Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors

Ditch-pond systems can effectively alleviate the adverse effects of agricultural drainage on downstream canals and flood control in downstream areas. In this study, peak flow reduction rate (PFR) and drainage volume detention rate (DVD) are used to evaluate the effectiveness of an off-line ditch-pon...

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Autores principales:	Tao Shen, Rao Wang, Pingjin Jiao, Youzhen Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ditch-pond system detention farmland drainage off-line peak flow reduction Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
Acceso en línea:	https://doaj.org/article/aeb9080ce6834320a9e0b922eac08323
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id	oai:doaj.org-article:aeb9080ce6834320a9e0b922eac08323
record_format	dspace
institution	DOAJ
collection	DOAJ
language	EN
topic	ditch-pond system detention farmland drainage off-line peak flow reduction Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500
spellingShingle	ditch-pond system detention farmland drainage off-line peak flow reduction Hydraulic engineering TC1-978 Water supply for domestic and industrial purposes TD201-500 Tao Shen Rao Wang Pingjin Jiao Youzhen Wang Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
description	Ditch-pond systems can effectively alleviate the adverse effects of agricultural drainage on downstream canals and flood control in downstream areas. In this study, peak flow reduction rate (PFR) and drainage volume detention rate (DVD) are used to evaluate the effectiveness of an off-line ditch-pond system for reducing peak flow, retarding agricultural drainage water, and examining the key influencing factors. The results show that the PFR and DVD of the off-line ditch-pond system are significantly affected by three parameters: weir depth (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula>), weir width (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>), and pond area-to-drainage area ratio (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula>). Both the PFR and DVD increase with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula>. The effects of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> on the PFR and the DVD are significant, whereas that <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula> is relatively small. Adjusting <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> increases both the PFR and DVD up to 80%. Specifically, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> contributes 75% of the variations in the PFR and the DVD, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> affects only 17% of the PFR variations and 11% of the DVD variations. These findings confirm that an off-line ditch-pond system can be effectively used for the detention of agricultural drainage water. Thus, when such a system is designed with an appropriate diversion weir, the impact of agricultural drainage water on downstream canals and downstream areas can be reduced remarkably.
format	article
author	Tao Shen Rao Wang Pingjin Jiao Youzhen Wang
author_facet	Tao Shen Rao Wang Pingjin Jiao Youzhen Wang
author_sort	Tao Shen
title	Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
title_short	Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
title_full	Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
title_fullStr	Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
title_full_unstemmed	Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors
title_sort	evaluation of drainage water detention efficiency of off-line ditch-pond systems and its influencing factors
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/aeb9080ce6834320a9e0b922eac08323
work_keys_str_mv	AT taoshen evaluationofdrainagewaterdetentionefficiencyofofflineditchpondsystemsanditsinfluencingfactors AT raowang evaluationofdrainagewaterdetentionefficiencyofofflineditchpondsystemsanditsinfluencingfactors AT pingjinjiao evaluationofdrainagewaterdetentionefficiencyofofflineditchpondsystemsanditsinfluencingfactors AT youzhenwang evaluationofdrainagewaterdetentionefficiencyofofflineditchpondsystemsanditsinfluencingfactors
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spelling	oai:doaj.org-article:aeb9080ce6834320a9e0b922eac083232021-11-11T19:55:03ZEvaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors10.3390/w132130292073-4441https://doaj.org/article/aeb9080ce6834320a9e0b922eac083232021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4441/13/21/3029https://doaj.org/toc/2073-4441Ditch-pond systems can effectively alleviate the adverse effects of agricultural drainage on downstream canals and flood control in downstream areas. In this study, peak flow reduction rate (PFR) and drainage volume detention rate (DVD) are used to evaluate the effectiveness of an off-line ditch-pond system for reducing peak flow, retarding agricultural drainage water, and examining the key influencing factors. The results show that the PFR and DVD of the off-line ditch-pond system are significantly affected by three parameters: weir depth (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula>), weir width (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>), and pond area-to-drainage area ratio (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula>). Both the PFR and DVD increase with the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula>, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula>, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula>. The effects of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> on the PFR and the DVD are significant, whereas that <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>K</mi><mrow><mi>s</mi><mi>p</mi></mrow></msub></mrow></semantics></math></inline-formula> is relatively small. Adjusting <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> increases both the PFR and DVD up to 80%. Specifically, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>d</mi></msub></mrow></semantics></math></inline-formula> contributes 75% of the variations in the PFR and the DVD, and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></semantics></math></inline-formula> affects only 17% of the PFR variations and 11% of the DVD variations. These findings confirm that an off-line ditch-pond system can be effectively used for the detention of agricultural drainage water. Thus, when such a system is designed with an appropriate diversion weir, the impact of agricultural drainage water on downstream canals and downstream areas can be reduced remarkably.Tao ShenRao WangPingjin JiaoYouzhen WangMDPI AGarticleditch-pond systemdetentionfarmland drainageoff-linepeak flow reductionHydraulic engineeringTC1-978Water supply for domestic and industrial purposesTD201-500ENWater, Vol 13, Iss 3029, p 3029 (2021)

Evaluation of Drainage Water Detention Efficiency of Off-Line Ditch-Pond Systems and Its Influencing Factors

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