Understanding Land use/Land cover dynamics and impacts of human activities in the Mekong Delta over the last 40 years

Liu, Shu’an; Li, Xing; Chen, Dan; Duan, Yuanqiang; Ji, Hanyu; Zhang, Liangpeng; Chai, Qi; Xiao-dong, HU

doi:10.1016/j.gecco.2020.e00991

Cited by 66 publications

(40 citation statements)

References 45 publications

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“…8). Dense networks of small channels in a mangrove forest indicate that a location is further away from achieving equilibrium between sediment and hydrodynamic forcing conditions than a location with more sparse networks of large channels (van Maanen et al, 2015;Xu et al, 2017). With such evidence, this study concludes that zone b of the high-connectivity channel, which has greater accumulation rates over the past century and apparently young secondary tidal channels, is relatively far away from equilibrium.…”

Section: Along-channel Depositionmentioning

confidence: 67%

“…To aid in the interpretation of 210 Pb profiles and recognize sedimentary structures within cores, X-radiograph negatives were visually examined and characterized. Because tidal-channel network geometry is expected to evolve from clustered small channels to dispersed large channels as the morphology approaches equilibrium with sediment-forcing and hydrodynamic-forcing conditions (van Maanen et al, 2015;Xu et al, 2017), spatial variations in channel-network geometry may signify the relative age of tidal flats. Therefore, to detect clustering patterns for each size class of secondary tidal channels, survey data were analyzed using the Multi-Distance Spatial Cluster Analysis tool in ARCGIS v10.6.1 (Esri, Redlands, CA, USA).…”

Section: Laboratory and Analytical Techniquesmentioning

confidence: 99%

“…The presence of stabilizing vegetation influences this temporal evolution. For example, a morphodynamic model developed by van Maanen et al (2015) demonstrates that the presence of mangrove vegetation influences channel-network geometry in tidal embayments. This morphodynamic model was coupled to a mangrovepopulation model in order to study how mangroves in sandy tidal embayments influence long-term channel-network evolution.…”

Section: Introductionmentioning

confidence: 99%

“…Qualitative results from numerical simulations that produced channel evolution from an initially unchannelled bathymetry reveal that mangroves first enhance channel branching by concentrating tidal flows and reducing bed erodibility (<160 years), but ultimately produce a seaward retreat of the channel network by promoting accretion and reducing the tidal prism (ca 1000 years). In general, tidal-flat morphology evolves from clustered networks of small channels to more dispersed and stable networks of large channels, particularly in regions with dense vegetation such as mangroves (van Maanen et al, 2015) and marsh grass (Xu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of a macrotidal back‐barrier environment: The Amazon Coast

et al. 2020

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Coastal barriers provide sheltered, low-energy settings for fine-grained sediment deposition and retention, although the process of back-barrier infilling and how tidal-channel connectivity impacts this process is not well-understood. Understanding how back-barrier environments infill and evolve is necessary to predict how they will respond to future changes in sea-level and sediment supply. With this motivation, in situ observations and sedimentary signatures from an Amazonian channel system are interpreted to create a conceptual model of morphological evolution in a macrotidal backbarrier environment that is rich in fine-grained sediment, vegetated by mangroves and incised by tidal channels with multiple outlets. Results indicate that within a high-connectivity back-barrier channel, tidal processes dominate sedimentation and morphological development. Sediment cores (<60 cm) exhibited millimetre-scale tidalites composed of sand and mud. High-connectivity channels allow tidal propagation from multiple inlets, and in this case, the converging flood waves promote delivery of sediment fluxing through the system to the mangrove flats in the convergence zone. Sediment preferentially deposits in regions with adequate accommodation space and dense vegetation, and in these zones, sediment grain size is slightly finer than that transiting through the system. The greatest sediment-accumulation rates (3 to 4 cm yr À1), calculated from steady-state 210 Pb profiles, were found in the convergence zone near the mangrove-channel edge. As tidal flats aggrade vertically and prograde into the channels, accommodation space diminishes. In effect, the channel's narrowest stretch is expected to migrate along the path of net-sediment flux towards regions with more accommodation space until it reaches the tidal-convergence zone. The location of recent preferential infilling is evidenced by relatively rapid sediment-accumulation rates, finer sediment and significant clustering of small secondary tidal channels. These findings shed light on how sediment transported through vegetated back-barrier environments is ultimately preserved and how evidence preserved in surface morphology and the geological record can be interpreted.

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Section: Along-channel Depositionmentioning

confidence: 67%

Section: Laboratory and Analytical Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of a macrotidal back‐barrier environment: The Amazon Coast

et al. 2020

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“…The living spaces of the Hubaoe urban agglomeration in the central part of the Inner Mongolia, Chifeng and Tongliao areas in the east are relatively concentrated. The spatial change in EPLS can act as a comprehensive indicator of regional coordinated development and is affected by both natural and human drivers [2,25,26]. However, over time scales of several decades or even hundreds of years, the impact of natural factors is mainly embodied in cumulative and background effects, whereas the impact of human factors as the main driver of land use change is relatively easy to detect [27].…”

Section: Quantitative Analysis Of Driving Forcesmentioning

confidence: 99%

Multidimensional Analysis of the Spatiotemporal Variations in Ecological, Production and Living Spaces of Inner Mongolia and an Identification of Driving Forces

et al. 2020

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There is increasing focus on the difficult challenge of realizing coordinated development of production, living and ecological spaces within the regional development process. An ecological–production–living space evaluation index system was established in this study based on the concept of ecological, production and living spaces (EPLSs), the relationship between land use function and land use type and the national standard of land use classification. The aim of this study was to reveal the driving forces and patterns of variation in EPLSs in Inner Mongolia from 1990 to 2015. The results indicated that Inner Mongolia is mainly dominated by ecological space, followed by production space. Production and living spaces are mainly distributed to the south of the Greater Hinggan–Yinshan–Helan mountain ranges. Spatial changes in EPLSs were accelerated with prominent regional differences, with declining ecological area and increasing living and production spaces. Regional urbanization and industrialization were identified as the driving forces for change in EPLS in Inner Mongolia. It is hoped that the findings of this study can provide rational guidance for management of land use and coordinated development of EPLSs within Inner Mongolia.

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Technical and financial feasibility for intensification of the extensive shrimp farming area in Mekong Delta, Vietnam

Schuur¹,

McNevin

Davis

et al. 2021

Aquaculture Fish & Fisheries

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Engineering design studies and financial feasibility assessments were made for construction, maintenance, equipment, operations, loan requirement, shrimp sales and predicted cash flows for simulated transformations of extensive shrimp farms to intensive shrimp farms in the Mekong Delta, Vietnam. Farms with less than 2.8 ha of feedbased, aerated production ponds would not be profitable at shrimp yields less than 5 t/ha/year. Profit projections increased in response to greater production area on farms and larger annual pond yields. Farms with 6 ha or more of production ponds and yields of 10 t/ha/year or more had the best profit potential. Greater profitability at higher production intensity resulted from a reduction in the labour cost/product weight ratio as yield per unit area increased. Transformation from extensive to intensive farms would allow greater shrimp production, increase worker income and lessen land and water use. Environmental benefits would include a reduction in sediment starvation of the Mekong Delta, and the option to restore some of the several hundred thousand hectares of mangrove area severely degraded by extensive shrimp farming.These two improvements would be of benefit in retarding erosion along the Mekong Delta coastline. The possibility of intensification and consolidation of the shrimp farming area in the Mekong Delta deserves further consideration.

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Understanding Land use/Land cover dynamics and impacts of human activities in the Mekong Delta over the last 40 years

Cited by 66 publications

References 45 publications

Morphological evolution of a macrotidal back‐barrier environment: The Amazon Coast

Morphological evolution of a macrotidal back‐barrier environment: The Amazon Coast

Multidimensional Analysis of the Spatiotemporal Variations in Ecological, Production and Living Spaces of Inner Mongolia and an Identification of Driving Forces

Technical and financial feasibility for intensification of the extensive shrimp farming area in Mekong Delta, Vietnam

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