New indexes to evaluate the effect of segmental variations of distributed ditches on their pollutant retention in agricultural landscapes

Jia, Zhang; Yin, Xiaomeng; Luo, Weihong; Zou, Jiarong; Chen, Chuanxiang

doi:10.1016/j.agwat.2020.106567

Cited by 3 publications

(2 citation statements)

References 36 publications

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“…Studies have revealed that 5.30%–95.00% of total nitrogen (TN) or total phosphorus (TP) are removed in the ditches, while 1.50%–98.40% TN and TP are removed in ponds (Liu et al., 2021; Nsenga Kumwimba et al., 2018). One recent review further suggested that a DPS intercepted 60%–90% of agricultural nonpoint‐source (NPS) pollutants (Jia et al., 2021). Overall, most studies on pollutant removal by ditches or ponds were based on monitoring irrigation and discharge units (Li, Zhang, et al., 2020; Moore et al., 2010).…”

Section: Introductionmentioning

confidence: 99%

New Modeling Framework for Describing the Pollutant Transport and Removal of Ditch‐Pond System in an Agricultural Catchment

Cheng

Chen

Liu

et al. 2021

Water Resources Research

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Ditch‐pond systems (DPSs) play a key role in hydrologic regulation and pollutant removal in agricultural regions, yet there is a lack of quantitative tools that describe their complex transport and removal processes across spatial scales. To fill this gap, a new modeling framework is proposed by implementing three improvements based on the typical watershed models: (a) the explicit rasterization of natural‐artificial drainage, (b) accurate spatial representations of ditches and ponds, and (c) the development of a pollutant‐removal module. This framework is exemplified for a DPS‐dominated catchment in the Three Gorges Reservoir Region, China. The results revealed that 55.36% of the drainage areas in this catchment were dominated by ditch networks, highlighting the significant impacts of artificial factors. The results simulated by the new framework also indicated the great impacts of specific pond distributions on pollutant removal. In this context, pollutant exports in DPSs were distinctly lower than that in natural situation modeling, about 25.14%–46.65% of pollutants are removed by DPSs. On this basis, the scenario analysis also explored the critical placements of ponds and ditches to optimize pollutant removal and to enhance agricultural management in DPSs. This new framework is available for other real DPS‐dominated catchments with potential applications in typical model augmentations and improvements.

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Section: Introductionmentioning

confidence: 99%

New Modeling Framework for Describing the Pollutant Transport and Removal of Ditch‐Pond System in an Agricultural Catchment

Cheng

Chen

Liu

et al. 2021

Water Resources Research

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“…To address this problem, scattered ponds can be connected to drainage ditches to temporarily store a portion of the water from a drainage area and reduce the peak flow, and this strategy effectively reduces the impact of agricultural drainage on drainage canals and downstream areas [3,4]. Ditch-pond systems can also reduce the nonpoint pollution from farmlands and simultaneously store some of the drainage water for supplemental irrigation during a drought period [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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

Shen

Wang

Jiao

et al. 2021

Water

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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 (Ld), weir width (Lw), and pond area-to-drainage area ratio (Ksp). Both the PFR and DVD increase with the increase in Ld, Lw, and Ksp. The effects of Ld and Lw on the PFR and the DVD are significant, whereas that Ksp is relatively small. Adjusting Ld and Lw increases both the PFR and DVD up to 80%. Specifically, Ld contributes 75% of the variations in the PFR and the DVD, and Lw 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.

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Ditches and Ponds Can Be the Sources or Sinks of Non-Point Source Pollution: Observations in an Upland Area in the Jinglinxi Catchment, China

WANG,

CHEN,

ZHU

et al. 2023

Front. Agr. Sci. Eng.

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New indexes to evaluate the effect of segmental variations of distributed ditches on their pollutant retention in agricultural landscapes

Cited by 3 publications

References 36 publications

New Modeling Framework for Describing the Pollutant Transport and Removal of Ditch‐Pond System in an Agricultural Catchment

New Modeling Framework for Describing the Pollutant Transport and Removal of Ditch‐Pond System in an Agricultural Catchment

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

Ditches and Ponds Can Be the Sources or Sinks of Non-Point Source Pollution: Observations in an Upland Area in the Jinglinxi Catchment, China

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