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Artykuły w czasopismach na temat "Saigon River"
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Balaban, J. "The Saigon River". Interdisciplinary Studies in Literature and Environment 6, nr 1 (1.01.1999): 119. http://dx.doi.org/10.1093/isle/6.1.119.
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Babel, Sandhya, Anh Tuan Ta, Thi Phuong Loan Nguyen, Emenda Sembiring, Tjandra Setiadi i Alice Sharp. "Microplastics pollution in selected rivers from Southeast Asia". APN Science Bulletin 2022, nr 1 (9.03.2022): 5–17. http://dx.doi.org/10.30852/sb.2022.1741.
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Microplastics have been found in all hemispheres of the world. However, studies on microplastics are mainly conducted in Europe, North America, and East Asia. Few studies are reported in the Southeast Asian region, where a large number of plastic waste is disposed of improperly into the water. This study investigated the abundance and characteristics of microplastics in the surface water of the Chao Phraya River (Thailand), Citarum River (Indonesia), and Saigon River (Vietnam). Samples were collected at urban and estuary zones of these rivers. The numbers of microplastics at the urban zones were 80±60, 12±6, and 68±20 items/m3 at the Chao Phraya, Citarum, and Saigon River, respectively. At the estuary zones, the numbers of microplastics were 48±8, 0±0 (0.08±0), and 42±5 items/m3 at the Chao Phraya, Citarum, and Saigon River, respectively. Microplastics with morphologies of fragments and fibres were mainly found in the rivers. Polypropylene and polyethylene particles were the most abundant in all collected samples. Since the selected rivers play important roles in water supply and aquaculture activities, the presence of microplastics in these rivers may negatively impact aquaculture and human health. Potential plastic management strategies to minimize microplastic problems in the selected rivers were also proposed in this study.
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Long, Tran Thanh, i Sucharit Koontanakulvong. "Groundwater and River Interaction Impact to Aquifer System in Saigon River Basin, Vietnam". Engineering Journal 24, nr 5 (30.09.2020): 15–24. http://dx.doi.org/10.4186/ej.2020.24.5.15.
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Since the 1990s, under the pressure of socio-economic growth in the Ho Chi Minh City and nearby provinces, the heavy-extraction of groundwater of this area has dramatically increased to meet high water demand for domestic and industrial purposes. Although the groundwater – Saigon River interaction significantly contributes to groundwater reserves, researchers have been less attentive to fully describe and understand the river recharge. This study attempts to explore the impact of groundwater-river interaction to aquifer system due to pumping increase via field seepage and (O18, H2) isotopic measurements in the Saigon River Basin, South East of Vietnam. The analysis showed that river bed conductance at 0 km, 30 km, 60 km, 80 km, and 120 km were 4.5 m2/day/m, 4.2 m2/day/m, 2.5 m2/day/m, 1.7 m2/day/m, and 0.25 m2/day/m respectively. The riverbed conductance relies on the sand percentage of sediment. The composition δO18 in groundwater, river, and precipitation indicates that river recharge to groundwater exists mainly in the lower part of the basin. In contrast to downstream, the composition of δO18 was signified that the river primarily gains water from groundwater upstream. Under pressure of developing economies, the groundwater pumping in the Saigon river basin increased from 175,000 m3/day in 1995 to 880,000 m3/day in 2017. As a consequence of the increased pumping rate, the groundwater discharge to the river decreases from 1.6 to 0.7 times of groundwater pumping in upstream, while the amount of Saigon river recharge increases by 33% to 50% of the total groundwater pumping downstream. Under the exceedance pumping rate, the aquifers in the Saigon River Basin release less water to the Saigon river and it tends to gain more water through the river - groundwater interaction process. Therefore, groundwater management in downstream aquifers needs better joint planning with surface water development plans, particularly for surface water supply utilities which still struggle to satisfy the water demand of the development plan.
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Duc, Pham Anh, i Dang Quoc Dung. "Water Quality Assessment Using Benthic Macroinvertebrates in Saigon River and Its Tributaries, Vietnam". GeoScience Engineering 62, nr 2 (1.06.2016): 15–20. http://dx.doi.org/10.1515/gse-2016-0013.
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Abstract This study to enhance the discussion about the usefulness of benthic macroinvertebrates for water quality assessment in Saigon River and its tributaries. Data from 16 sites were used as a representative example for Saigon River and its tributaries in the area of basin over 4,500 km2, the length through provinces of Tay Ninh, Binh Phuoc, Binh Duong, and Ho Chi Minh City of about 280 km. The data covered the period of dry and rainy seasons in 2015, the survey sampled 16 sites (32 events) of the Saigon River and its tributaries selected. To implement this evaluation, the analyses were based on MRC methods and classifications these improved by the scientific group. The analysis of general characteristics of benthic macroinvertebrates and bio-indices were used to examine the spatial patterns of water quality and biological groups. The value of good water quality was recorded in the sites far from industrial parks, crowded citizen areas, big cities (SG1 and SG2) while the sites in near urban Ho Chi Minh City and Thu Dau Mot Town or industrial areas (the section of Saigon River from SG6 to SG13) where had the value of worse water quality because of the more human activities. Especially, there was not any animal that was collected in the site SG7 because of too heavy pollution. The results demonstrated that these organisms could be applied to describe the ecological health in the Saigon River and its tributaries.
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Thuy, Nguyen Thi Diem, Nguyen Thi Huynh Mai i Do Quang Linh. "Assessing water quality of the Saigon River under the impact of industrial wastewater incidents". IOP Conference Series: Earth and Environmental Science 1349, nr 1 (1.05.2024): 012027. http://dx.doi.org/10.1088/1755-1315/1349/1/012027.
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Abstract The Saigon River, as its economic potential and clusters and industrial parks evolve, is threatened by a high potential for water pollution. The objective is to evaluate the water quality (BOD5 and COD) under the influence of industrial wastewater incidents in the Saigon River using MIKE 21FM model. The results of model calibration and validation have high reliability with NSE values larger than 0.65 for the flow simulation and percentage error values less than 25% for the water quality simulation. Subsequently, the study proceeds to develop hypothetical scenarios in case untreated wastewater from industrial parks is charged directly into the Saigon River with actual discharge volumes of 15,811 m3/day and 30,000 m3/day. The results indicated that when an incident occurs at a location 1.3 km upstream from the Hoa Phu pumping station with a discharge volume of 15,811 m3/day, that has the most consequential impact, in terms of time and concentration of water pollutants on the pumping station. Specifically, the water quality at the pumping station area experiences a remarkable decrease after one and three hours of incidents in the dry and rainy seasons, respectively. In general, the impacts of industrial wastewater incidents vary depending on their location. An incident beneath the Hoa Phu pumping station on the Saigon River is expected to have a faster impact on the raw water source during the dry season compared to the rainy season.
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Van, Tuan Pham, i Sucharit Koontanakulvong. "Groundwater and River Interaction Parameter Estimation in Saigon River, Vietnam". Engineering Journal 22, nr 1 (31.01.2018): 257–67. http://dx.doi.org/10.4186/ej.2018.22.1.257.
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Markova, Irina M., i Phan Khanh Khanh. "Flow velocity field of the Saigon River section during operation of flood control structures". Stroitel'stvo: nauka i obrazovanie [Construction: Science and Education] 13, nr 2 (30.06.2023): 74–90. http://dx.doi.org/10.22227/2305-5502.2023.2.5.
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Introduction. Vietnam’s largest economic centre, Ho Chi Minh City, is facing riverbank erosion, one of the main causes of which is runoff. In this study, the flow velocity field of the Saigon River section is analyzed in different time periods. Materials and methods. Data on discharge, water level, river network topography and river channel were collected to set up simulation models in the programmes MIKE 11 and MIKE 21. These programmes are the main tools used in the study. Results. The current velocity in the middle of the river is 3–4 times higher than on the two banks. However, during the period between high and low tide, the current on both sides of the river has higher speed than the main stream, especially in the upper part of the winding banks, such as the part of the river from Ben Nghe sluice to Tan Thuan sluice and the section of the river from An Loi Dong police station to Thu Thiem 2 bridge. The velocity values in the studied river section in most cases exceed the allowable erosion-free velocity values of particles of channel material, river banks, and suspended sediment particles. The operation of the flood control sluices will slightly reduce the flow velocity values and also cause whirlpools in front of the sluices. Conclusions. The MIKE 11 and MIKE 21 software detailed the flow distribution of the Saigon River. The flow velocity on the Saigon River has a complex distribution and varies from period to period depending on the flood discharge from the Dau Tieng Reservoir and the tidal currents of the East Sea. The process of erosion on both sides of the river will occur regularly and continuously, so urgent measures are needed to protect the riverbank.
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Rodrigues do Amaral, Francisco, Thierry Pellarin, Tin Nguyen Trung, Tran Anh Tu i Nicolas Gratiot. "Enhancing discharge estimation from SWOT satellite data in a tropical tidal river environment". PLOS Water 3, nr 2 (12.02.2024): e0000226. http://dx.doi.org/10.1371/journal.pwat.0000226.
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The Surface Water and Ocean Topography (SWOT) mission aims to provide essential data on river width, height and slope in order to estimate worldwide river discharge accurately. This mission offers a powerful tool for monitoring river discharge in dynamic coastal areas, like the Saigon-Dongnai estuary in Southern Vietnam. However, estimating discharge of tidally-influenced rivers using SWOT measurements can be challenging when hydraulic variables have the same order of magnitude as SWOT measurement errors. In this paper we present a methodology to enhance discharge estimation accuracy from SWOT measurements based on simulated SWOT products at the 200 meter node resolution and varying river reach size. We assess measurement error variability and its impact on discharge estimation by employing a Monte Carlo analysis. Our approach significantly improved discharge estimation in the Saigon tidal river, reducing RMSE from 1400 m3/s to 180 m3/s and increasing R² from 0.31 to 0.95. Notably, the percentage of Monte Carlo particles meeting the 30% rRMSE threshold rose from 0% to 79%. This study underscores the feasibility of obtaining reliable discharge estimates from SWOT data in complex coastal areas where hydraulic variables are of the same order of magnitude as SWOT errors. Additionally, the proposed methodology to improve discharge estimation from SWOT measurements is widely adaptable as it can be applied to similar regions and can be combined with any discharge estimation method.
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Van Ha, Nguyen Thi, Satoshi Takizawa, Kumiko Oguma i Nguyen Van Phuoc. "Sources and leaching of manganese and iron in the Saigon River Basin, Vietnam". Water Science and Technology 63, nr 10 (1.05.2011): 2231–37. http://dx.doi.org/10.2166/wst.2011.460.
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High concentrations of manganese and iron in the Saigon River are major problems for the water supply in Ho Chi Minh City (HCMC), Viet Nam. To identify their sources and leaching processes, we surveyed water quality along the Saigon River and ran batch leaching tests using soil and sediment samples. Two important leaching processes were identified: acidic leaching from acid sulfate soil (ASS) in the middle reaches of the river, and Mn dissolution and Fe reduction from sediments in the downstream reaches. Low pH caused the concurrent release of Fe and Mn from the ASS. In contrast, anoxia caused the release of Fe but not Mn from the sediments, whereas low pH facilitated Mn dissolution. Sediments are a more important source of Mn because of their higher Mn contents (10 times) and release rates (14 times) than those from ASS.
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To, Thuy Chau. "WATER QUALITY ASSESSMENT OF SAIGON RIVER FOR PUBLIC WATER SUPPLY BASED ON WATER QUALITY INDEX". Vietnam Journal of Science and Technology 58, nr 5A (12.11.2020): 85. http://dx.doi.org/10.15625/2525-2518/58/5a/15203.
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Water Quality Index (WQI) is a dimensional number that aggregates information from many water quality parameters according to a defined method. WQI is accepted as an efficient tool for water quality management. In this study, WQI of Saigon river for public water supply was calculated from nine water quality parameters including pH, suspended solids (SS), dissolved oxygen (DO), chemical oxygen demand (COD), nitrite, ammonia, phosphate, total dissolved iron and total coliform based on water quality data obtained monthly from January 2016 to December 2019 at three sampling sites. The results showed that most of WQI values belonged to class III (medium water quality with the WQIs of 35 – 64) and class IV (poor water quality with the WQIs of 11 – 34) and a deteriorating trend was observed from upstream to downstream of Saigon river. The river water quality could not be used for public water supply.
Rozprawy doktorskie na temat "Saigon River"
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Nguyen, Ngoc Trang, i not supplied. "Biomonitoring of Trace Metals in the Saigon River". RMIT University. Applied Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080102.144317.
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This study investigated trace essential metals (Cu, Zn and Cr) and non-essential metals (Pb, Cd and Hg) in water, sediment and tissues of water spinach, snake head fish and swamp eel from the Saigon River. Sampling was conducted from January to December 2004 at three sites. Three water and sediment samples, edible parts of twenty water spinach (Ipomea aquatica) samples (leaves and stems), twenty snake head fish (Channa striata) and twenty swamp eels (Monopterus albus) were collected at each site. Water, sediment and biota tissues were analysed for Cu, Zn, Cr, Pb, Cd and Hg following the method of USEPA, AOAC and NFTA. Results showed that Cu, Zn, Cr, Cd and Hg in water from the river was not higher than the maximum permitted level for protection of aquatic life by the national standards while the average Cu concentration in sediment was found to be close to the Effects range- low value and within the slightly polluted range (25- 50 ìg.g-1 dry weight). The results also showed that the river sediment was considered to be contaminated by Zn and Hg in comparison with contaminated sites in Australia and in Thailand. In water spinach, no Cu deficiency was found but Zn was accumulated. No accumulation of Cr, Cd and Hg was revealed but Pb was detectable. The results indicated that snake head and eel may have Cu deficiencies. Pb and Hg were found to be bioaccumulated in the muscle of snake head and eel at some sites on some occasions, but the levels were small. The results showed that metal in sediment liver of snake head muscle of snake head and eel water. The metals in water spinach decreased in the order Zn Cu Cr Pb Cd and Hg; in snake head the metal concentrations decreased in the order Zn Cu Cr PbHgCd and in eel as Zn Cu Cr PbCd and Hg. The ANOVA test showed no significant relationship between metals in the water and sediment and biota. Therefore it was concluded that the metals in the selected biota samples did not reflect the metals in the environment. The essential metals Cu, Zn and Cr were found to decrease at the end of the dry season and then increase at the end of the rainy season. The seasonal variations of metals in the river and biota maybe a result of the change of temperature in the area and the need for essential metals in the reproduction of fish. The results of this study clearly demonstrates that water spinach, snake head fish and swamp eel are not potential bio-indicators for metals in the Saigon River since they did not reflect concentrations of metals in their environment. It was also concluded based on consumption rates that water spinach, snake headfish and eel from the Saigon River do not present any potential health risk to consumers. However, attention should be paid to controlling the load of pollutants entering the river to avoid such risks and future problems.
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Nguyen, Thi Ngoc Tuyet. "Risk of eutrophication in the Saigon River : Impacts of the Ho Chi Minh Megacity (Vietnam)". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAU049/document.
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La rivière Saigon, qui constitue un sous bassin du fleuve Nha Be, est située dans le sud du Vietnam. Cette rivière a une longueur d'environ 250 km et le bassin versant total à une surface de 4717 km2. Le réservoir de Dau Tieng, situé en amont de la rivière Saigon, a été construit pour mieux gérer l’irrigation, lutter contre les inondations et contrôler l’intrusion d’eau salée. En traversant HCMC, la rivière Saigon est connectée à plusieurs canaux puis rejoint la rivière Dongnai pour devenir le fleuve Nha Be qui traverse la zone de mangrove de Can Gio et se jette dans la mer de l'Est. La rivière Saigon et son bassin versant sont situés dans la plaine côtière et sont soumis au balancement quotidien des marées.L'objectif général de cette thèse est (i) d’évaluer l'état trophique de la rivière Saigon - Dongnai, (ii) d’étudier les processus à l’origine de la dynamique des nutriments, en particulier le rôle des sédiments en suspension, du mélange turbulent et du gradient de salinité, afin d'estimer la capacité de rétention par rapport aux flux d'éléments nutritifs; (ii) d’utiliser ces mesures de terrain et de laboratoire pour envisager une simulation numérique de ce système estuarien.La première étape de cette thèse a consisté en une étude des concentrations en nutriments (N, P, Si) sur quatre sites d’échantillonnage dans le système de la rivière Saigon – Dongnai. Les mesures ont été réalisées deux fois par mois de juillet 2015 à décembre 2017 pour évaluer les niveaux de concentration en éléments nutritifs et l’état d’eutrophisation. Cette thèse a mis en évidence un excès de nutriments dans HCMC avec des concentrations de NH4+ et de PO43- atteignant en moyenne 0.7 mgN L-1 et 0.07 mgP L-1, respectivement. Nous avons observé que des rejets domestiques non traités entraînaient une dégradation de la qualité de l’eau de la rivière Saigon, avec une valeur extrême de biomasse algale (150 µChl-a L-1) et des périodes d’hypoxie (DO < 2 mg L-1), principalement en saison sèche. L’eutrophisation de la rivière dans la zone urbaine dense n'a pas d'effet clair en aval, car la masse d'eau eutrophie de la rivière Saigon est efficacement mélangée avec les masses d'eau de mer et de la Dongnai pendant chaque cycle de marée. Ce qui met en évidence le rôle tampon (capacité de métabolisation) de l’estuaire entre les apports amont et la mer.Sur la base d'enquêtes de terrain et d’expérience en laboratoire, nous avons évalué les causes de l'eutrophisation de la rivière et étudié la capacité d'adsorption-désorption du phosphore sur les sédiments en suspension dans le gradient de salinité. Les enquêtes sur le terrain ont montré un impact clair de la mégapole, le P total augmentant de trois fois dans le centre de HCMC, par rapport aux valeurs en amont. En aval, dans la zone estuarienne mélangée par des marées, le P total descend à moins de 0.5 gP kg-1. Les expériences en laboratoire ont montré le rôle clé de la concentration en sédiments cohésifs en suspension sur la capacité d’adsorption de P sur les particules dans le gradient de salinité.Dans cette thèse, nous avons également analysé une base de données des nutriments, des sédiments en suspension et des rejets d’eau de 2012 à 2016 (données du service de surveillance de la qualité de l’eau vietnamien de la province d’HCMV). Neuf sites le long de la rivière Saigon et un site dans la rivière Dongnai ont permis de déterminer l’état de référence à l’amont et à l’aval d’Ho Chi Minh Ville. Les flux calculés permettent de dresser un premier bilan sédimentaire et nutritif à l’échelle des fleuves Saigon – Dongnai, de discuter de la contribution de chaque sous bassin aux flux totaux et de dresser des hypothèses sur l’état géomorphologique et environnemental actuel et futur des zones estuariennes et côtièresThe Saigon River, a part of Saigon – Dongnai River basin located in Southern Vietnam, is about 250 km long with a catchment area of 4,717 km2. The Dau Tieng reservoir in the upstream of the Saigon River has been constructed for irrigation, flood protection purposes and the control of the intrusion of saline water. When flowing through HCMC, Saigon River is connected with canals and then joins Dongnai River to become the Nha Be River flowing through Can Gio Mangrove to the East Sea. Draining a low elevation coastal zone (LECZ), Saigon River is affected by the asymmetric semi-diurnal tides.The general goal of this thesis is to (i) assess trophic status in the Saigon – Dongnai River, (ii) assess the processes that lead nutrient behavior in the salinity gradient to estimate retention capacity with respect to the nutrients fluxes and (iii) calculate nutrient budgets to further be used for numerical simulations.The first step of this thesis consisted in a survey of nutrient concentrations (N, P, Si) at four sampling sites within the Saigon – Dongnai River system, which was carried out bi-monthly from July 2015 to December 2017, allowing to quantify the levels of nutrient concentrations and of indicators of eutrophication. This thesis pointed out an excess of nutrients in HCMC with concentrations of NH4+ and PO43- averaging to 0.7 mgN L-1 and 0.07 mgP L-1, respectively. We observed that untreated domestic discharges lead to the degradation of Saigon River’s water quality with extreme value of algal biomass (up 150 µChl-a L-1) and hypoxia conditions occurring episodically (DO < 2 mg L-1) during dry season. The eutrophic issue in the city center has no clear effect downstream because eutrophic water mass from Saigon River is efficiently mixed with Dongnai and sea water masses during the semi-diurnal tidal cycle, leading to efficient metabolism of nutrients within the estuarine partBased on field and laboratory surveys, we assessed the eutrophication of the river, and investigated P adsorption-desorption capacity onto suspended sediment (SS) within the salinity gradient. Field surveys showed a clear impact of the megacity, total P increasing three fold in HCMC center, as compared with upstream values. Downstream, in the tidally mixed estuarine area, the total P lowered to less than 0.5 gP kg-1. Laboratory experiments were carried out to characterize the influence of SS concentrations, salinity and turbulence on sorption/desorption processes. Among these observed variables, SS concentration was shown to be the main driver for adsorption capacity of P onto SS in salinity gradient. This underlines the role of cohesive sediment dynamics, as an important driver of nutrient dynamic in this estuarine river system.In this thesis, we analyzed the nutrients, suspended sediments and water discharges database from the Vietnamese Center of Monitoring of the Department of Natural Resources and Environment (period 2012 to 2016). Nine sites along the Saigon River and one site in the Dongnai River were used to identify the reference water status before HCMC and the increasing fluxes from upstream to downstream. The calculated fluxes allow drawing a first sediment and nutrients budget at the scale of the Saigon – Dongnai Rivers and discussing the contribution of each sub basins to the total fluxes to the estuarine and coastal zones. Add one sentence pointing out the main result of this 2005-2016 dataseries analysis
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Nguyen, Thi Tuyet Nga. "Analysing the effect of industrial and urban polluted zones on microbial diversity in the SaiGon -DongNai river system (Vietnam)". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS582/document.
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Le système fluvial Saigon-Dong Nai (SG- DN) est la plus importante source d'eau pour les douze villes et provinces du sud du Vietnam. Il est aujourd'hui gravement pollué par les activités humaines, agricoles, industrielles et domestiques, constituant une menace pour la vie de millions de personnes. Le ministère vietnamien des Ressources naturelles et de l'environnement a rapporté que les rivières ont reçu environ 1,54 milliard de litres d'eaux usées provenant de 70 parcs industriels par jour, dont 35% de déchets médicaux non traités, et que des tests effectués depuis 2006 ont montré des niveaux élevés de pollution, en particulier de substances toxiques organiques. Jusqu'à présent, il n'y a pas de données sur la diversité microbienne dans le système fluvial SG-DN, en particulier dans les sédiments, où la plus grande partie de la biomasse microbienne est généralement localisée. Les échantillons de sédiments ont été recueillis, réseau hydrographique national SG-DN, à 13 endroits dans les rivières représentant des emplacements pollués. Afin de caractériser les populations microbiennes présentes sur nos sites choisis, l'ADN total des échantillons environnementaux a été extrait et amplifié dans les régions V3 à V1 de l'ADNr 16S. L'étude a révélé que la population microbienne changeait de l'amont vers l'aval au niveau du phylum, du genre et de l'OTU après avoir traversé la zone de population industrielle et dense. De plus, les canaux du bassin versant SG-DN sont fortement pollués par de fortes concentrations de composés organiques (PAH) et possèdent différentes communautés bactériennes par rapport aux échantillons des rivièresThe SaiGon-DongNai (SG-DN)river system is the most important major water source for all twelve Southern Vietnam cities and provinces and is now dramatically polluted by industrial and living activities, giving “a threat” to the lives of millions people sharing this water source. The Ministry of Natural Resources and Environment of Vietnam reported that the rivers received around 1.54 billion liters of waste water from 70 industrial parks per day, including 35 percent of untreated medical waste, and tests since 2006 have found pollution in this river has increased to “serious levels”, an especially high concentration of organic toxic substances. Until now, there is no data on the microbial diversity in SG-DN river system especially in the sediments, where most of the microbial biomass is generally located. The sediment samples were collected in 13 locations across the rivers representing warning polluted locations done by Mr. Nguyen Thanh Hung of the National Water Qualifying in SG-DN river system. In order to characterize the microbial populations present at our chosen sites, the total DNA from the environmental samples were extracted and amplified at the V3 to V1 regions of the 16S rDNA. The study revealed that microbial population changed from upstream to downstream at the phylum, genus and OTUs levels after running through the industrial and dense population zone. Moreover, the canals of the SG-DN river catchment are heavily polluted with high concentrations of organic compounds (PAHs) and possessed different bacterial communities compared to the samples from the rivers
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Luu, Viet Hung. "Étude du champ électromagnétique et interprétation de données magnétotelluriques au Vietnam". Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112350.
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Ce travail de thèse est consacré à l’étude de la structure électrique de la croûte terrestre dans deux régions du Vietnam, au Nord dans le delta du Fleuve Rouge et au Sud dans la région de la faille de la Rivière Saigon, et en Afrique de l’Ouest, où les données utilisées sont celles acquises durant l’Année Internationale de l’Electrojet Equatorial (AIEE). La technique utilisée est celle du sondage magnétotellurique. Deux des régions étudiées (le sud du Vietnam et l’Afrique de l’Ouest) sont situées au voisinage de l’équateur magnétique. Du fait de la présence de l’électrojet équatorial, l’hypothèse de l’onde plane, sur laquelle est basée la magnétotellurique, n’y est vérifiée que pour une gamme de périodes limitée. La modélisation de l’induction par un électrojet gaussien nous a permis de caractériser l’effet de source associé à l’électrojet équatorial, et de déterminer pour chacune des zones étudiées les gammes de périodes pour lesquelles cet effet de source est négligeable. Nous avons par ailleurs montré que l’effet de source associé à l’électrojet équatorial dépend des principales caractéristiques de la structure électrique du sous-sol, et de la distance entre le centre de l’électrojet équatorial et la position examinée. Dans le delta du fleuve Rouge, le profil magnétotellurique est orienté SO-NE. Long d’environ 32 km, il recoupe les failles majeures du système de failles du Fleuve Rouge. Les données magnétotelluriques ont été inversées pour obtenir une coupe transversale de résistivité électrique pour les trois premiers kilomètres. Cette coupe de résistivité électrique et une coupe de densité obtenue par modélisation des données gravimétriques acquises le long du même profil, ainsi que des informations déduites de forages effectués au voisinage du profil ont été utilisées pour proposer une coupe géologique de la région étudiée. Dans la région de la faille de la Rivière Saigon, le profil magnétotellurique, long d’environ 15 km, recoupe le trajet supposé de la faille. La structure électrique des premiers kilomètres de la croûte a été déterminée par inversion 2-D des données pour les gammes de périodes qui ne sont pas affectées par l’électrojet équatorial (< 0,7 s). La coupe transversale de résistivité électrique ainsi obtenue nous a permis de proposer une nouvelle localisation de la faille de la Rivière Saigon, à la limite entre un domaine résistant, le bloc de Da Lat au nord-est, et un domaine moins résistant, le bloc de Can Tho au sud-ouest. Cette nouvelle localisation est à environ 2,2 km au sud-ouest de la localisation généralement supposée pour cette faille. En Afrique de l’Ouest, nous avons montré que les données de jour sont affectées par l’électrojet équatorial pour toute la gamme de période étudiée (>120 s); ces données n’ont donc pas été utilisées pour déterminer la structure électrique de la croûte et du manteau supérieur. L’inversion 2-D des données de nuit, montre la présence d’une structure subverticale, relativement conductrice, qui sépare le Craton Ouest-africain très résistant des terrains situés sous le bassin du fleuve SénégalThis thesis is devoted to the study of the electrical structure of the Earth’s crust in two regions of Vietnam (the Red River Delta in the north and the region of the Saigon River fault in the south) and in West Africa. The data were those acquired during the International Year of the Equatorial Electrojet (IYEE). The technique used is the magnetotelluric (MT) sounding method. Two of the regions studied (southern Vietnam and West Africa) are located near the magnetic equator. Due to the presence of the equatorial electrojet in these regions, the assumption of plane wave, on which MT relies, is valid for a limited range of periods. Modeling of the induction by a Gaussian electrojet allowed us to characterize the source effect associated with the equatorial electrojet, and to determine for each studied region the period ranges for which the source effect is negligible. We have also shown that the source effect associated with the equatorial electrojet depends on the main features of the electrical structure of the basement, and the distance between the center of the equatorial electrojet and the location of the considered station. In the Red River Delta at the north, the MT profile is oriented SW-NE. It is about 32 km long, and goes across the major faults of the Red River fault system. MT data were applied 2-D inversion to obtain a electrical cross-section for the first three kilometers of the crust. This electrical cross-section, a density cross-section obtained by modeling of gravity data collected along the same profile, and information derived from holes drilled in the vicinity of the profile, both were used to construct a geological section of the study area. In the region of the Saigon River fault, the magnetotelluric profile is about 15 km long. It goes across the supposed location of the fault. The electrical structure of the first three kilometers of the crust was determined by 2-D inversion of data for periods which are not affected by the equatorial electrojet (< 0.7 s). The electrical cross-section obtained allowed us to propose a new location for the Saigon River fault; it corresponds to the boundary between a resistant domain, the block of Da Lat in the north-east, and a less resistant domain, the block of Can Tho in the south-west. This new location is about 2.2 km southwest of the location currently assumed for this fault. In West Africa, we have shown that electromagnetic impedances derived using day time data are affected by the equatorial electrojet for the whole range of period studied (> 120 s), so these data have not been used to determine the electrical structure of the crust and the upper mantle. The 2-D inversion of nighttime data shows the presence of a subvertical structure, relatively conductive, which separates the West African Craton which is very resistant from the geological structures beneath the Senegal River basin
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Nguyen, Hoang Anh [Verfasser], i Otto [Akademischer Betreuer] Richter. "A model for predicting mangrove forest dynamics under variable environmental conditions – A Case study of the Estuary of Dongnai – Saigon River system, Vietnam / Hoang Anh Nguyen ; Betreuer: Otto Richter". Braunschweig : Technische Universität Braunschweig, 2011. http://d-nb.info/1175825484/34.
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Truong, Quoc Thanh. "Etude géophysique de l'aquifère peu profond du district rural de Cu Chi et de sa vulnérabilité, région de HoChiMinh City, Viet Nam". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALU005.
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La région de Ho Chi Minh Ville (HCMV), dans le sud du Viet Nam, est confrontée à des défis importants liés au changement climatique et à la subsidence, avec des inondations plus fréquentes et la menace d'une intrusion d'eau salée. En tant que mesure proactive pour l'atténuation et les développements futurs, on doit accorder une attention particulière à la durabilité des ressources en eaux souterraines. Le nord-ouest, caractérisé par un terrain élevé et identifié comme la zone de recharge régionale, est désigné comme une réserve d'eau souterraine potentielle cruciale pour l'avenir.L'objectif premier de cette recherche est de mieux comprendre les ressources en eaux souterraines peu profondes et leur vulnérabilité face aux pratiques humaines. Le second objectif est d'évaluer plusieurs méthodes géophysiques pour l'hydrogéologie dans le contexte géologique sédimentaire de la région de la rivière Saigon. Une étude géophysique approfondie a été menée sur le terrain à l'aide de méthodes électromagnétiques dans le domaine temporel (TDEM) et le domaine fréquentiel (FEM) et de tomographie de résistivité électrique (ERT), méthodes dont la sensibilité à la détection des couches argileuses a été évaluée avant d’aller sur le terrain à l'aide d'une modélisation numérique. Ces méthodes se sont avérées efficaces pour caractériser la géométrie de l'aquifère et du système aquitard jusqu'à une profondeur de 150 mètres pour la méthode TDEM, très sensible à la présence de couches électriquement conductrices. La recherche a révélé que l'absence de couche d'argile en surface, ce qui facilite la recharge de la nappe phréatique, et cette situation présente un risque facilité d'infiltration des polluants de surface vers l'aquifère. En outre, les couches d'argile plus profondes sont discontinues, ce qui accroît la vulnérabilité à la propagation des contaminants vers le bas. Les recherches ont également abouti à un nouveau modèle conceptuel de l'aquifère impliquant des scénarios géologiques de transgression-régression pour expliquer la distribution spatiale des aquitards argileux, qui révèlent en profondeur les méandres et les plaines d'inondation de l'ancienne rivière Saigon.De manière innovante, la méthode de Résonance Magnétique Nucléaire (RMN) a également été employée à l'échelle du laboratoire pour classifier l'aquifère à l'aide de carottes extraites d'essais de forage. Associés à l'analyse de la taille des grains, les résultats de RMN montrent que l'aquifère peu profond est à grains fins. Comme la RMN à l'échelle du terrain n'a pas pu être employée avec succès en raison de conditions de bruit élevées, les analyses avec des essais de pompage et de traçage ont fourni des données supplémentaires, ce qui permet de conclure que les résultats de la RMN sont encore préliminaires car plusieurs améliorations doivent être apportées en ce qui concerne la réduction du bruit et la détermination du rendement spécifique.Pour l'avenir, la recherche ouvre la voie à la construction de modèles hydrodynamiques en 3D pour planifier une exploitation durable. Les modèles de la zone vadose faciliteront également l'évaluation de la pollution dans la nappe phréatique. Enfin, cette recherche met en évidence l'efficacité des méthodes géophysiques basées sur la résistivité pour la caractérisation des aquifères sédimentaires peu profonds dans la région de la rivière Saigon et de Ho Chi Minh Ville. Combinées aux méthodes hydrogéologiques, les futures études géophysiques permettront de relever les défis futurs liés aux eaux souterraines et contribueront à la résilience du sud du Vietnam face aux effets du changement climatiqueHo Chi Minh City (HCMC) region in the south of Vietnam faces significant challenges from climate change and subsidence, with more frequent flooding, and threat of saltwater intrusion. As a proactive measure for future mitigation and development, particular attention is being paid towards sustainable groundwater resources. The northwest, characterized by high terrain and identified as the regional recharge area, is earmarked as a potential crucial groundwater reserve for the future.The primary objective of this research is to understand better shallow groundwater resources and their vulnerability to human practices. The second objective is to evaluate several geophysical methods for hydrogeology in the sedimentary geological context of the Saigon River area. An extensive geophysical field investigation was conducted using Time-Domain Electromagnetic (TDEM), Frequency Electromagnetic (FEM), and Electrical Resistivity Tomography (ERT) methods, being evaluated for their sensitivity to clayey layer detection using numerical modeling prior to the survey. These methods proved effective in characterizing the geometry of the aquifer and aquitard system to a depth of 150 meters for TDEM method, very sensitive to electrically conductive clayey layers. The research revealed that the absence of a surface clay layer thus facilitates groundwater recharge, posing a risk of surface pollutants easily infiltrating the aquifer. Moreover, deeper clay layers are discontinuous, increasing the vulnerability to the downward spread of contaminants. The research also points towards a new conceptual model of the aquifer involving geological transgression-regressions scenarios to explain the spatial distribution of the clayey aquitards, showing meanders and floodplains of the ancient Saigon River at depth.Innovatively, the Nuclear Magnetic Resonance (NMR) method was also employed at the laboratory scale to classify the aquifer using core extracted from boreholes tests. Coupled with grain size analysis, the results show that the shallow aquifer is fine-grained. As field-scale NMR was unsuccessfully applied due to high noise conditions, analyses with pumping and tracer tests gave additional data, leading to the conclusion that NMR results are still preliminary as several improvements have to be made regarding noise reduction and specific yield determination.For the future, the research paves the way for constructing 3D hydrodynamic models for sustainable exploitation. Vadose zone models will also facilitate the evaluation of pollution in the water table. Finally, this research highlights the efficiency of resistivity-based geophysical methods for sedimentary shallow aquifers characterization in Saigon River and HCMC regions. Combined with hydrogeological methods, future geophysical studies will help to address future groundwater challenges and contribute to the south of Vietnam’s resilience against climate change impacts
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Décriaud, Anne-Sophie. "Les personnifications cosmologiques sur les mosaïques romaines tardives d’Orient. Traditions iconographiques et lecture symbolique". Thesis, Paris 4, 2013. http://www.theses.fr/2013PA040043.
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L’une des questions primordiales dans l’étude de l’Antiquité tardive concerne le passage de l’ancienne religion polythéiste au christianisme. Or, les découvertes archéologiques faites dans la partie orientale du Bassin méditerranéen ont révélé de nombreux pavements chrétiens (ou juifs) tardifs décorés de riches mosaïques polychromes réutilisant des figures issues de la tradition iconographique grecque, parmi lesquelles des personnifications d’éléments cosmologiques. On rencontre ainsi des éléments du temps, comme les quatre Saisons (Tropai) ou les Mois (Ménès), la Terre (Gê) parfois accompagnée de ses Fruits (Karpoi), certains astres comme le Soleil (Hélios), la Lune (Séléné), parfois accompagnés du Zodiaque, l’Élément marin féminin (Thalassa) ou masculin (Okéanos, Abyssos) et les quatre Fleuves du Paradis (Géon, Phison, Tigre et Euphrate). Cette présente thèse se propose d’étudier chacune de ces personnifications, leur iconographie et leur symbolique, en contexte religieux, mais aussi profane, dans une analyse stylistique et comparative. Cette étude a ainsi pour but de mettre en relief la spécificité de cette partie orientale de l’Empire romain, entre le IVe et le VIe siècle, et d’insister sur la pérennité de la culture grecque et de ses traditions iconographiques, malgré un changement de religion officielleOne of the primordial questions in the study of Late Antiquity concerns the transition from the ancient polytheistic religion to Christianity. The archaeological discoveries that have been made in the Eastern part of the Mediterranean Basin have revealed a number of late Christian (or Jewish) pavements decorated with rich polychrome mosaics that reuse figures stemming from the Greek iconographic tradition, which include personifications of cosmological elements. In this manner elements of time can be encountered, such as the Four Seasons (Tropai) or the Months (Menes), the Earth (Ge) sometimes surrounded by her Fruits (Karpoi), specific celestial bodies such as the Sun (Helios), the Moon (Selene), sometimes accompanied by the Zodiac, the female marine Element (Thalassa) or the male (Okeanos, Abyssos) and the four Rivers of Paradise (Geon, Phison, Tiger and Euphrates). This thesis makes a stylistic and comparative analysis of each of these personifications, their iconography and their symbolism, in a religious context, but also in a secular one. The object of this study is to emphasise the specificity of the Eastern part of the Roman Empire between the Fourth and the Sixth centuries. And also to insist in particular on the longevity of the Greek culture and its iconographic traditions, despite an official change in religion
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Galantini, Lisa. "Facteurs spatio-temporels influençant les gaz à effet de serre en rivière tempérée". Thesis, 2020. http://hdl.handle.net/1866/25152.
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Le dioxyde de carbone (CO2), le méthane (CH4) et l’oxyde nitreux (N2O) sont trois des principaux gaz à effet de serre (GES) influençant les changements climatiques (IPCC, 2014). La variabilité des concentrations fluviales de ces GES est souvent liée à l’utilisation du territoire, aux caractéristiques internes de la rivière et au régime hydrique. Cependant, peu d’études se sont penchées sur l’influence de ces facteurs sur la dynamique couplée de ces trois gaz au fil des saisons. Pour cette étude, nous avons mesuré les concentrations et flux de CO2, CH4 et N2O le long d’une rivière tempérée : la Rivière du Nord, une fois par saison durant trois années consécutives. Le long du bassin versant de cette rivière la géologie diffère entrainant un changement radical d’utilisation du territoire. De fortes différences saisonnières ont été observées : les concentrations de CO2 et N2O étaient plus élevées en hiver, tandis que celles de CH4 étaient plus importantes l’été. Les sites de confluence majeure avaient les émissions les plus élevées. Les concentrations ont été influencées par l’utilisation des terres, les plus fortes concentrations de tous les GES se trouvant où les activités urbaines et agricoles sont les plus intensives. Cependant, la variabilité spatiale fut minimisée pendant les périodes de fort débit. Bien que l’utilisation du territoire ait influencé la variabilité spatiale des concentrations le long de la rivière, les changements de températures et de régime hydrique provoqués par les saisons ont influencé, respectivement, l’importance relative des gaz et leurs concentrations et émissions globales.Carbon dioxide (CO2), methane (CH4), and nitrous dioxide (N2O) are three of the main greenhouse gases (GHGs) that influence climate change (IPCC, 2014). Variability in the riverine concentrations of these three GHGs is often related to land use, within river features, and hydrologic regimes. However, few studies have looked at the interacting influence of these factors on the coupled dynamics of these gases across seasons. Here, we measured CO2, CH4, and N2O concentrations and fluxes along a 146.6 km stretch of the main stem of a north temperate river, with a change in geology resulting in a sharp shift in land use once per season for three consecutive years. Strong seasonal differences in gas concentrations were observed: CO2 and N2O were both higher overall during winter but were occasionally undersaturated, whereas summer had the highest concentrations of CH4. Sites of major confluence had the highest emissions, acting as vents. Concentrations were influenced by land use, with the highest concentrations of all gases found in the lower reaches where urban and agricultural activity are most intensive. However, spatial variability was minimized during periods of high flow when the river acted more like a pipe. This suggests that how major gases are coupled is largely a function of differential processes across seasons. Although land use influenced the spatial variability in concentrations along the river, seasonal changes in temperature influenced the relative importance of the gases, and hydrology mediated their overall concentrations and emissions.
Książki na temat "Saigon River"
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Shakai o utsusu kawa: Saigai tahatsu jidai no shizen gijutsu bunka. Tōkyō: Sankaidō, 2007.
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Januke, ijin, kodama: Rekishi saigai to denshō. Tōkyō: Iwata Shoin, 1994.
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Zaidan, Kasen Kankyō Kanri, red. Ryūboku to saigai: Hassei kara shori made. Tōkyō: Gihōdō Shuppan, 2009.
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Japan. Sekiyu konbinato to saigai boshi horeishu. Wyd. 8. Daiichi Hoki, 1996.
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Dick, Howard, i Peter J. Rimmer. "River Cities: Bangkok, Rangoon and Saigon". W Cities, Transport and Communications, 289–318. London: Palgrave Macmillan UK, 2003. http://dx.doi.org/10.1057/9780230599949_9.
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Pham, Tuan Dang, Minh Huy Nguyen i Thu Ha Nguyen. "Microplastic Removal Time in Saigon River". W Lecture Notes in Civil Engineering, 1037–45. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3303-5_95.
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Long, Tran Thanh, Sucharit Koontanakulvong i Phu Nhat Truyen. "Estimation of Sustainable Aquifer Yields in the Saigon River Basin". W Lecture Notes in Civil Engineering, 1029–36. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3303-5_94.
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Aygun, Okan, Andreja Jonoski i Ioana Popescu. "Salinity Control on Saigon River Downstream of Dautieng Reservoir Within Multi-objective Simulation-Optimisation Framework for Reservoir Operation". W Lecture Notes in Computer Science, 329–45. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22747-0_26.
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Harms, Erik. "Concrete Ecology: Covering and Discovering Saigon’s Ecology in a Time of Floods". W Death and Life of Nature in Asian Cities, 159–76. Hong Kong University Press, 2021. http://dx.doi.org/10.5790/hongkong/9789888528684.003.0009.
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Across the Saigon River from Ho Chi Minh City’s Central Business District, a large-scale New Urban Zone is being built on heavily engineered land requisitioned from thousands of dispossessed households. Before the project began, neighborhoods at the site were nestled within tidal wetlands and verdant waterways. The neighborhoods have since been demolished and the wetlands filled to accommodate the New Urban Zone. Despite the radical transformation of the site’s wetland ecology, architects and planners charged with designing the project claim to have discovered the southern Vietnamese ecosystem. They also highlight the purported sustainability of the project, even though it entails covering large expanses of that ecosystem in concrete. This chapter discusses the tension between discovering ecology and covering it up. In the process, it contrasts a pseudo-scientific language of sustainability and ecology project designers use to justify the project with peer-reviewed urban science and local knowledge about Saigon’s riverine ecology.
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Whitman, Walt. "Two Hours on the Minnesota". W Specimen Days. Oxford University Press, 2023. http://dx.doi.org/10.1093/owc/9780198861386.003.0171.
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From 7 to 9, aboard the United States school-ship Minnesota, lying up the North river. Captain Luce sent his gig for us about sundown, to the foot of Twenty-third street, and receiv’d us aboard with officer-like hospitality and sailor heartiness. There are several hundred...
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"The River Niger 1826 a gamester throwing his last stake". W A Sailor in the Sahara. I.B.Tauris, 2008. http://dx.doi.org/10.5040/9780755624898.ch-017.
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Bakin, Kyokutei. "Preface to the Lives of the Eight Dog Warriors, Volume II". W Eight Dogs, or "Hakkenden", tłumacz Glynne Walley, 209–10. Cornell University Press, 2021. http://dx.doi.org/10.7591/cornell/9781501755170.003.0017.
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The author stores up in his breast the novel tales of the collectors of petty histories. At first he considers all manner of karmic causes and effects, and when he is unable to grasp one, he is left nonplussed, directionless in his heart, like a tiny boat tossed on the vast green ocean. When he gets the intent, however, he sails like a leaf on the wind, rejoicing within himself. He sees things no one has seen, and knows things no one knows. In this way there is nothing he dares not write concerning peace and war, gain and loss, nothing he dares not record concerning the ways of the world; and, after spending some length of time compiling his materials, he finally puts them into a book. He is like a sailor who drifts for thousands of leagues before reaching an isle in the sea, where he chances to meet an immortal who teaches him the secrets of wizardry and then allows him to return and proclaim them to his fellow men. However, it is as in the old story of the raft-rider who visited Peach Blossom Spring...
Streszczenia konferencji na temat "Saigon River"
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Tran, Long T., i Y. Q. Nguyen. "Simulation of the spatial distribution of hydraulic conductivity in Saigon river basin". W THE 1ST INTERNATIONAL CONFERENCE ON INNOVATIONS FOR COMPUTING, ENGINEERING AND MATERIALS, 2021: ICEM, 2021. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0068368.
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Giang, N. V. "Characteristics of Sedimentary Structure of Mekong and Saigon River Banks by Geophysical and Geological Data". W Near Surface 2008 - 14th EAGE European Meeting of Environmental and Engineering Geophysics. European Association of Geoscientists & Engineers, 2008. http://dx.doi.org/10.3997/2214-4609.20146338.
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An, Truong Thai Hoai, i Tran Thi Viet Ha. "Public space in Truong Tho city – A part of Saigon river, Hochiminh city. A compromise between new developments and old values". W PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON FRONTIER OF DIGITAL TECHNOLOGY TOWARDS A SUSTAINABLE SOCIETY. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0124723.
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Chambon, Grégory. "Sailing safely along rivers and canals in the Amorite period". W Le château de mon père – My home my castle. University of West Bohemia, Czech Republic, 2023. http://dx.doi.org/10.24132/zcu.2023.11672-29-40.
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Les deux grands fleuves que sont l’Euphrate et le Tigre, ainsi que les multiples canaux qui les rejoignent constituaient dès le troisième millénaire av. J.-C. des voies privilégiées pour le transport des biens et des gens ainsi que les échanges culturels et économiques. Les archives retrouvées dans la ville de Mari et dans divers sites de la Mésopotamie du Sud nous fournissent ainsi un grand nombre d’informations sur la navigation, même si elles sont le plus souvent parcellaires. Les fleuves constituaient des espaces orientés (de l’amont vers l’aval) et dynamiques (avec des courants plus ou moins violents selon les saisons) qui traversaient des territoires ou servaient de frontières. Bien que les autorités aient toujours cherché à maîtriser les fleuves pour l’agriculture, ils étaient le lieu de multiples activités (pêche, chasse, transport de denrées précieuses ou de personnages prestigieux, mouvement de troupes ennemies…) qui échappaient bien souvent à tout contrôle et généraient de l’insécurité. Cet article se propose d’étudier la façon dont les particuliers ou bien les dirigeants des grands organismes (palais ou temple) de l’époque amorrite se représentaient cette insécurité, et les moyens qu’ils cherchaient à mettre en œuvre pour y répondre, révélant ainsi un rapport complexe mais étroit entre les voies fluviales et les hommes.