Assessment of the denitrification process in alluvial wetlands at floodplain scale using the SWAT model

Sun, Xiaoling; Bernard-Jannin, Léonard; Garneau, Cyril; Arnold, Jeffrey G.; Srinivasan, Raghavan; Sánchez‐Pérez, José‐Miguel

doi:10.1016/j.ecoleng.2016.06.098

Cited by 16 publications

(17 citation statements)

References 77 publications

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“…Under this condition, the soil profile is considered to be the shallow aquifer. The denitrification process in the shallow aquifer of the floodplain remains the same as in the previous SWAT-LUD model [16]. The denitrification process considers the influence of organic carbon from both the water and soil/aquifer sediment on the denitrification rate.…”

Section: Denitrification In the Swat-lud Modelmentioning

confidence: 69%

“…The SWAT-LUD model has been applied to one SL in previous studies and has shown its ability to quantify the SW-GW-exchanged water volume and the shallow aquifer denitrification rate correctly [15,16]. However, the previous studies of the SWAT-LUD model focused on the riparian area only, and the impacts of the SW-GW exchange on river water flow and the influence of denitrification occurring in the shallow aquifer on river water nitrate were not evaluated.…”

Section: Introductionmentioning

confidence: 99%

“…The nitrate concentrations in the LUs were simulated by the model. Studies have found that the further away from the river, the more stable the DOC concentrations [16]. In our study, the DOC concentrations in LU2 and LU3 were assumed to be constant.…”

Section: Subbasin-lu Area (Km 2 )mentioning

confidence: 99%

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Using SWAT-LUD Model to Estimate the Influence of Water Exchange and Shallow Aquifer Denitrification on Water and Nitrate Flux

Sun

Bernard-Jannin

Grusson

et al. 2018

Water

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Numerous studies have pointed out the importance of groundwater and surface water interaction (SW-GW) in a river system. However; those functions have rarely been considered in large scale hydrological models. The SWAT-LUD model has been developed based on the Soil and Water Assessment Tool (SWAT) model; and it integrates a new type of subbasin; which is called subbasin-LU (SL); to represent the floodplain area. New modules representing SW-GW exchanges and shallow aquifer denitrification are developed in the SWAT-LUD model. In this study; the SWAT-LUD model was applied to the middle floodplain area of the Garonne catchment in France. The results showed that the SWAT-LUD model could represent the SW-GW exchange and shallow aquifer denitrification appropriately. An annual 44.1 × 10 7 m 3 of water flowed into the river from the study area; but the annual exchanged water volume was 6.4 × 10 7 m 3 ; which represented just 1% of the river discharge. A total of 384 tons of N-NO 3 − (0.023 t·ha −1 ) was consumed by denitrification in the floodplain shallow aquifer annually. The nitrate concentration (N-NO 3 − ) decrease in the channel was 0.12 mg·L −1 ; but in the shallow aquifer it reached 11.40 mg·L −1 ; 8.05 mg·L −1 ; and 5.41 mg·L −1 in LU1; LU2; and LU3; respectively. Our study reveals that; in the Garonne floodplain; denitrification plays a significant role in the attenuation of nitrate associated with groundwater; but the impacts of denitrification on nitrate associated with river water is much less significant.

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Section: Denitrification In the Swat-lud Modelmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using SWAT-LUD Model to Estimate the Influence of Water Exchange and Shallow Aquifer Denitrification on Water and Nitrate Flux

Sun

Bernard-Jannin

Grusson

et al. 2018

Water

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“…(, ) and Sun et al. (, ). Geographically isolated wetlands can be defined as LSUs or even as HRUs, as flow can be routed at HRU level as well.…”

Section: Introductionmentioning

confidence: 99%

“…A denitrification module was successfully added to the SWAT‐LUD model by Sun et al. (). Hoang et al.…”

Section: Introductionmentioning

confidence: 99%

Representing the Connectivity of Upland Areas to Floodplains and Streams in SWAT+

Bieger

Arnold

Rathjens³

et al. 2019

J American Water Resour Assoc

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In recent years, watershed modelers have put increasing emphasis on capturing the interaction of landscape hydrologic processes instead of focusing on streamflow at the watershed outlet alone. Understanding the hydrologic connectivity between landscape elements is important to explain the hydrologic response of a watershed to rainfall events. The Soil and Water Assessment Tool+ (SWAT+) is a new version of SWAT with improved runoff routing capabilities. Subbasins may be divided into landscape units (LSUs), e.g., upland areas and floodplains, and flow can be routed between these LSUs. We ran three scenarios representing different extents of connectivity between uplands, floodplains, and streams. In the first and second scenarios, the ratio of channelized flow from the upland to the stream and sheet flow from the upland to the floodplain was 70/30 and 30/70, respectively, for all upland/floodplain pairs. In the third scenario, the ratio was calculated for each upland/floodplain pair based on the upland/floodplain area ratio. Results indicate differences in streamflow were small, but the relative importance of flow components and upland areas and floodplains as sources of surface runoff changed. Also, the soil moisture in the floodplains was impacted. The third scenario was found to provide more realistic results than the other two. A realistic representation of connectivity in watershed models has important implications for the identification of pollution sources and sinks.

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Methodologies and Management Framework for Restoration of Wetland Hydrologic Connectivity: A Synthesis

Meng

Liu

Bao

et al. 2020

Integr Envir Assess & Manag

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Under the dual influences of high‐intensity anthropogenic activity and climate change, wetland hydrologic connectivity (HC) has decreased significantly, resulting in the severe fragmentation of wetlands, a decrease in wetland area, and a degradation of hydrological functions, resulting in a worsening disaster response to floods and droughts. Dynamic changes in wetland HC are affected by a variety of factors. Many degraded wetlands have undergone measures to restore HC. Recovery can improve the HC pattern of degraded wetlands. Based on the knowledge of practitioners and a review of the literature, it was found that recovery measures can be divided into structural recovery and functional recovery according to the specific recovery objectives. However, the current recovery method lacks a holistic analysis of the HC pattern. To this end, we propose a hydrologic network–water balance‐based HC recovery and management framework that overcomes the limitations of single‐drive‐factor repair and local repair effects. Integr Environ Assess Manag 2020;16:438–451. © 2020 SETAC

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Assessment of the denitrification process in alluvial wetlands at floodplain scale using the SWAT model

Cited by 16 publications

References 77 publications

Using SWAT-LUD Model to Estimate the Influence of Water Exchange and Shallow Aquifer Denitrification on Water and Nitrate Flux

Using SWAT-LUD Model to Estimate the Influence of Water Exchange and Shallow Aquifer Denitrification on Water and Nitrate Flux

Representing the Connectivity of Upland Areas to Floodplains and Streams in SWAT+

Methodologies and Management Framework for Restoration of Wetland Hydrologic Connectivity: A Synthesis

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