基于LOADEST模型和小波变换的河流氮磷污染动态分析

doi:10.3969/j.issn.1004-1524.2020.09.18

浙江农业学报 ›› 2020, Vol. 32 ›› Issue (9): 1692-1701.DOI: 10.3969/j.issn.1004-1524.2020.09.18

基于LOADEST模型和小波变换的河流氮磷污染动态分析

金亚楠, 张柏发, 郝韵, 邬建红, 吕军^*

浙江大学环境与资源学院,浙江杭州 310058

收稿日期:2020-04-01 出版日期:2020-09-25 发布日期:2020-10-10
通讯作者: *吕军,E-mail:jlu@zju.edu.cn
作者简介:金亚楠(1995—),女,浙江武义人,硕士研究生,主要从事流域非点源污染控制研究。E-mail:yanan@zju.edu.cn
基金资助:
国家自然科学基金(41977006)

Dynamic analysis of river nitrogen and phosphorus pollution based on LOADEST model and wavelet transform

JIN Yanan, ZHANG Baifa, HAO Yun, WU Jianhong, LYU Jun^*

College of Environment and Natural Resources, Zhejiang University, Hangzhou 310058, China

Received:2020-04-01 Online:2020-09-25 Published:2020-10-10

摘要/Abstract

摘要： 河流中污染物负荷量的估算及其演变规律的分析是开展流域非点源污染治理的基础。然而,常见的每月1~2次的低频率人工采样水质监测资料并不能反映河流水体中负荷量的每日连续变化。基于2003—2016年浙江省长乐江出口断面每月1次的水质监测资料,建立和验证了该河流总氮(TN)和总磷(TP)负荷量估算的LOADEST模型。应用该模型和连续的流量资料,核定了研究期间长乐江TN和TP的每日负荷量。结果表明,2003—2016年间长乐江TN年平均负荷量为(2 207.71±862.48)t·a^-1,TP年平均负荷量为(71.43±31.56)t·a^-1。TN和TP的日均负荷量变异较大,分别为(6.04±11.81)t·d^-1和(0.19±0.26)t·d^-1,它们在研究期间总体均呈上升趋势。采用小波分析方法,进一步揭示了研究期间长乐江TN和TP负荷量变化的基本规律。结果显示,长乐江TN负荷量以18个月的时间跨度为主发生着多时频的周期性变化;TP负荷量的变化主周期与TN负荷量的变化类似,但变化强度相对较弱。TN和TP负荷量周期性变化的决定性因素是河流流量的变化,受TN和TP浓度变化的影响较小。

关键词: 农业流域, 河流污染, 总氮, 总磷, 小波分析

Abstract: The estimation of pollutant loads in rivers and the analysis of their variations are the basis for non-point source pollution treatment. However, the low-frequency manual monitoring cannot reflect the daily continuous changes of water quality in rivers. Based on the monthly water quality monitoring data at the outlet section of Changle River in Zhejiang Province from 2003 to 2016, the LOADEST model for total nitrogen (TN) and total phosphorus (TP) load estimation in the river was calibrated and verified. Then, the daily TN and TP loads in the Changle River were estimated by using the continuous flow data. The results showed that, during 2003-2016, the average annual TN and TP loads in the river were (2 207.71±862.48) t·a^-1 and (71.43±31.56) t·a^-1, respectively, while their daily average loads were (6.04±11.81) t·d^-1 and (0.19±0.26) t·d^-1, respectively. Both the TN and TP loads had an increasing trend in the study period. Meanwhile, the variation patterns of TN and TP loads in the river during the research period were analyzed by using wavelet analysis method. It was found that the TN load in the Changle River had periodic changes with a main time span of 18 months. The variation of the TP load was similar to that of the TN load, but the varying intensity was relatively weak. The wavelet variance of TN and TP loads suggested that the periodic variations of TN and TP loads were mainly dependent on the periodic changes of river flow, yet less affected by TN and TP concentrations.

Key words: agricultural watershed, river pollution, total nitrogen, total phosphorus, wavelet analysis

中图分类号:

X522

金亚楠, 张柏发, 郝韵, 邬建红, 吕军. 基于LOADEST模型和小波变换的河流氮磷污染动态分析[J]. 浙江农业学报, 2020, 32(9): 1692-1701.

JIN Yanan, ZHANG Baifa, HAO Yun, WU Jianhong, LYU Jun. Dynamic analysis of river nitrogen and phosphorus pollution based on LOADEST model and wavelet transform[J]. , 2020, 32(9): 1692-1701.

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基于LOADEST模型和小波变换的河流氮磷污染动态分析

Dynamic analysis of river nitrogen and phosphorus pollution based on LOADEST model and wavelet transform

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