Distribution and Influencing Factors of Arsenic in Groundwater - Based on the Riverside Groundwater Source Field of some Northern City, China

2011 ◽  
Vol 71-78 ◽  
pp. 2953-2956
Author(s):  
Ying Jie Sun ◽  
Gang Wang ◽  
Mou Lu ◽  
Bo Fu ◽  
Ying Chen ◽  
...  
Keyword(s):  
Water Level ◽  
Influencing Factors ◽  
Yellow River ◽  
Arsenic Concentration ◽  
Vertical Direction ◽  
Source Field ◽  
Arsenic In Groundwater ◽  
Groundwater Samples ◽  
Groundwater Source ◽  
Northern City

The purpose of this study was to evaluate the geological and anthropogenic aspects of As pollution in groundwater of Northern Suburb Groundwater Source Field in Zhengzhou, China. Based on the groundwater samples of 78 wells in the groundwater source field of some northern city in China, distribution and influencing factors of arsenic were analyzed. The results show that: in the horizontal direction, the arsenic concentration outside beach is higher than that inside; the arsenic concentration presents the regional and continual distribution in the east area and west area, respectively. The arsenic concentration was reduced along with the increase of depth in the vertical direction. Arsenic concentration has significantly correlations with pH, Fe, Mn, SO42- and the water level of Yellow River, respectively (r = 0.5011, 0.7302, 0.6231, -0.5222 and -0.7671), which are the primary influencing factors on the mobilization and transform of arsenic in the groundwater.

scholarly journals High-Arsenic Groundwater in Paleochannels of the Lower Yellow River, China: Distribution and Genesis Mechanisms

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 338
Author(s):  
Chuanshun Zhi ◽  
Wengeng Cao ◽  
Zhen Wang ◽  
Zeyan Li
Keyword(s):  
Yellow River ◽  
The Yellow River ◽  
Rock Interaction ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Groundwater Samples ◽  
Groundwater Systems ◽  
Different Sources ◽  
High Arsenic ◽  
High Arsenic Groundwater

High–arsenic (As) groundwater poses a serious threat to human health. The upper and middle reaches of the Yellow River are well–known areas for the enrichment of high–arsenic groundwater. However, little is known about the distribution characteristics and formation mechanism of high-As groundwater in the lower reach of the Yellow River. There were 203 groundwater samples collected in different groundwater systems of the lower Yellow River for the exploration of its hydrogeochemical characteristics. Results showed that more than 20% of the samples have arsenic concentrations exceeding 10 μg/L. The high-As groundwater was mainly distributed in Late Pleistocene–Holocene aquifers, and the As concentrations in the paleochannels systems (C2 and C4) were significantly higher than that of the paleointerfluve system (C3) and modern Yellow River affected system (C5). The high-As groundwater is characterized by high Fe2+ and NH4+ and low Eh and NO3−, indicating that reductive dissolution of the As–bearing iron oxides is probably the main cause of As release. The arsenic concentrations strikingly showed an increasing tendency as the HCO3− proportion increases, suggesting that HCO3− competitive adsorption may facilitate As mobilization, too. In addition, a Gibbs diagram showed that the evaporation of groundwater could be another significant hydrogeochemical processes, except for the water–rock interaction in the study area. Different sources of aquifer medium and sedimentary structure may be the main reasons for the significant zonation of the As spatial distribution in the lower Yellow River.

scholarly journals Variation Tendency of Coastline under Natural and Anthropogenic Disturbance around the Abandoned Yellow River Delta in 1984–2019

2021 ◽  
Vol 13 (17) ◽  
pp. 3391
Author(s):  
Zhipeng Sun ◽  
Xiaojing Niu
Keyword(s):  
Water Level ◽  
Tidal Flat ◽  
Intertidal Zone ◽  
Anthropogenic Disturbance ◽  
Yellow River ◽  
Cumulative Effect ◽  
Yellow River Delta ◽  
River Delta ◽  
Flat Area ◽  
Flat Profile

The coast around the Abandoned Yellow River Delta underwent significant changes under anthropogenic disturbance. This study aims to reveal the variation of the coastline, tidal flat area, and intertidal zone slope before, during, and after extensive reclamation during the period of 1984–2019 using satellite remote sensing images. In order to eliminate the influence of the varying water level, a new coastline correction algorithm had been proposed under the condition of insufficient accurate slope and water level data. The influence of seawalls on slope estimation were considered in it. The spatiotemporal evolution of coast had been analyzed and confirmed to be reasonable by comparing with the observed data. The results show that the coast can be roughly divided into a north erosion part and a south deposition part. Affected by reclamation, their tidal flat area in 2019 is reduced to only 43 and 27% of original area in 1984, respectively, which results in a continuous decrease in the tidal flat width. The adjustment of the tidal flat profile makes the slopes steeper in the erosion part, while the slopes in the deposition part remain stable. The reclamation has stimulated a cumulative effect as the disappearance of the intertidal zone, which may lead to the destruction of biological habitats.

Causes and distribution of arsenic contamination in Bangladesh: evidence from the literature

Water Policy ◽  
2009 ◽  
Vol 11 (3) ◽  
pp. 362-378 ◽  
Author(s):  
N. Nahar
Keyword(s):  
Water Policy ◽  
Human Error ◽  
New Technology ◽  
Pyrite Oxidation ◽  
Arsenic Concentration ◽  
Leafy Vegetables ◽  
Arsenic Content ◽  
Precautionary Measure ◽  
Arsenic In Groundwater ◽  
Tube Wells

In attempting to eliminate disease caused by drinking polluted surface water, millions of tube-wells were drilled in Bangladesh. However, owing to arsenic in groundwater, the availability of safe drinking water has declined from earlier achievement of 97% to 51.2%. This article reviews the causes and distribution of arsenic concentration in rural Bangladesh from a wide variety of literature. Scientists have converged to two hypotheses for causes of arsenic in groundwater: the pyrite oxidation hypothesis and the oxy-hydroxide reduction hypothesis. There is a positive correlation between arsenic content in irrigated groundwater and arsenic contained in soils. There is a significant presence of arsenic in rice and leafy vegetables. Today, arsenic is causing toxicity to human health and creating major social problems. This finding implies that, had there been a precautionary measure taken when a new technology tube-well was being introduced, in the form of testing water for harmful metals, the risk that the rural population is facing now could have been drastically reduced. This lack of precautionary measure, before starting a mass installation of tube-wells for drinking and irrigation should be seen as a “human error” and avoided in future water policy and planning.

A new method for fitting the complicated water level process of the lower Yellow River

2009 ◽  
Vol 52 (10) ◽  
pp. 2997-3003
Author(s):  
YongSheng Yuan ◽  
JiChun Wu ◽  
YiJun Zuo ◽  
JieRen Chen
Keyword(s):  
Water Level ◽  
Yellow River ◽  
New Method ◽  
Lower Yellow River ◽  
The Lower Yellow River ◽  
Level Process

scholarly journals Utilisation of satellite data in identification of geomorphic landform and its role in arsenic release in groundwater

2014 ◽  
Vol II-8 ◽  
pp. 29-35 ◽  
Author(s):  
R. P. Singh ◽  
N. Singh ◽  
S. Shashtri ◽  
S. Mukherjee
Keyword(s):  
Organic Matter ◽  
Iron Hydroxide ◽  
Satellite Image ◽  
Flood Plain ◽  
Spectral Signature ◽  
Brahmaputra River ◽  
Arsenic In Groundwater ◽  
Groundwater Samples ◽  
Geomorphic Features ◽  
Geomorphic Units

The present study was conducted to explore the influence of geomorphic features of the area on the mobilization of arsenic in groundwater. In this study, remote sensing and GIS techniques were used to prepare the geomorphic and slope map of the area. Different geomorphic features were identified on the basis of spectral signature on the LISS III and Landsat satellite image and field survey. Groundwater samples were collected from each representative geomorphic feature to inspect the arsenic contamination in the area. The study area is drained by the Brahmaputra river and its tributaries and contain mainly fluvial geomorphic units especially older flood plain, palaeochannels, oxbow lakes, channel islands; and hilly areas at some of the places. In this study it was observed that enrichment of arsenic in groundwater varies along the geomorphic units in following trends Paleochannel> Younger alluvial plain> Active flood plain> channel island > dissected hills. The above trend shows that a higher concentration of arsenic is found in the groundwater samples collected from the fluvial landforms as compared to those collected from structural landforms. Brahmaputra River and its tributaries carry the sediment load from the Himalayan foothills, which get deposited in these features during the lateral shift of the river’s courses. Arsenic bearing minerals may get transported through river and deposit in the geomorphological features along with organic matter. The flat terrain of the area as seen from the slope map provides more residence time to water to infiltrate into the aquifer. The microbial degradation of organic matter generates the reducing environment and facilitates the dissolution of iron hydroxide thus releasing the adsorbed arsenic into the groundwater.

scholarly journals Spatiotemporal Characteristics and Driving Force of Ecosystem Health in an Important Ecological Function Region in China

2020 ◽  
Vol 17 (14) ◽  
pp. 5075 ◽  
Author(s):  
Wei Shen ◽  
Zhicheng Zheng ◽  
Yaochen Qin ◽  
Yang Li
Keyword(s):  
Influencing Factors ◽  
Land Surface ◽  
Ecosystem Health ◽  
Yellow River ◽  
Ecological Function ◽  
Evaluation Index System ◽  
Interactive Effects ◽  
Annual Average ◽  
Health Level ◽  
Spatial Differences

Quantitative assessment can scientifically determine the health status of a regional ecosystem, identify regional eco-environmental problems, and assist in promoting regional sustainable development and environmental management. Taking China’s important ecological function region, the Yellow River affected area as an example, this study constructed an extended evaluation index system based on the pressure-state-response framework, and remote sensing and GIS techniques were used to dynamically evaluate the spatial and temporal characteristics of ecosystem health in the study area. Furthermore, influencing factors on ecosystem health in the study area were extensively analyzed using the GeoDetector model. The results show that the ecosystem health level in the study area shows significant spatial heterogeneity from 1995–2015, and showed a fluctuating change process. Areas with large fluctuations in health level were mainly distributed in extreme climate areas, ecologically fragile areas, on plains and in hilly areas. Spatial differences of ecosystem health were well explained by using the biological abundance index, relief degree of land surface, soil type, annual average precipitation, elevation, annual average temperature, and population density. Influencing factors have significant interactive effects on ecosystem health.

Model Test Study on Embankment Instability Induced by Rapid Drawdown of Water Level at Yellow River Downstream

2010 ◽  
Vol 160-162 ◽  
pp. 750-755
Author(s):  
Yu Kun Zhao ◽  
Ji Hong Yang ◽  
Qing An Li
Keyword(s):  
Water Level ◽  
Model Test ◽  
Yellow River ◽  
Digital Camera ◽  
Hydrodynamic Pressure ◽  
Test Methods ◽  
Test Study ◽  
Short Period ◽  
Water Lever ◽  
Water Level Decline

Rapid drawdown of water level is one of the most important factors that influencing the embankment stability. Based on the principle of geomechanical model test and hydroaulic model test methods, the model test was performed to study Yellow River downstream embankment instability induced by rapid drawdown of water level. The slope models with geometric scale of 1:25, 1:45, 1:62.5 were constructed in the transparent plexiglass model box with 1.6m long, 0.8m wide and 0.6m high. Changes on the slope were recorded during water level decline at different velocity by digital camera and slope tracer etc. The model test results showed that during the rapid drawdown process, there was only small cracks and not slippage in advance; when the water level dropped to a certain height, the sliding distance increased suddenly, which showed that the rate of water level decline was behind the river water, and the slope weight and downslope hydrodynamic pressure by the saturation line in slope body were higher than water lever exceeds the sliding force in a very short period of time, which caused landslide; after the sliding body appearing, slide was continuous and not mutation.

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