生态环境学报 ›› 2023, Vol. 32 ›› Issue (2): 372-380.DOI: 10.16258/j.cnki.1674-5906.2023.02.017
收稿日期:
2022-06-20
出版日期:
2023-02-18
发布日期:
2023-05-11
通讯作者:
*作者简介:
程鹏(1989年生),男,副教授,博士研究生,主要研究方向为流域水环境管理。E-mail: pengcheng@sxufe.edu.cn
基金资助:
CHENG Peng1,*(), SUN Mingdong2, HAO Shaonan3
Received:
2022-06-20
Online:
2023-02-18
Published:
2023-05-11
摘要:
河流水质评价对流域水环境管理具有重要意义。由于具有较强的综合性和可比性,水质综合评价指数(WQI)已成为国内外河流水质评价的主流方法,然而因其需要大量的水质参数,需要耗费大量的物力和财力。采用2018年官厅水库上游河流37个监测点的月度监测数据,运用全子集回归模型分训练和验证两个环节建立了对水质参数数量要求较少的适用于官厅水库上游河流水质评价的最简水质综合评价指数(WQImin),并采用建立的WQImin对官厅水库上游河流水质进行了时空分布特征分析。结果显示:在训练环节,水质参数的数量越多,WQImin的训练效果越好,并且考虑水质参数相对权重的模型效果要优于不考虑相对权重的模型。综合考虑水质评价的准确性和易用性,采用CODMn、DO和TN等3个水质参数,且考虑水质参数权重的最简水质综合评价指数模型(WQImin-b3)是训练环节官厅水库上游流域最佳的WQImin模型。在验证环节,WQImin-b3与WQI有较好的线性关系,证实了建立的WQImin-b3模型可代替WQI模型进行官厅水库上游河流水质评价。官厅水库上游河流水质在秋季最好,夏季次之;由于受到融雪期非点源污染的影响,春季官厅水库上游河流水质最差,因而官厅水库上游流域应对融雪期非点源污染给予充分重视。官厅水库上游各河段WQImin平均值的最高值出现在清水河,其次是南洋河;桑干河上游由于工业废水和生活污水的大量排放,其水质状态最差。该研究可为官厅水库上游及其他流域河流水质管理提供科学参考。
中图分类号:
程鹏, 孙明东, 郝韶楠. 基于最简水质综合评价指数的官厅水库上游河流水质评价[J]. 生态环境学报, 2023, 32(2): 372-380.
CHENG Peng, SUN Mingdong, HAO Shaonan. Water Quality Assessment of Upstream Rivers of Guanting Reservoir Based on the Simplest Water Quality Index[J]. Ecology and Environment, 2023, 32(2): 372-380.
水质参数 | 相对权重 (P) | 标准化因子 (Ci) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
100 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 | ||
t/℃ | 1 | 16-21 | 15-16, 21-22 | 14-15, 22-24 | 12-14, 24-26 | 10-12, 26-28 | 5-10, 28-30 | 0-5, 30-32 | -2-0, 32-36 | -4- -2, 36-40 | -6- -4, 36-40 | <-6, >45 |
pH | 1 | 7 | 7-8 | 8-8.5 | 8.5-9 | 6.5-7 | 6-6.5, 9-9.5 | 5-6, 9.5-10 | 4-5, 10-11 | 3-4, 11-12 | 2-3, 12-13 | 1-2, 13-14 |
Tur/NTU | 2 | <5 | <10 | <15 | <20 | <25 | <30 | <40 | <60 | <80 | ≤100 | >100 |
ρ(DO)/(mg·L-1) | 4 | ≥7.5 | >7 | >6.5 | >6 | >5 | >4 | >3.5 | >3 | >2 | ≥1 | <1 |
ρ(TN)/(mg·L-1) | 2 | <0.1 | <0.2 | <0.35 | <0.5 | <0.75 | <1 | <1.25 | <1.5 | <1.75 | ≤2 | >2 |
ρ(NH4-N)/(mg·L-1) | 3 | <0.01 | <0.05 | <0.1 | <0.2 | <0.3 | <0.4 | <0.5 | <0.75 | <1 | ≤1.25 | >1.25 |
ρ(TP)/(mg·L-1) | 1 | <0.01 | <0.02 | <0.05 | <0.1 | <0.15 | <0.2 | <0.25 | <0.3 | <0.35 | ≤0.4 | >0.4 |
ρ(CODMn)/(mg·L-1) | 3 | <1 | <2 | <3 | <4 | <6 | <8 | <10 | <12 | <14 | ≤15 | >15 |
ρ(BOD5)/(mg·L-1) | 3 | <0.5 | <2 | <3 | <4 | <5 | <6 | <8 | <10 | <12 | ≤15 | >15 |
表1 WQI及WQImin核算中各水质参数的权重和标准化因子
Table 1 Weights and normalization factors of the parameters used in the calculation of the WQI and WQImin
水质参数 | 相对权重 (P) | 标准化因子 (Ci) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
100 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 | ||
t/℃ | 1 | 16-21 | 15-16, 21-22 | 14-15, 22-24 | 12-14, 24-26 | 10-12, 26-28 | 5-10, 28-30 | 0-5, 30-32 | -2-0, 32-36 | -4- -2, 36-40 | -6- -4, 36-40 | <-6, >45 |
pH | 1 | 7 | 7-8 | 8-8.5 | 8.5-9 | 6.5-7 | 6-6.5, 9-9.5 | 5-6, 9.5-10 | 4-5, 10-11 | 3-4, 11-12 | 2-3, 12-13 | 1-2, 13-14 |
Tur/NTU | 2 | <5 | <10 | <15 | <20 | <25 | <30 | <40 | <60 | <80 | ≤100 | >100 |
ρ(DO)/(mg·L-1) | 4 | ≥7.5 | >7 | >6.5 | >6 | >5 | >4 | >3.5 | >3 | >2 | ≥1 | <1 |
ρ(TN)/(mg·L-1) | 2 | <0.1 | <0.2 | <0.35 | <0.5 | <0.75 | <1 | <1.25 | <1.5 | <1.75 | ≤2 | >2 |
ρ(NH4-N)/(mg·L-1) | 3 | <0.01 | <0.05 | <0.1 | <0.2 | <0.3 | <0.4 | <0.5 | <0.75 | <1 | ≤1.25 | >1.25 |
ρ(TP)/(mg·L-1) | 1 | <0.01 | <0.02 | <0.05 | <0.1 | <0.15 | <0.2 | <0.25 | <0.3 | <0.35 | ≤0.4 | >0.4 |
ρ(CODMn)/(mg·L-1) | 3 | <1 | <2 | <3 | <4 | <6 | <8 | <10 | <12 | <14 | ≤15 | >15 |
ρ(BOD5)/(mg·L-1) | 3 | <0.5 | <2 | <3 | <4 | <5 | <6 | <8 | <10 | <12 | ≤15 | >15 |
河段 | 水质参数 | ||||||||
---|---|---|---|---|---|---|---|---|---|
t/℃ | pH | Tur/NTU | ρ(DO)/(mg·L-1) | ρ(TN)/(mg·L-1) | ρ(NH4-N)/(mg·L-1) | ρ(TP)/(mg·L-1) | ρ(CODMn)/(mg·L-1) | ρ(BOD5)/(mg·L-1) | |
DY | 19.90±3.51 | 8.61±0.14 | 1010.82±1599.55 | 8.46±1.40 | 2.52±1.12 | 0.12±0.08 | 0.07±0.05 | 1.89±0.66 | 0.53±0.40 |
NY | 19.63±3.53 | 8.70±0.24 | 943.74±1495.72 | 8.88±1.57 | 4.75±2.41 | 0.28±0.53 | 0.10±0.09 | 2.54±0.89 | 0.59±0.52 |
YS | 18.74±4.40 | 8.72±0.30 | 714.60±1260.35 | 8.56±1.56 | 6.46±5.92 | 1.59±4.01 | 0.27±0.40 | 4.38±2.06 | 2.01±2.73 |
QS | 16.37±5.23 | 8.79±0.33 | 647.30±1311.38 | 9.40±2.52 | 7.78±3.20 | 0.32±0.46 | 0.12±0.13 | 3.21±2.21 | 1.60±3.14 |
YX | 20.30±4.98 | 8.67±0.41 | 46.08±49.27 | 9.81±4.85 | 7.61±4.99 | 0.43±0.79 | 0.28±0.39 | 5.96±4.03 | 2.71±2.18 |
SGS | 18.29±5.14 | 8.77±0.44 | 255.72±584.04 | 11.39±6.76 | 10.93±7.29 | 3.99±6.34 | 1.10±1.15 | 14.86±10.00 | 12.65±22.67 |
HL | 19.15±5.37 | 8.16±0.72 | 62.57±73.78 | 9.88±6.03 | 4.99±3.54 | 2.48±4.34 | 0.36±0.48 | 7.19±4.53 | 4.88±8.40 |
SGX | 18.39±4.10 | 8.74±0.35 | 57.03±75.61 | 9.65±4.21 | 6.96±3.46 | 0.26±0.27 | 0.17±0.20 | 11.45±18.95 | 6.65±11.75 |
YD | 20.97±4.59 | 8.60±0.29 | 17.57±9.98 | 8.91±1.64 | 6.38±2.36 | 0.22±0.11 | 0.17±0.14 | 4.08±0.83 | 1.88±0.85 |
GS | 19.80±4.35 | 8.71± 0.45 | 60.29 ±39.59 | 6.81 ±1.82 | 3.33 ±3.16 | 0.19 ±0.17 | 0.28 ±0.23 | 5.08 ±3.24 | 1.78 ±1.91 |
表2 官厅水库上游河流水质现状
Table 2 Current status of river water quality in the upstream basin of Guanting Reservoir
河段 | 水质参数 | ||||||||
---|---|---|---|---|---|---|---|---|---|
t/℃ | pH | Tur/NTU | ρ(DO)/(mg·L-1) | ρ(TN)/(mg·L-1) | ρ(NH4-N)/(mg·L-1) | ρ(TP)/(mg·L-1) | ρ(CODMn)/(mg·L-1) | ρ(BOD5)/(mg·L-1) | |
DY | 19.90±3.51 | 8.61±0.14 | 1010.82±1599.55 | 8.46±1.40 | 2.52±1.12 | 0.12±0.08 | 0.07±0.05 | 1.89±0.66 | 0.53±0.40 |
NY | 19.63±3.53 | 8.70±0.24 | 943.74±1495.72 | 8.88±1.57 | 4.75±2.41 | 0.28±0.53 | 0.10±0.09 | 2.54±0.89 | 0.59±0.52 |
YS | 18.74±4.40 | 8.72±0.30 | 714.60±1260.35 | 8.56±1.56 | 6.46±5.92 | 1.59±4.01 | 0.27±0.40 | 4.38±2.06 | 2.01±2.73 |
QS | 16.37±5.23 | 8.79±0.33 | 647.30±1311.38 | 9.40±2.52 | 7.78±3.20 | 0.32±0.46 | 0.12±0.13 | 3.21±2.21 | 1.60±3.14 |
YX | 20.30±4.98 | 8.67±0.41 | 46.08±49.27 | 9.81±4.85 | 7.61±4.99 | 0.43±0.79 | 0.28±0.39 | 5.96±4.03 | 2.71±2.18 |
SGS | 18.29±5.14 | 8.77±0.44 | 255.72±584.04 | 11.39±6.76 | 10.93±7.29 | 3.99±6.34 | 1.10±1.15 | 14.86±10.00 | 12.65±22.67 |
HL | 19.15±5.37 | 8.16±0.72 | 62.57±73.78 | 9.88±6.03 | 4.99±3.54 | 2.48±4.34 | 0.36±0.48 | 7.19±4.53 | 4.88±8.40 |
SGX | 18.39±4.10 | 8.74±0.35 | 57.03±75.61 | 9.65±4.21 | 6.96±3.46 | 0.26±0.27 | 0.17±0.20 | 11.45±18.95 | 6.65±11.75 |
YD | 20.97±4.59 | 8.60±0.29 | 17.57±9.98 | 8.91±1.64 | 6.38±2.36 | 0.22±0.11 | 0.17±0.14 | 4.08±0.83 | 1.88±0.85 |
GS | 19.80±4.35 | 8.71± 0.45 | 60.29 ±39.59 | 6.81 ±1.82 | 3.33 ±3.16 | 0.19 ±0.17 | 0.28 ±0.23 | 5.08 ±3.24 | 1.78 ±1.91 |
序号 | 线性模型 | Adjusted R2 | P |
---|---|---|---|
1 | 1.357+0.221*lg(p9+1) | 0.600 | <0.001 |
2 | 1.092+0.164*lg(p8+1)+0.204*lg(p4+1) | 0.801 | <0.001 |
3 | 1.092+0.162*lg(p8+1)+0.203*lg(p4+1)+ 0.019lg*(p5+1) | 0.807 | <0.001 |
4 | 1.022+0.200*lg(p4+1)+0.108*lg(p9+1)+0.011*lg(p3+1)+0.097*lg(p6+1) | 0.888 | <0.001 |
5 | 1.027+0.075*lg(p8+1)+0.184*lg(p4+1)+0.078*lg(p9+1)+0.006*lg(p5+1)+0.073*lg(p6+1) | 0.924 | <0.001 |
6 | 0.921+0.054*lg(p2+1)+0.071*lg(p8+1)+0.185*lg(p4+1)+0.077*lg(p9+1)+ 0.007*lg(p5+1)+0.074*lg(p6+1) | 0.925 | <0.001 |
7 | 0.925+0.060*lg(p1+1)+0.056*lg(p8+1)+0.175*lg(p4+1)+0.084*lg(p9+1)+0.030*lg(p7+1)+0.005*lg(p5+1)+0.056*lg(p6+1) | 0.934 | <0.001 |
8 | 0.686+0.057*lg(p1+1)+0.134*lg(p2+1)+0.049*lg(p8+1)+0.179*lg(p4+1)+0.079*lg(p9+1)+0.035*lg(p7+1)+0.005*lg(p5+1)+ 0.057*lg(p6+1) | 0.937 | <0.001 |
表3 根据训练数据集得到的包含不同数量水质参数的解释WQI的线性模型
Table 3 Linear models explaining the WQI based on the training data set
序号 | 线性模型 | Adjusted R2 | P |
---|---|---|---|
1 | 1.357+0.221*lg(p9+1) | 0.600 | <0.001 |
2 | 1.092+0.164*lg(p8+1)+0.204*lg(p4+1) | 0.801 | <0.001 |
3 | 1.092+0.162*lg(p8+1)+0.203*lg(p4+1)+ 0.019lg*(p5+1) | 0.807 | <0.001 |
4 | 1.022+0.200*lg(p4+1)+0.108*lg(p9+1)+0.011*lg(p3+1)+0.097*lg(p6+1) | 0.888 | <0.001 |
5 | 1.027+0.075*lg(p8+1)+0.184*lg(p4+1)+0.078*lg(p9+1)+0.006*lg(p5+1)+0.073*lg(p6+1) | 0.924 | <0.001 |
6 | 0.921+0.054*lg(p2+1)+0.071*lg(p8+1)+0.185*lg(p4+1)+0.077*lg(p9+1)+ 0.007*lg(p5+1)+0.074*lg(p6+1) | 0.925 | <0.001 |
7 | 0.925+0.060*lg(p1+1)+0.056*lg(p8+1)+0.175*lg(p4+1)+0.084*lg(p9+1)+0.030*lg(p7+1)+0.005*lg(p5+1)+0.056*lg(p6+1) | 0.934 | <0.001 |
8 | 0.686+0.057*lg(p1+1)+0.134*lg(p2+1)+0.049*lg(p8+1)+0.179*lg(p4+1)+0.079*lg(p9+1)+0.035*lg(p7+1)+0.005*lg(p5+1)+ 0.057*lg(p6+1) | 0.937 | <0.001 |
水质参数 | WQImin-a | WQImin-b | |||||
---|---|---|---|---|---|---|---|
模型 | Adjusted R2 | P | 模型 | Adjusted R2 | P | ||
CODMn, DO | a2 | 0.715 | <0.001 | b2 | 0.744 | <0.001 | |
CODMn, DO, TN | a3 | 0.734 | <0.001 | b3 | 0.803 | <0.001 | |
DO, BOD5, Tur, NH4-N | a4 | 0.892 | <0.001 | b4 | 0.909 | <0.001 | |
CODMn, DO, BOD5, TN, NH4-N | a5 | 0.903 | <0.001 | b5 | 0.922 | <0.001 |
表4 根据训练数据集得到的解释WQI的线性模型
Table 4 Linear models explaining WQI based on the training data set
水质参数 | WQImin-a | WQImin-b | |||||
---|---|---|---|---|---|---|---|
模型 | Adjusted R2 | P | 模型 | Adjusted R2 | P | ||
CODMn, DO | a2 | 0.715 | <0.001 | b2 | 0.744 | <0.001 | |
CODMn, DO, TN | a3 | 0.734 | <0.001 | b3 | 0.803 | <0.001 | |
DO, BOD5, Tur, NH4-N | a4 | 0.892 | <0.001 | b4 | 0.909 | <0.001 | |
CODMn, DO, BOD5, TN, NH4-N | a5 | 0.903 | <0.001 | b5 | 0.922 | <0.001 |
图3 官厅水库上游河流WQImin-a3、WQImin-b3与WQI的验证关系 蓝线、红线分别是95%置信区间的上下限
Figure 3 Relationship between WQI and WQImin-a3 and WQImin-b3 based on the testing data sets
图4 官厅水库上游河流最简水质综合评价指数的季节性变化和空间变化 DY-东洋河;NY-南洋河;YS-洋河上游;QS-清水河;YX-洋河下游;SGS-桑干河上游;HL-壶流河;SGX-桑干河下游;YD-永定河;GS-妫水河
Figure 4 Seasonal variation and spatial variation of WQImin values in the upstream basin of Guanting Reservoir and tributaries
季节 | 水质分级 | ||||
---|---|---|---|---|---|
优秀 | 好 | 中等 | 差 | 极差 | |
春季 | 0 | 0 | 3/37 (8.1%) | 22/37 (59.5%) | 12/37 (32.4%) |
夏季 | 0 | 4/37 (10.8%) | 25/37 (67.6%) | 6/37 (16.2%) | 2/37 (5.4%) |
秋季 | 0 | 8/37 (21.6%) | 25/37 (67.6%) | 4/37 (10.8%) | 0 |
全部季节 | 0 | 12/111 (10.8%) | 53/111 (47.7%) | 32/111 (28.8%) | 14/111 (12.6%) |
表5 官厅水库上游河流不同水质分级所占比例
Table 5 The proportions of different water quality grades in the upstream of Guanting Reservoir
季节 | 水质分级 | ||||
---|---|---|---|---|---|
优秀 | 好 | 中等 | 差 | 极差 | |
春季 | 0 | 0 | 3/37 (8.1%) | 22/37 (59.5%) | 12/37 (32.4%) |
夏季 | 0 | 4/37 (10.8%) | 25/37 (67.6%) | 6/37 (16.2%) | 2/37 (5.4%) |
秋季 | 0 | 8/37 (21.6%) | 25/37 (67.6%) | 4/37 (10.8%) | 0 |
全部季节 | 0 | 12/111 (10.8%) | 53/111 (47.7%) | 32/111 (28.8%) | 14/111 (12.6%) |
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