Numerical study of hydrodynamic and salinity transport process in Pink Beach wetlands of Liao River Estuary, China (os-2017-102)

2018 ◽  
Author(s):  
Anonymous
Keyword(s):  
Transport Process ◽  
Numerical Study ◽  
River Estuary ◽  
Salinity Transport

scholarly journals Numerical study of hydrodynamic and salinity transport process in Pink Beach wetlands of Liao River Estuary, China

2018 ◽  
Author(s):  
Huiting Qiao ◽  
Mingliang Zhang ◽  
Hengzhi Jiang ◽  
Tianping Xu ◽  
Hongxing Zhang
Keyword(s):  
Transport Process ◽  
Numerical Study ◽  
Spring Tide ◽  
Tidal Flow ◽  
River Estuary ◽  
Morphological Characteristics ◽  
Hydrodynamic Characteristics ◽  
Vegetation Growth ◽  
Salinity Transport ◽  
Friction Term

Abstract. The interaction study of vegetation with the flow environment is essential for the determination of the bank protection, morphological characteristics and ecological conditions for the wetlands. This paper uses MIKE 21 hydrodynamic and salinity model to simulate the hydrodynamic characteristics and salinity transport process in Pink Beach wetlands of Liao River estuary. The effect of wetland plant on tidal flow in areas of wetland waters is represented by a varying Manning's coefficient in the bottom friction term. Acquisition of vegetation distribution is based on Landsat TM satellites through remote sensing techniques. The detailed comparisons between field observation and simulated result of water depth, salinity and tidal currents at neap tide and spring tide are presented in vegetated domain of Pink Beach. Satisfactory results are obtained in simulating both flow characteristic and salinity concentration with or without vegetation. Several stations from upstream to downstream in the Pink Beach are selected to estimate the longitudinal variation of salinity under different river runoffs and the results show that the salinity concentration decreases with an increase of river runoff. This study can help to increase understanding of the favorable salinity conditions for the special vegetation growth in the Pink Beach wetlands of Liao River estuary. The results provide crucial guidance for related interaction studies among vegetation, flow and salinity in other wetland waters.

scholarly journals Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco). Effect of the "Super Blood Moon" (total lunar eclipse) of 2015

2016 ◽  
Author(s):  
Soufiane Haddout ◽  
Mohammed Igouzal ◽  
Abdellatif Maslouhi
Keyword(s):  
Extreme Event ◽  
Transport Model ◽  
Numerical Study ◽  
Rapid Assessment ◽  
River Estuary ◽  
Lunar Eclipse ◽  
Salinity Intrusion ◽  
Salt Intrusion ◽  
Salinity Transport ◽  
The Impact

Abstract. The longitudinal variation of salinity and the maximum salinity intrusion length in an alluvial estuary are important environmental concerns for policy makers and managers since they influence water quality, water utilization and agricultural development in estuarine environments and the potential use of water resources in general. Total eclipses of Super-Moons are rare. According to NASA, they have only occurred five times in the 1900s – in 1910, 1928, 1946, 1964 and 1982. After the 28 September 2015 Total lunar eclipse, a Super-Bloodmoon eclipse will not recur before 8 October 2033. In this paper, for the first time, the impact of the total lunar eclipse (Super Blood Moon) on the salinity intrusion along an estuary is studied. The 28 September 2015 total lunar eclipse is focused by the study and the Sebou river estuary (Morocco) is taking as an application area. The Sebou estuary is an area with high agricultural potential, is becoming one of the most important industrial zones in Morocco and it is experiencing a salt intrusion problem. Hydrodynamic equations for tidal wave propagation coupled with (Savenije theory), and a numerical salinity transport model (HEC-RAS) are applied to study the impact of the total lunar eclipse on the salinity intrusion. Intensive salinity measurements during this extreme event were recorded along the Sebou estuary. Measurements showed a modification of the shape of axial salinity profiles and a notable water elevation rise, compared with normal situations. The two optimization parameters (Van Der Burgh's and dispersion coefficients) of the analytical model are estimated based on the Levenberg–Marquardt's algorithm (i.e. solving non-linear least squares problems). The salinity transport model was calibrated and validated using field data. The results show that the two models described very well salt intrusion during the total lunar eclipse day. A good-fit between computed salinity and measurements is obtained, as verified by statistical performance tests. These two models can give a rapid assessment of salinity distribution and consequently help to ensure the safety of water supply, even during such infrequent astronomical phenomenon.

scholarly journals Analytical and numerical study of the salinity intrusion in the Sebou river estuary (Morocco) – effect of the “Super Blood Moon” (total lunar eclipse) of 2015

2016 ◽  
Vol 20 (9) ◽  
pp. 3923-3945 ◽  
Author(s):  
Soufiane Haddout ◽  
Mohammed Igouzal ◽  
Abdellatif Maslouhi
Keyword(s):  
Extreme Event ◽  
Transport Model ◽  
Numerical Study ◽  
Rare Event ◽  
River Estuary ◽  
Lunar Eclipse ◽  
Salinity Intrusion ◽  
Salt Intrusion ◽  
Salinity Transport ◽  
The Impact

Abstract. The longitudinal variation of salinity and the maximum salinity intrusion length in an alluvial estuary are important environmental concerns for policy makers and managers since they influence water quality, water utilization and agricultural development in estuarine environments and the potential use of water resources in general. The supermoon total lunar eclipse is a rare event. According to NASA, they have only occurred 5 times in the 1900s – in 1910, 1928, 1946, 1964 and 1982. After the 28 September 2015 total lunar eclipse, a Super Blood Moon eclipse will not recur before 8 October 2033. In this paper, for the first time, the impact of the combination of a supermoon and a total lunar eclipse on the salinity intrusion along an estuary is studied. The 28 September 2015 supermoon total lunar eclipse is the focus of this study and the Sebou river estuary (Morocco) is used as an application area. The Sebou estuary is an area with high agricultural potential, is becoming one of the most important industrial zones in Morocco and it is experiencing a salt intrusion problem. Hydrodynamic equations for tidal wave propagation coupled with the Savenije theory and a numerical salinity transport model (HEC-RAS software "Hydrologic Engineering Center River Analysis System") are applied to study the impact of the supermoon total lunar eclipse on the salinity intrusion. Intensive salinity measurements during this extreme event were recorded along the Sebou estuary. Measurements showed a modification of the shape of axial salinity profiles and a notable water elevation rise, compared with normal situations. The two optimization parameters (Van der Burgh's and dispersion coefficients) of the analytical model are estimated based on the Levenberg–Marquardt's algorithm (i.e., solving nonlinear least-squares problems). The salinity transport model was calibrated and validated using field data. The results show that the two models described very well the salt intrusion during the supermoon total lunar eclipse day. A good fit between computed salinity and measurements is obtained, as verified by statistical performance tests. These two models can give a rapid assessment of salinity distribution and consequently help to ensure the safety of the water supply, even during such infrequent astronomical phenomenon.

scholarly journals Numerical study of hydrodynamic and salinity transport processes in the Pink Beach wetlands of the Liao River estuary, China

Ocean Science ◽  
2018 ◽  
Vol 14 (3) ◽  
pp. 437-451 ◽  
Author(s):  
Huiting Qiao ◽  
Mingliang Zhang ◽  
Hengzhi Jiang ◽  
Tianping Xu ◽  
Hongxing Zhang
Keyword(s):  
Water Depth ◽  
River Runoff ◽  
Numerical Study ◽  
River Estuary ◽  
Tidal Currents ◽  
Transport Processes ◽  
Vegetation Density ◽  
Interaction Studies ◽  
Salinity Transport ◽  
The Impact

Abstract. Interaction studies of vegetation within flow environments are essential for the determination of bank protection, morphological characteristics and ecological conditions for wetlands. This paper uses the MIKE 21 hydrodynamic and salinity model to simulate the hydrodynamic characteristics and salinity transport processes in the Pink Beach wetlands of the Liao River estuary. The effect of wetland plants on tidal flow in wetland areas is represented by a varying Manning coefficient in the bottom friction term. Acquisition of the vegetation distribution is based on Landsat TM satellites by remote sensing techniques. Detailed comparisons between field observation and simulated results of water depth, salinity and tidal currents are presented in the vegetated domain of the Pink Beach wetlands. Satisfactory results were obtained from simulations of both flow characteristics and salinity concentration, with or without vegetation. A numerical experiment was conducted based on variations in vegetation density, and compared with the tidal currents in non-vegetated areas; the computed current speed decreased remarkably with an increase in vegetation density. The impact of vegetation on water depth and salinity was simulated, and the findings revealed that wetland vegetation has an insignificant effect on the water depth and salinity in this wetland domain. Several stations (from upstream to downstream) in the Pink Beach wetlands were selected to estimate the longitudinal variation of salinity under different river runoff conditions; the results showed that salinity concentration decreases with an increase in river runoff. This study can consequently help increase the understanding of favourable salinity conditions for particular vegetation growth in the Pink Beach wetlands of the Liao River estuary. The results also provide crucial guidance for related interaction studies of vegetation, flow and salinity in other wetland systems.

scholarly journals Numerical Study on the Expansion and Variation of Changjiang Diluted Water in Summer and Autumn

2021 ◽  
Vol 9 (3) ◽  
pp. 317
Author(s):  
Wanli Hou ◽  
Menglin Ba ◽  
Jie Bai ◽  
Jianghua Yu
Keyword(s):  
Yangtze River ◽  
Sea Water ◽  
Numerical Study ◽  
River Estuary ◽  
Ocean Model ◽  
Theoretical Research ◽  
Yangtze River Estuary ◽  
Hydrodynamic Characteristics ◽  
Changjiang Diluted Water ◽  
Transportation Route

In view of the expansion and directional change mechanisms of Yangtze River water diluted with sea water in the shelf region (also known as Changjiang diluted water [CDW]) during summer and autumn, a three-dimensional hydrodynamic model of the Yangtze River Estuary (YRE) and its adjacent waters was established based on the Finite Volume Community Ocean Model (FVCOM). Compared with the measured data, the model accurately simulates the hydrodynamic characteristics of the YRE. On that basis, the influence of the expansion patterns of the CDW in both summer and autumn was studied. It was found that, in 2019, the CDW expanded to the northeast in the summer and to the southeast in the autumn, and that the route of the CDW is mainly controlled by the wind, not the runoff. Current seasonal winds also change the transportation route of the CDW by affecting its hydrodynamic field. Typhoons are frequent in both summer and autumn, causing abnormalities in both the transportation route and expansion of the CDW. During a typhoon, a large amount of the CDW is transported in a continuous and abnormal manner, accelerating the path turning of the CDW. This paper enhances the existing theoretical research of the CDW and provides a reference with respect to the expansion of diluted water all over the world.

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