Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth

Fluctuations in groundwater depth play an important role and are often overlooked when considering the transport of nitrogen in the unsaturated zone. To evaluate directly the variation of nitrogen transport due to fluctuations in groundwater depth, the prediction model of groundwater depth and nitro...

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Autores principales:	Jianmin Bian, Qian Wang, Siyu Nie, Hanli Wan, Juanjuan Wu
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	ecological critical groundwater depth fluctuations in groundwater depth ls-svm Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/a1ba4f6202454a93b46fc7da296f51f0
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spelling	oai:doaj.org-article:a1ba4f6202454a93b46fc7da296f51f02021-11-06T10:07:47ZUnderstanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth1606-97491607-079810.2166/ws.2021.066https://doaj.org/article/a1ba4f6202454a93b46fc7da296f51f02021-09-01T00:00:00Zhttp://ws.iwaponline.com/content/21/6/2691https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Fluctuations in groundwater depth play an important role and are often overlooked when considering the transport of nitrogen in the unsaturated zone. To evaluate directly the variation of nitrogen transport due to fluctuations in groundwater depth, the prediction model of groundwater depth and nitrogen transport were combined and applied by least squares support vector machine and Hydrus-1D in the western irrigation area of Jilin in China. The calibration and testing results showed the prediction models were reliable. Considering different groundwater depth, the concentration of nitrogen was affected significantly with a groundwater depth of 3.42–1.71 m, while it was not affected with groundwater depth of 5.48–6.47 m. The total leaching loss of nitrogen gradually increased with the continuous decrease of groundwater depth. Furthermore, the limited groundwater depth of 1.7 m was found to reduce the risk of nitrogen pollution. This paper systematically analyzes the relationship between groundwater depth and nitrogen transport to form appropriate agriculture strategies. HIGHLIGHTS The total leaching loss of nitrogen increases with the decrease of groundwater depth.; The limited groundwater depth is proposed for determining appropriate agriculture strategies.;Jianmin BianQian WangSiyu NieHanli WanJuanjuan WuIWA Publishingarticleecological critical groundwater depthfluctuations in groundwater depthls-svmWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 6, Pp 2691-2708 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ecological critical groundwater depth fluctuations in groundwater depth ls-svm Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	ecological critical groundwater depth fluctuations in groundwater depth ls-svm Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Jianmin Bian Qian Wang Siyu Nie Hanli Wan Juanjuan Wu Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
description	Fluctuations in groundwater depth play an important role and are often overlooked when considering the transport of nitrogen in the unsaturated zone. To evaluate directly the variation of nitrogen transport due to fluctuations in groundwater depth, the prediction model of groundwater depth and nitrogen transport were combined and applied by least squares support vector machine and Hydrus-1D in the western irrigation area of Jilin in China. The calibration and testing results showed the prediction models were reliable. Considering different groundwater depth, the concentration of nitrogen was affected significantly with a groundwater depth of 3.42–1.71 m, while it was not affected with groundwater depth of 5.48–6.47 m. The total leaching loss of nitrogen gradually increased with the continuous decrease of groundwater depth. Furthermore, the limited groundwater depth of 1.7 m was found to reduce the risk of nitrogen pollution. This paper systematically analyzes the relationship between groundwater depth and nitrogen transport to form appropriate agriculture strategies. HIGHLIGHTS The total leaching loss of nitrogen increases with the decrease of groundwater depth.; The limited groundwater depth is proposed for determining appropriate agriculture strategies.;
format	article
author	Jianmin Bian Qian Wang Siyu Nie Hanli Wan Juanjuan Wu
author_facet	Jianmin Bian Qian Wang Siyu Nie Hanli Wan Juanjuan Wu
author_sort	Jianmin Bian
title	Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
title_short	Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
title_full	Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
title_fullStr	Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
title_full_unstemmed	Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
title_sort	understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a1ba4f6202454a93b46fc7da296f51f0
work_keys_str_mv	AT jianminbian understandingnitrogentransportintheunsaturatedzonewithfluctuationsingroundwaterdepth AT qianwang understandingnitrogentransportintheunsaturatedzonewithfluctuationsingroundwaterdepth AT siyunie understandingnitrogentransportintheunsaturatedzonewithfluctuationsingroundwaterdepth AT hanliwan understandingnitrogentransportintheunsaturatedzonewithfluctuationsingroundwaterdepth AT juanjuanwu understandingnitrogentransportintheunsaturatedzonewithfluctuationsingroundwaterdepth
_version_	1718443813252366336

Understanding nitrogen transport in the unsaturated zone with fluctuations in groundwater depth

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