A three-dimensional and multi-source integrated technology system for controlling rural non-point source pollution in the Three Gorges Reservoir Area, China

Zhong, Shuang; Chen, Fangxin; Xie, Deti; Shao, Jianbo; Yao, Yi; Zhang, Sheng; Zhang, Qingwen; Wei, Chaofu; Yang, Qingyuan; Ni, Jinren

doi:10.1016/j.jclepro.2020.122579

Cited by 19 publications

(8 citation statements)

References 50 publications

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“…The factors impacting pollutant removal were explored based on the simulation results of the existing ponds and ditches in the study area, as these existing structures contribute to rational placements of future constructions (Figure 9). In terms of ponds, recent works using data collection and local wetland estimations have indicated that nitrogen removal increases linearly with an increase in wetland areas (Cheng et al., 2020; Zhong et al., 2020). Some studies using the SWAT model have also concluded that the removal efficiency of pollutant loads is dependent on the wetland areas (Liu et al., 2019; Yang & Best, 2015).…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…Earlier studies have shown that spatial and geopolitical partitions of arable plots caused by the topographical structure are the main reason for CLF 78 , the renovation mode should be 9/16 established according to local conditions. As we all know, Caotangxi Watershed is mostly hilly and mountainous, and the topography is not similar to that of the plain area 49 . Under this circumstance, it is essential to take active and targeted specific measures in the watershed to relieve the CLF from different aspects:…”

Section: Figure 9 Cultivated Land Landscape Fragmentation Index In Di...mentioning

confidence: 99%

Consolidation quantitative analysis on cultivated land fragmentation and its terrain gradient effect in mountainous areas of southwest China: A case study of Caotangxi watershed in the Three Gorges Reservoir Area

Yang

2022

Preprint

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Cultivated land fragmentation (CLF) has become the main obstacle restricting rural revitalization and agricultural modernization management in China, especially in southwest mountainous areas. And it’s of great significance to investigate the spatial-temporal evolution law of cultivated land as well as to facilitate regional food security and land management. Taking widely used areas of the Caotangxi River watershed as examples, based on landscape pattern principle, this paper constructs an evaluation system of CLF by landscape metrics. We firstly analyzed the temporal and spatial characteristics of cultivated landscape through the method of cultivated landscape gradient, calculated the value of CLF to reveal its evolution and spatial characteristics, explored the topographic gradient effects of CLF, and further summarized its modes. The results show that the area where arable land is concentrated are often comparatively crushed and distributed in the plain areas along the river banks. CLF in watersheds presented the overall improvement trend by the influence of natural conditions and China’s ecological policies. The overall level of CLF in the watershed is low during the whole study period, and the spatial evolution is uneven. The CLF displays pronounced regional divergence patterns in space, and the value of CLF is comparatively high in terrain Grade 2 and 3, which is the pivotal area for alleviating the fragmentation in the subsequent work. These findings imply that the differences of characteristics of CLF with terrain gradient must be considered in the formulation of targeted policies for land consolidation in the watershed.

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“…Moreover, crop residues and farm waste and sewage [ 2 ] pose a high, potential environmental pollution risk [ 3 , 4 ]. Therefore, agricultural nonpoint source pollution (ANSP) has been recognized as a key factor significantly affecting water quality [ [5] , [6] , [7] , [8] ]. Consequently, although improving crop yields and the quality of agricultural products, concomitant with raising farmers income while reducing ANSP and livestock farming pollution, are all highly desirable, it is equally imperative to implement ACP by the adoption and adaptation of ecosystem-based approaches.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneously, the people, including some 318,900 farmers, reclaimed the sloped land to compensate for the loss of their submerged farmland, which exacerbated the conflict between people and land [ 27 ]. Water and soil have led to significant environmental problems by ANSP and intensive livestock, especially pig farming [ 7 , 28 ]. In addition, with the water storage of the Three Gorges Project, a narrow fluvial reservoir formed on the upper Yangtze River from Chongqing City to Yichang Hubei province, whose length is nearly 600 km, with a mean flow velocity of 0.9 m s −1 from torrent before, and a significantly reduced self-cleaning ability.…”

Section: Introductionmentioning

confidence: 99%

Findings on agricultural cleaner production in the three Gorges Reservoir Area

Zhou¹,

Luo²,

Wang³

et al. 2023

Heliyon

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A three-dimensional and multi-source integrated technology system for controlling rural non-point source pollution in the Three Gorges Reservoir Area, China

Cited by 19 publications

References 50 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

Consolidation quantitative analysis on cultivated land fragmentation and its terrain gradient effect in mountainous areas of southwest China: A case study of Caotangxi watershed in the Three Gorges Reservoir Area

Findings on agricultural cleaner production in the three Gorges Reservoir Area

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