Identifying the source and transformation of riverine nitrates in a karst watershed, North China: Comprehensive use of major ions, multiple isotopes and a Bayesian model

2022 ◽  
pp. 103957
Author(s):  
Jie Zhang ◽  
Mingda Cao ◽  
Menggui Jin ◽  
Xin Huang ◽  
Zhixin Zhang ◽  
...  
Keyword(s):  
Bayesian Model ◽  
North China ◽  
Major Ions ◽  
Multiple Isotopes

scholarly journals Comprehensive Understanding of Groundwater Geochemistry and Suitability for Sustainable Drinking Purposes in Confined Aquifers of the Wuyi Region, Central North China Plain

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3052
Author(s):  
Qichen Hao ◽  
Yong Xiao ◽  
Kang Chen ◽  
Yuchen Zhu ◽  
Jianfeng Li
Keyword(s):  
Brackish Water ◽  
North China Plain ◽  
North China ◽  
Major Ions ◽  
Central Area ◽  
Mineral Dissolution ◽  
Parameter Determination ◽  
Groundwater Geochemistry ◽  
Drinking Purposes ◽  
Confined Aquifers

Confined groundwater is important for the domestic water supply in arid and semiarid regions that have salty phreatic water. A systematic investigation was conducted in the Wuyi region, a typical central area of the North China Plain (NCP), regarding the confined groundwater geochemistry. A total of 59 samples were collected from confined aquifers across the region for in situ parameter determination and laboratory analysis. The results showed the confined groundwater was neutral to slightly alkaline, and dominantly soft fresh. The moderately hard brackish water and very hard brackish water accounted for 1.69% and 6.78% of the total samples, respectively. The hydro-chemical faces are mainly SO4·Cl–Na type with a few of the HCO3–Na type. The entropy-weighted water quality index assessment demonstrated that 21.3% of the groundwater samples came under the medium to extremely poor quality, and were unsuitable for drinking purposes due to the high content of major ions. Various populations are at a chronic health risk at some local sites by high levels of F- and Fe in groundwater, with susceptibility in the order of adult females < adult males < children < infants. The poor groundwater quality and health threats result from the natural water–rock interactions (including mineral dissolution and cation exchange) rather than anthropogenic inputs. This research can provide references for groundwater resource development and management in the NCP and other similar regions worldwide.

Multi-model ensemble prediction of terrestrial evapotranspiration across north China using Bayesian model averaging

2016 ◽  
Vol 30 (16) ◽  
pp. 2861-2879 ◽  
Author(s):  
Gaofeng Zhu ◽  
Xin Li ◽  
Kun Zhang ◽  
Zhenyu Ding ◽  
Tuo Han ◽  
...  
Keyword(s):  
Bayesian Model ◽  
North China ◽  
Bayesian Model Averaging ◽  
Model Averaging ◽  
Ensemble Prediction ◽  
Model Ensemble

Using major ions and δ15N-NO3− to identify nitrate sources and fate in an alluvial aquifer of the Baiyangdian lake watershed, North China Plain

2013 ◽  
Vol 15 (7) ◽  
pp. 1430 ◽  
Author(s):  
Shiqin Wang ◽  
Changyuan Tang ◽  
Xianfang Song ◽  
Ruiqiang Yuan ◽  
Qinxue Wang ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Major Ions ◽  
Alluvial Aquifer ◽  
Nitrate Sources ◽  
Baiyangdian Lake

scholarly journals Differences in hydrogeochemistry between shallow and deep aquifers in the Baiyangdian basin, China

2019 ◽  
Vol 98 ◽  
pp. 07009
Author(s):  
Huaming Guo ◽  
Zhaoli Shen ◽  
Yi Chen ◽  
Kai Zhao ◽  
Haitao Li ◽  
...  
Keyword(s):  
Pore Water ◽  
North China Plain ◽  
North China ◽  
Major Ions ◽  
Shallow Groundwater ◽  
Water Isotopes ◽  
Silicate Weathering ◽  
Deep Groundwater ◽  
Deep Aquifers

Groundwater is the dominant long-term water resource for agricultural irrigation and industrial production in the Baiyangdian basin, North China Plain. Groundwater and pore-water were investigated to evaluate chemical evolution and geochemical processes in shallow and deep aquifers. Results show that both shallow groundwater and shallow pore-water had higher TDS, Ca2+, Mg2+, SO42-, and HCO3- concentrations than deep groundwater and deep pore-water. Generally, concentrations of groundwater major ions were higher than those of pore-water in shallow aquifers, while they were slightly lower in groundwater than in pore-water from deep aquifers. Water isotopes showed the meteoric origin of groundwater and pore-water, although evaporation signature was traced in shallow groundwater. Shallow groundwater also experienced carbonate dissolution and silicate weathering. Silicate weathering and evaporite dissolution were the major hydrogeochemical processes in deep aquifers. This study indicated that deep groundwater has better water quality, but is vulnerable to contamination from shallow groundwater with high TDS and NO3- concentrations.

Identifying source and transformation of riverine nitrates in a karst watershed, North China: comprehensively using major ions, multiple isotopes and Bayesian model

2021 ◽  
Author(s):  
Jie Zhang ◽  
Menggui Jin
Keyword(s):  
Surface Water ◽  
Organic Nitrogen ◽  
North China ◽  
Drainage Basin ◽  
Major Ions ◽  
Inorganic Nitrogen ◽  
Mixing Model ◽  
Main Process ◽  
Soil Organic Nitrogen ◽  
Biogeochemical Transformations

&lt;p&gt;The identification of nitrate (NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt;) sources and biogeochemical transformations is critical for understanding and controlling diffuse pollution in surface water in drainage basins. This study&amp;#160;combines&amp;#160;water chemistry, environmental isotopes (&amp;#948;&lt;sup&gt;2&lt;/sup&gt;H&lt;sub&gt;H2O&lt;/sub&gt;, &amp;#948;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;H2O&lt;/sub&gt;, &amp;#948;&lt;sup&gt;15&lt;/sup&gt;N&lt;sub&gt;NO3&lt;/sub&gt;, and &amp;#948;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;NO3&lt;/sub&gt;), with land use data and a Bayesian isotope mixing model (Simmr), for reducing the uncertainty in estimating the contributions of different pollution sources in a Karst drainage basin of Jinan, North China. 64 samples were collected from&amp;#160;Yufu River (YFR) of Jinan city in September and December, 2019. The results revealed that the NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;-N (4.41mg/L) was the predominant form of inorganic nitrogen in YFR watershed, accounting for about 58% of total nitrogen (8.06 mg/L). There were significant temporal and spatial variations in nitrate concentrations in the area. The nitrate concentration in time was low in December and high in September, while the process of first rising and then attenuating from upstream to downstream in space. Moreover, according to the surface water flow path, different biogeochemical transformations were observed throughout the study area: microbial nitrification was dominant in the upstream with elevated NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;-N concentrations; in the middle stream a mixing of different transformations, such as nitrification, denitrification, and/or assimilation, were identified, associated to moderate NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;-N concentrations; whereas in the downstream the main process affecting NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;-N concentrations was assimilation, and/or denitrification, resulting in low NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;-N concentrations. Water chemical and dual isotope of &amp;#948;&lt;sup&gt;15&lt;/sup&gt;N&lt;sub&gt;NO3&lt;/sub&gt;&amp;#160;and &amp;#948;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;NO3&amp;#160;&lt;/sub&gt;indicated that the river water was significantly affected by soil organic nitrogen and ammonium fertilizer inputs. Simmr mixing model outputs revealed that soil organic nitrogen (SON 55.5%) and ammonium fertilizer inputs(AF 29.5%) were the primary contributors of N pollution, whereas nitrate fertilizer(NF 7.1%), sewage &amp; manure (M&amp;S 3.6%), and atmospheric deposition (AP3.4%) played a less important role. The chemical fertilizer (AF and NF) and SON collectively mean contributing &gt; 50 % of nitrate both in September and December in the watershed. Therefore, reducing fertilizer application and adopting water-saving irrigationare key to control nitrate pollution in the area. The results provide scientific basis for the water quality protection and sustainable water management in the study area or similar areas.&lt;/p&gt;

Using major ions and stable isotopes to characterize recharge regime of a fault-influenced aquifer in Beiyishui River Watershed, North China Plain

2011 ◽  
Vol 405 (3-4) ◽  
pp. 512-521 ◽  
Author(s):  
Ruiqiang Yuan ◽  
Xianfang Song ◽  
Yinghua Zhang ◽  
Dongmei Han ◽  
Shiqin Wang ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
North China Plain ◽  
North China ◽  
Major Ions ◽  
River Watershed
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