temperature and dissolved oxygen in the surface water environmental quality standard (GB3838‑2002) as evaluation indicators, the water environmental quality is divided into 5 grades according to the surface water environmental quality standard, and the evaluation standard The value selects the standard limit value of each index in the surface water environmental quality standard. This method considers the over-standard situation of the evaluation index, and comprehensively considers the water environment of each site to be evaluated. At the same time, the method has a reasonable structure, clear concept, flexibility and simplicity, which is beneficial to popularization.
Description
技术领域technical field
本发明涉及一种水环境质量评价方法,特别是涉及一种基于贴进度模型的水环境质量评价方法。The invention relates to a water environment quality evaluation method, in particular to a water environment quality evaluation method based on a sticking schedule model.
背景技术Background technique
水资源是人类生产和发展不可或缺的自然资源,在人们的日常生活中发挥着重要作用,而作为水资源重要组成部分的河流,其状况直接影响着居民的用水安全。但随着经济发展,人们对水需求量增长的同时,越来越多的工业、农业和生活废水被排放到河流中,使得水污染事件频发,水环境质量不断下降,甚至已经危害到人们的身体健康。因此,需要对水环境质量开展评价,以准确的评估水质状况及其污染程度,并在水环境质量评价的基础上开展对策和改善措施研究,为提高水环境质量和环境管理水平提供基础。Water resources are an indispensable natural resource for human production and development, and play an important role in people's daily life. As an important part of water resources, the status of rivers directly affects the water security of residents. However, with the development of the economy, people's demand for water has increased, and more and more industrial, agricultural and domestic waste water has been discharged into rivers, resulting in frequent occurrence of water pollution incidents, continuous decline in the quality of the water environment, and even harm to people. of physical health. Therefore, it is necessary to evaluate the water environment quality to accurately assess the water quality and its pollution degree, and to carry out research on countermeasures and improvement measures on the basis of the evaluation of water environment quality, so as to provide a basis for improving the water environment quality and environmental management level.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种基于贴进度模型的水环境质量评价方法,本发明是一种参考地表水环境质量标准(GB3838-2002)、考虑待评价地区水环境指标的现状、避免人为干扰因素的基于贴近度的科学评价水环境质量的评价方法。The purpose of the present invention is to provide a water environment quality assessment method based on the sticking schedule model. The present invention refers to the surface water environmental quality standard (GB3838-2002), considers the current situation of water environment indicators in the area to be assessed, and avoids human interference factors. The scientific evaluation method of water environmental quality based on closeness.
本发明的目的是通过以下技术方案实现的:The purpose of this invention is to realize through the following technical solutions:
一种基于贴进度模型的水环境质量评价方法,所述方法包括以地表水环境质量标准(GB3838-2002)中除pH、温度和溶解氧外的地表水环境质标准中21种基本项目为评价指标,并选取地表水环境质量标准(GB3838-2002)中各指标的标准限值为水环境质量评价指标体系的评价标准值,将地表水环境质量标准将水环境质量分为5个等级;以水质超标情况为基础构建指标权重,根据待评价地区实际情况选择比较的水质标准等级,以三级水质标准为例,超过三级水质标准的点位越多的评价指标的权重越大;A water environment quality evaluation method based on the sticking schedule model, the method includes taking 21 basic items in the surface water environmental quality standard (GB3838-2002) except pH, temperature and dissolved oxygen as the evaluation The standard limit of each index in the surface water environmental quality standard (GB3838-2002) is selected as the evaluation standard value of the water environment quality evaluation index system, and the surface water environmental quality standard is divided into 5 grades; The index weight is constructed based on the water quality exceeding the standard, and the water quality standard level for comparison is selected according to the actual situation of the area to be evaluated. Taking the third-level water quality standard as an example, the more points that exceed the third-level water quality standard, the greater the weight of the evaluation index;
具体步骤如下:Specific steps are as follows:
步骤一、评价指标体系的建立和评价标准的确定:Step 1. Establishment of evaluation index system and determination of evaluation criteria:
以地表水环境质量标准(GB3838-2002)中除pH、温度和溶解氧外的地表水环境质标准中21种基本项目为评价指标,并选取地表水环境质量标准(GB3838-2002)中各指标的标准限值为水环境质量评价指标体系的评价标准值,将地表水环境质量标准将水环境质量分为5个等级;Take the 21 basic items in the surface water environmental quality standard (GB3838-2002) except pH, temperature and dissolved oxygen as the evaluation indicators, and select the indicators in the surface water environmental quality standard (GB3838-2002) The standard limit is the evaluation standard value of the water environment quality evaluation index system, and the surface water environment quality standard divides the water environment quality into 5 grades;
步骤二、评价指标权重的确定:Step 2: Determine the weight of the evaluation index:
以水质超标情况为基础构建指标权重,根据待评价地区实际情况选择比较的水质标准等级;步骤三、使用基于贴进度模型的方法进行水环境质量评价:The index weight is constructed based on the water quality exceeding the standard, and the water quality standard grade for comparison is selected according to the actual situation of the area to be evaluated; Step 3, using the method based on the sticking progress model to evaluate the water environment quality:
(1)建立样本矩阵,构建虚拟的“最优点”或“最差点”;(1) Establish a sample matrix to construct a virtual "best point" or "worst point";
(2)建立样本矩阵R;(2) Establish a sample matrix R;
(4)计算各样本点距“最优点”、“最劣点”的距离;(4) Calculate the distance between each sample point and the "best point" and "worst point";
(5)计算各样本点与标准值点的贴近度;(5) Calculate the closeness of each sample point to the standard value point;
(6)水环境质量评价。(6) Evaluation of water environment quality.
所述的一种基于贴进度模型的水环境质量评价方法,所述步骤三中使用基于贴进度模型的方法进行水环境质量评价,计算各样本点距“最优点”、“最劣点”的距离,为计算各个样本点及标准值点与构建的最优点、最劣点之间的距离,再根据该结果计算出各样本点与标准值点的贴近度。In the water environment quality evaluation method based on the sticking schedule model, in the third step, the method based on the sticking schedule model is used to evaluate the water environment quality, and the distance between the "best point" and "the worst point" of each sample point is calculated. Distance, in order to calculate the distance between each sample point and standard value point and the constructed best point and worst point, and then calculate the closeness of each sample point and standard value point according to the result.
所述的一种基于贴进度模型的水环境质量评价方法,所述步骤三中使用基于贴进度模型的方法进行水环境质量评价,水环境质量评价,为确定评价点的水环境质量等级。In the water environment quality evaluation method based on the sticking schedule model, in the third step, the method based on the sticking schedule model is used to evaluate the water environment quality, and the water environment quality evaluation is to determine the water environment quality level of the evaluation point.
本发明的优点与效果是:The advantages and effects of the present invention are:
本发明首次使用基于贴近度模型确定隶属度的水环境质量评价方法,并充分考虑了待评价地区水环境指标的现状,以水质达标情况为基础计算了各评价指标的权重。本评价方法参考地表水环境质量标准(GB3838-2002),确定了评价指标体系和评价标准,评价体系完整科学。该方法考虑评价指标的超标情况,综合考虑各待评价点位的水环境情况,同时该方法结构合理的,并且概念清楚,灵活简便,可以进行推广。The invention uses the water environment quality evaluation method based on the closeness model to determine the membership degree for the first time, fully considers the current situation of the water environment indicators in the area to be evaluated, and calculates the weight of each evaluation indicator based on the water quality compliance. This evaluation method refers to the surface water environmental quality standard (GB3838-2002), determines the evaluation index system and evaluation standard, and the evaluation system is complete and scientific. This method considers the over-standard situation of the evaluation index, and comprehensively considers the water environment of each site to be evaluated. At the same time, the method has a reasonable structure, clear concept, flexible and simple, and can be popularized.
附图说明Description of drawings
图1为本发明的水环境质量评价方法流程图。Fig. 1 is a flow chart of the water environment quality evaluation method of the present invention.
具体实施方式Detailed ways
下面结合附图所示实施例对本发明进行详细说明。The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.
本发明的水环境质量评价方法包括下述步骤:The water environment quality evaluation method of the present invention comprises the following steps:
步骤一、评价指标体系的建立和评价标准的确定:Step 1. Establishment of evaluation index system and determination of evaluation criteria:
以地表水环境质量标准(GB3838-2002)中除pH、温度和溶解氧外的地表水环境质标准中21种基本项目为评价指标,并选取地表水环境质量标准(GB3838-2002)中各指标的标准限值为水环境质量评价指标体系的评价标准值,将地表水环境质量标准将水环境质量分为5个等级,水环境质量评价指标和各等级标准值见表1。Take the 21 basic items in the surface water environmental quality standard (GB3838-2002) except pH, temperature and dissolved oxygen as the evaluation indicators, and select the indicators in the surface water environmental quality standard (GB3838-2002) The standard limit is the evaluation standard value of the water environment quality evaluation index system. The surface water environment quality standard is divided into five grades. The water environment quality evaluation index and the standard value of each grade are shown in Table 1.
表1水环境质量评价指标和各等级标准值(mg/L)Table 1 Water environment quality evaluation index and standard value of each grade (mg/L)
步骤二、评价指标权重的确定:Step 2: Determine the weight of the evaluation index:
以水质超标情况为基础构建指标权重,根据待评价地区实际情况选择比较的水质标准等级。以三级水质标准为例,超过三级水质标准的点位越多的评价指标的权重越大。具体计算过程如下:首先统计各点位评价指标i的值超过三级标准值的个数,记为;其次,取,最后评价指标i的权重。The index weight is constructed based on the water quality exceeding the standard, and the water quality standard grade for comparison is selected according to the actual situation of the area to be evaluated. Taking the third-level water quality standard as an example, the more points that exceed the third-level water quality standard, the greater the weight of the evaluation index. The specific calculation process is as follows: First, count the number of points whose value of the evaluation index i exceeds the third-level standard value, which is recorded as ; secondly, take , the weight of the final evaluation index i .
步骤三、使用基于贴进度模型的方法进行水环境质量评价:Step 3. Use the method based on the sticking schedule model to evaluate the water environment quality:
(1)建立样本矩阵,构建虚拟的“最优点”或“最差点”(1) Establish a sample matrix and construct a virtual "best point" or "worst point"
假设水环境质量监测点位数为m-1,为监测点位,(m=1,2,3,4,5)为五级水环境质量等级的标准值点。Assuming that the number of water environmental quality monitoring points is m-1, for monitoring points, (m=1, 2, 3, 4, 5) is the standard value point of the five-level water environment quality level.
将m-1个监测点及一个标准值点的21个评价指标,构成初始矩阵:Will m-1 monitoring points and a standard value point 21 evaluation indicators of , forming the initial matrix :
其中是第i个监测点的第j个评价指标的量化值,i∈(1,2,…m-1),j∈(1,2,…,21),是标准值的第j个指标值。in is the ith monitoring point The quantized value of the jth evaluation index of , i ∈ (1, 2, ... m-1), j ∈ (1, 2, ..., 21), is the jth index value of the standard value.
(2)建立样本矩阵R(2) Establish a sample matrix R
令 make
将矩阵(1)进行归一化处理,建立样本矩阵R:Normalize the matrix (1) to establish a sample matrix R:
式中, 为待优化的样本点。In the formula, is the sample point to be optimized.
(3)构建最优点和最劣点(3) Build the best and worst points
本评价方法的评价指标为负向指标,即指标值越大,水质越差,因此,样本综合后的最优点应为各指标的最小值集合点,最劣点则为各指标的最大值集合点,即:The evaluation index of this evaluation method is a negative index, that is, the larger the index value, the worse the water quality. Therefore, the best point after sample synthesis should be the minimum value set point of each index, and the worst point should be the maximum value set of each index. point, i.e.:
最优点: Best point:
最劣点: Worst point:
构建的最优点、最劣点为待评价河流采样期,水环境质量极端状况(最好、最差)的虚拟点。The best part of the build , the worst point It is a virtual point for the extreme conditions (best and worst) of the water environment quality during the sampling period of the river to be evaluated.
(4)计算各样本点距“最优点”、“最劣点”的距离(4) Calculate the distance between each sample point and the "best point" and "worst point"
计算各个样本点及标准值点与构建的最优点、最劣点之间的距离,再根据该结果计算出各样本点与标准值点的贴近度。Calculate the distance between each sample point and standard value point and the constructed best and worst points, and then calculate the closeness of each sample point and standard value point according to the result.
第i个样本点与“最优点”的距离为:The distance between the i-th sample point and the "best point" is:
(4) (4)
第i个样本点与最差点的距离为:The distance between the i-th sample point and the worst point is:
(5) (5)
标准值点与“最优点”及“最差点”的距离为:The distance between the standard value point and the "best point" and "worst point" is:
(6) (6)
(7) (7)
式中为第j个指标(即第j个污染物因子)在整个水质评价中的权重。in the formula is the weight of the jth index (that is, the jth pollutant factor) in the whole water quality evaluation.
(5)计算各样本点与标准值点的贴近度(5) Calculate the closeness of each sample point to the standard value point
第i个样本点与标准值点m的贴近度为:The closeness of the i-th sample point to the standard value point m is:
(6)水环境质量评价(6) Evaluation of water environment quality
按照以上所述的方法,计算第i个样本点与五个评价等级标准值点的贴进度According to the method described above, calculate the sticking progress between the i-th sample point and the five evaluation grade standard value points
,定义第i个样本点与五个评价等级的隶属度为, , the membership degree of the i-th sample point and the five evaluation levels is defined as,
,即。取为最小值时,若则第i个样品点的水环境质量等级为此时的m,否则,该点的水环境质量等级为m-1;若为最小值时的m值为5,则该点的水环境质量等级直接为5级。 ,Right now . Pick is the minimum value, if Then the water environment quality level of the i-th sample point is m at this time, otherwise, the water environment quality level of this point is m-1; if When the m value is 5 when it is the minimum value, the water environment quality level of this point is directly level 5.
实施例1:Example 1:
以河流干流8个监测点位的水环境质量监测数据为基础,开展水环境质量评价。Based on the water environment quality monitoring data of 8 monitoring points in the mainstream of the river, the water environment quality assessment was carried out.
(1)指标体系的建立:(1) Establishment of the indicator system:
以地表水环境质量标准(GB3838-2002)中除pH、温度和溶解氧外的地表水环境质标准中21种基本项目为评价指标,并选取地表水环境质量标准(GB3838-2002)中各指标的标准限值为水环境质量评价指标体系的评价标准值,将地表水环境质量标准将水环境质量分为5个等级,水环境质量评价指标和各等级标准值见表1。Take the 21 basic items in the surface water environmental quality standard (GB3838-2002) except pH, temperature and dissolved oxygen as the evaluation indicators, and select the indicators in the surface water environmental quality standard (GB3838-2002) The standard limit is the evaluation standard value of the water environment quality evaluation index system. The surface water environment quality standard is divided into five grades. The water environment quality evaluation index and the standard value of each grade are shown in Table 1.
(2)评价指标权重的确定:(2) Determination of evaluation index weights:
根据河流污染情况,选择三级水质标准,超过三级水质标准的点位越多的评价指标的权重越大。具体计算过程如下:首先统计各点位评价指标i的值超过三级标准值的个数,记为;其次,取,最后评价指标i的权重。经过计算各指标的权重(高锰酸钾指数,化学需氧量,五日生化需氧量,氨氮,总磷,总氮,铜,锌,氟化物,硒,砷,汞,铬,铅,氰化物,挥发酚,石油类,阴离子表面活性剂,硫化物,粪大肠菌群)分别为0.0548,0.0822,0.1096,0.1233,0.0822,0.1233,0.0137,0.0137,0.0137,0.0137,0.0137,0.0137,0.0137,0.0137,0.0137,0.0137,0.0822,0.1233,0.0137,0.0137,0.0548。According to the river pollution situation, the three-level water quality standard is selected, and the more points that exceed the three-level water quality standard, the greater the weight of the evaluation index. The specific calculation process is as follows: First, count the number of points whose value of the evaluation index i exceeds the third-level standard value, which is recorded as ; secondly, take , the weight of the final evaluation index i . After calculating the weight of each index (potassium permanganate index, chemical oxygen demand, BOD 5, ammonia nitrogen, total phosphorus, total nitrogen, copper, zinc, fluoride, selenium, arsenic, mercury, chromium, lead, Cyanide, volatile phenol, petroleum, anionic surfactant, sulfide, fecal coliform) were 0.0548, 0.0822, 0.1096, 0.1233, 0.0822, 0.1233, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0137, 0.0822, 0.1233, 0.0137, 0.0137, 0.0548.
(3)使用基于贴进度模型的方法进行水环境质量评价:(3) Use the method based on the sticking schedule model to evaluate the water environment quality:
依据所述的水环境质量评价方法,以河流干流8个监测点位的21项监测指标的监测数据和5个水环境质量等级的标准值点为基础,构建初始矩阵,计算出涉及不同水环境质量等级的样本矩阵R,虚拟出涉及不同水环境质量等级的“最优点”或“最差点”,根据公式(4)、公式(5)计算各个监测样点距“最优点”、“最劣点”的距离。计算结果如下:对于1级水环境质量标准,各监测点位对于最优点的距离依次为0.1871、0.3567、0.1763、0.1912、0.1996、0.2642、0.2825和0.1998,对于最劣点的距离为0.3347、0.2686、0.3304、0.3149、0.2999、0.2787、0.2640和0.3243;对于2级水环境质量标准,各监测点位对于最优点的距离依次为0.1590、0.3287、0.1494、0.1660、0.1768、0.2429、0.2584和0.1708,对于最劣点的距离为0.4041、0.3489、0.3981、0.3878、0.3746、0.3552、0.3426和0.3906;对于3级水环境质量标准,各监测点位对于最优点的距离依次为0.1330、0.2911、0.1200、0.1478、0.1513、0.2230、0.2357和0.1490,对于最劣点的距离为0.4226、0.3717、0.4169、0.4058、0.3943、0.3779、0.3663和0.4106;对于4级水环境质量标准,各监测点位对于最优点的距离依次为0.1176、0.2657、0.1055、0.1138、0.1261、0.1850、0.2012和0.1172,对于最劣点的距离为0.4716、0.4282、0.4666、0.4478、0.4422、0.4195、0.4129和0.4535;对于5级水环境质量标准,各监测点位对于最优点的距离依次为0.0992、0.2378、0.0948、0.0915、0.1059、0.1522、0.1691和0.0850,对于最劣点的距离为0.5907、0.5539、0.5869、0.5713、0.5671、0.5434、0.5377和0.5777。According to the water environment quality assessment method, the initial matrix was constructed based on the monitoring data of 21 monitoring indicators at 8 monitoring points in the main river and the standard value points of 5 water environment quality grades. , calculate the sample matrix R involving different water environmental quality levels, and virtualize the "best point" or "worst point" involving different water environmental quality levels, and calculate the distance between each monitoring sample point according to formula (4) and formula (5). The distance between the best point" and the "worst point". The calculation results are as follows: for the first-level water environment quality standard, the distances of each monitoring point to the best point are 0.1871, 0.3567, 0.1763, 0.1912, 0.1996, 0.2642, 0.2825 and 0.1998, and the distances to the worst point are 0.3347, 0.2686, 0.3304, 0.3149, 0.2999, 0.2787, 0.2640 and 0.3243; for the second-level water environment quality standard, the distances of each monitoring point to the best point are 0.1590, 0.3287, 0.1494, 0.1660, 0.1768, 0.2429, 0.2584 and 0.1708. For the worst The distances of the points are 0.4041, 0.3489, 0.3981, 0.3878, 0.3746, 0.3552, 0.3426 and 0.3906; for the 3-level water environment quality standard, the distances of each monitoring point to the best point are 0.1330, 0.2911, 0.1200, 0.1478, 0.1513, and 0.2230. , 0.2357 and 0.1490, the distances to the worst point are 0.4226, 0.3717, 0.4169, 0.4058, 0.3943, 0.3779, 0.3663 and 0.4106; for the 4-level water environment quality standard, the distances of each monitoring point to the best point are 0.1176, 0.2657 , 0.1055, 0.1138, 0.1261, 0.1850, 0.2012 and 0.1172, the distances for the worst point are 0.4716, 0.4282, 0.4666, 0.4478, 0.4422, 0.4195, 0.4129 and 0.4535; The distances for the advantage are 0.0992, 0.2378, 0.0948, 0.0915, 0.1059, 0.1522, 0.1691 and 0.0850, and the distances for the worst point are 0.5907, 0.5539, 0.5869, 0.5713, 0.5671, 0.5434, 0.5377 and 0.5777.
根据公式(6)、公式(7)和公式(8)计算第i个样本点与五个评价等级标准值点的贴进度According to formula (6), formula (7) and formula (8), calculate the sticking progress of the i-th sample point and the five evaluation grade standard value points
,定义第i个样本点与五个评价等级的隶属度为,,即。按照上述方法计算河流干流8个监测点位的对于5个水环境质量标准的贴进度。计算结果为,监测点位1对于5个水环境质量标准隶属度为{0.0058,0.5672,1.0261,2.1771,3.8732},监测点位2的隶属度为{-0.3541,-0.0289,0.2232,0.9706,2.0085},监测点位3的隶属度为{0.0357,0.6236,1.1599,2.3899,3.9997},监测点位4的隶属度为{-0.0319,0.5021,0.8655,2.1813,4.0650},监测点位5的隶属度为{-0.0749,0.4251,0.8187,1.9688,3.6073},监测点位6的隶属度为{-0.2347,0.1518,0.4178,1.3278,2.6782},监测点位7的隶属度为{-0.2800,0.0949,0.3561,1.2099,2.4659},监测点位8的隶属度为{-0.0443,0.4794,0.8634,2.1381,4.3330}。若为最小值时,若则第i个样品点的水环境质量等级为此时的m,否则,该点的水环境质量等级为m-1;若为最小值时的m值为5,则该点的水环境质量等级直接为5级。因此监测点位1、3的水环境质量为1级,监测点位2的水环境质量为3级,监测点位4、5、6、7、8的水环境质量为2级。 , the membership degree of the i-th sample point and the five evaluation levels is defined as, ,Right now . According to the above method, the progress of 5 water environment quality standards for 8 monitoring points in the mainstream of the river was calculated. The calculation result is that the membership degrees of monitoring point 1 for the five water environment quality standards are {0.0058, 0.5672, 1.0261, 2.1771, 3.8732}, and the membership degrees of monitoring point 2 are {-0.3541, -0.0289, 0.2232, 0.9706, 2.0085 }, the membership degree of monitoring point 3 is {0.0357, 0.6236, 1.1599, 2.3899, 3.9997}, the membership degree of monitoring point 4 is {-0.0319, 0.5021, 0.8655, 2.1813, 4.0650}, the membership degree of monitoring point 5 is {-0.0749, 0.4251, 0.8187, 1.9688, 3.6073}, the membership degree of monitoring point 6 is {-0.2347, 0.1518, 0.4178, 1.3278, 2.6782}, the membership degree of monitoring point 7 is {-0.2800, 0.0949, 0.3561 , 1.2099, 2.4659}, the membership degree of monitoring point 8 is {-0.0443, 0.4794, 0.8634, 2.1381, 4.3330}. like is the minimum value, if Then the water environment quality level of the i-th sample point is m at this time, otherwise, the water environment quality level of this point is m-1; if If the m value is 5 when it is the minimum value, the water environment quality level at this point is directly level 5. Therefore, the water environment quality of monitoring points 1 and 3 is grade 1, that of monitoring point 2 is grade 3, and that of monitoring points 4, 5, 6, 7, and 8 is grade 2.
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