Comment on “Soil salinity assessment by using near-infrared channel and Vegetation Soil Salinity Index derived from Landsat 8 OLI data: a case study in the Tra Vinh Province, Mekong Delta, Vietnam” by Kim-Anh Nguyen, Yuei-An Liou, Ha-Phuong Tran, Phi-Phung Hoang and Thanh-Hung Nguyen

Silvestri, S.; Nguyen, Diep N.; Chiapponi, Emilia

doi:10.1186/s40645-022-00490-7

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Recently, some attempts have been made to map soil salinity via remote sensing (Nguyen et al., 2020) or remote sensing combined with machine learning (Nguyen, Tran, et al., 2021; Pham et al., 2019). Although remote sensing‐based methods are capable of monitoring soil salinity over large areas, its effectiveness when applied in the VMD is controversial due to the distribution of floodplains causing errors during interpolation (Silvestri et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta

Nguyen,

Germer,

Asch

2023

J Agronomy Crop Science

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The Vietnam Mekong Delta (VMD) is threatened by increasing saltwater intrusion due to diminishing freshwater availability, land subsidence, and climate change induced sea level rise. Through irrigation, saltwater can accumulate in the rice fields and decrease rice production. The study aims at evaluating topsoil salinity and examining a potential link between topsoil salinity and rice production systems in a case study in the Tra Vinh province of the VMD. For this, we applied two geophysical methods, namely, 3D electrical resistivity tomography (ARES II) and electromagnetic induction (EM38‐MK2). 3D ARES II measurements with different electrode spacings were compared with EM38‐MK2 topsoil measurements to evaluate their respective potential for monitoring topsoil salinity on an agricultural scale and the relationship between land‐use types and topsoil salinity. Results show that EM38‐MK2 is a rapid and powerful tool for obtaining high‐resolution topsoil salinity maps for rice fields. With ARES II data, 3D maps up to 40 m depth can be created, but compared with EM38‐MK2 topsoil maps, topsoil salinity was underestimated due to limitations in resolution. Salt contamination of above 300 mS m−1 was found in some double‐cropped rice fields, whereas in triple‐cropped rice fields salinity was below 200 mS m−1. Results clearly show a relation between topsoil salinity and proximity to the saline water sources; however, a clear link between rice production and topsoil salinity could not be established. The study proved that geophysical methods are useful tools for assessing and monitoring topsoil salinity at agricultural fields scale in the VMD.

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Section: Introductionmentioning

confidence: 99%

Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta

Nguyen,

Germer,

Asch

2023

J Agronomy Crop Science

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“…Discussion started: 22 March 2023 c Author(s) 2023. CC BY 4.0 License.The vegetation change analysis was performed based on the methodology bySilvestri et al (2022), with some modifications applied. The process includes shoreline delineation using ISP cluster unsupervised classification in ArcGIS, transect creation based on selected GPS profiles, gridding, and centroid creation at 1m x 1m resolution.…”

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confidence: 99%

Dune belt restoration effectiveness assessed by UAV topographic surveys (Northern Adriatic coast, Italy)

Faelga

Cantelli²,

Silvestri³

et al. 2023

Preprint

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Abstract. Unmanned Aerial Vehicle (UAV) monitoring surveys are used to assess a dune restoration project in the protected natural area of the Bevano River mouth in the Northern Adriatic coast (Ravenna, Italy). UAV is among the most utilized tools in coastal geomorphology studies as high-spatial and temporal resolution surveys can be carried out in an efficient and cost-effective manner. The impact of the installed fences to dune development are assessed in terms of sand volume and vegetation cover changes over time by using a systematic data processing workflow based on Structure from Motion (SfM) photogrammetry and Geomorphic Change Detection (GCD) toolset. Accuracy assessment is performed using statistical analysis between GPS profiles and the elevation models. Results show that the dune fence proves to be effective to prevent dune erosion since significant sand accumulation is observed along the dune foot and front. Progradation of around 3–5 m of the foredune, development of embryo dunes, decrease in stoss slope and blowout features due to increase in vegetation colonization were observed. Erosion is evident at the northern portion of the structure, which could be accounted for by the aerodynamic and morphodynamic conditions around the dune fence, the efficiency of the fence and its configuration to trap sediments. Dune fencing and limiting debris cleaning along the protected coast has been proven to be very effective against dune degradation. The GCD toolset can be a valuable tool if sources of uncertainties are well accounted for. The proposed workflow can also aid in creating transferable guidelines to stakeholders in ICZM implementation in the Mediterranean low-lying sandy coasts.

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Detection and mitigation of soil salinization risk from saline/brackish water aquaculture in coastal areas: an application of remote sensing and managed aquifer recharge

Nguyen,

Chiapponi,

Nguyen

et al. 2024

J Coast Conserv

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This study focuses on detecting and mitigating soil salinization in four coastal areas of the Mekong Delta (Vietnam). Salinity patterns in the soils of the Mekong River Delta are not random but linked to land use practices and distance to the sea. We examine two quick yet reliable remote sensing-based techniques to detect the coastal aquaculture area and separate it from the inland freshwater farmland. These techniques can eventually be used to identify locations with an elevated risk of salinization in other coastal regions. Finally, we investigate a salinization mitigation solution based on creating a managed aquifer recharge system along the buffer zone that separates the coastal aquaculture area from the inland freshwater agriculture area. The implementation of an infiltration pond system is technically feasible in the Mekong Delta provided that hydrogeological characteristics, the fresh-saline interface position, and freshwater demands are considered. The transitional zone between freshwater agriculture and brackish water aquaculture in Bac Lieu, Soc Trang, Tra Vinh and Ben Tre provinces is optimal for implementing an aquifer recharge/freshwater barrier scheme.

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Comment on “Soil salinity assessment by using near-infrared channel and Vegetation Soil Salinity Index derived from Landsat 8 OLI data: a case study in the Tra Vinh Province, Mekong Delta, Vietnam” by Kim-Anh Nguyen, Yuei-An Liou, Ha-Phuong Tran, Phi-Phung Hoang and Thanh-Hung Nguyen

Cited by 5 publications

References 23 publications

Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta

Evaluating topsoil salinity via geophysical methods in rice production systems in the Vietnam Mekong Delta

Dune belt restoration effectiveness assessed by UAV topographic surveys (Northern Adriatic coast, Italy)

Detection and mitigation of soil salinization risk from saline/brackish water aquaculture in coastal areas: an application of remote sensing and managed aquifer recharge

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