Dynamic evolution of karst water levels and its controlling and influencing factors in Northern China: a case study in the Dawu water source area

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Zongjun Gao ◽  
Hongying Zhang ◽  
Jianguo Feng ◽  
Tongmin Lu ◽  
Lizhi Yang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Source Area ◽  
Water Source ◽  
Northern China ◽  
Water Levels ◽  
Dynamic Evolution ◽  
Karst Water

scholarly journals Hydrogeochemistry Evidence for Impacts of Chemical Acidic Wastewater on Karst Aquifer in Dawu Water Source Area, Northern China

2021 ◽  
Vol 18 (16) ◽  
pp. 8478
Author(s):  
Henghua Zhu ◽  
Jianwei Zhou ◽  
Zhizheng Liu ◽  
Lizhi Yang ◽  
Yunde Liu
Keyword(s):  
Karst Aquifer ◽  
Source Area ◽  
Water Source ◽  
Northern China ◽  
Total Hardness ◽  
Karst Groundwater ◽  
Hydrochemical Characteristics ◽  
Rock Interaction ◽  
The Impact ◽  
Acidic Wastewater

The study of the hydrochemical characteristics and the water–rock interaction of karst groundwater is very important for the rational exploitation of karst groundwater and its pollution control. In this paper, the systematic clustering method was used to analyze the hydrochemical characteristics of different types of groundwater, combined with hydrochemical graphic analysis and correlation analysis to explore the impact of chemical acidic wastewater on the evolution of karst aquifer in the Dawu water source area, northern China. The results show that the chemical acid wastewater, sourcing from discharges/spillages from the local chemical industries, has different degrees of pollution impact on karst groundwater, causing the total hardness of all karst groundwater and the total dissolved solids, Cl− and SO42− in nearly half of the karst groundwater to exceed the quality indexes of class III water in China’s standard for groundwater quality (GB/T 14848-2017). Hydrochloric acid and sulfuric acid in the wastewater can be buffered by the dissolution of carbonate rocks, resulting in a nearly neutral pH (pH-buffering effect) and an increase in Ca2+, Mg2+, Sr, Cl− and SO42− concentrations in karst groundwater.

A Holocene Vegetation Record from the Mississippi River Valley, Southeastern Missouri

1977 ◽  
Vol 8 (3) ◽  
pp. 307-323 ◽  
Author(s):  
James E. King ◽  
William H. Allen
Keyword(s):  
Ground Water ◽  
Mississippi River ◽  
Source Area ◽  
Water Source ◽  
River Valley ◽  
Water Levels ◽  
Old Field ◽  
Mississippi River Valley ◽  
Maximum Expansion ◽  
Prairie Peninsula

Pollen preserved in a peat deposit from a large swamp, the Old Field in the Mississippi River Valley near Advance, Missouri, records radiocarbon-dated vegetation changes between 9000 and about 3000 years ago. The principal feature of both the percentage and influx pollen diagrams is the replacement of arboreal pollen, primarily Quercus, Fraxinus, and Cephalanthus, with Gramineae and NAP between 8700 and 5000 years BP. This vegetation shift is interpreted as reflecting a decrease in the extent of the Old Field swamp and its associated bottomland forest species along with the expansion of a grass-dominated herb community, as a result of a reduction in available ground water. The desiccation of the swamp during this period indicates a reduction in precipitation within the ground-water source area and a shift to a drier climate in the southern Midwest. The pollen suggests that the lowest water levels and driest climate in southeastern Missouri lasted from 8700 to 6500 years BP, at which time there is a partial reappearance of swamp species. Relatively dry conditions, however, continued until at least 5000 years BP. Although pollen influx data are lacking from the upper part of the profile, the relative pollen frequencies suggest an increase in trees after 5000 BP. The replacement of the arboreal vegetation by grasses and herbs between 8700 and 5000 years BP reflects the period of maximum expansion of the Prairie Peninsula in southeastern Missouri. The Old Field swamp provides the first pollen evidence that the vegetational changes along the southern border of the Prairie Peninsula were chronologically similar to those on the northern and northeastern margins.

Analysis on regional vegetation changes in dust and sandstorms source area: a case study of Naiman Banner in the Horqin sandy region of Northern China

2014 ◽  
Vol 73 (5) ◽  
pp. 2013-2025 ◽  
Author(s):  
Yun Zhou ◽  
Xueli Chang ◽  
Shengxing Ye ◽  
Zhirong Zheng ◽  
Shihai Lv
Keyword(s):  
Source Area ◽  
Northern China ◽  
Vegetation Changes

scholarly journals Responses of abrupt temperature changes/warming hiatuses to changes in their influencing factors: A case study of northern China

2020 ◽  
Vol 27 (4) ◽  
Author(s):  
Longteng Liang ◽  
Long Ma ◽  
Qi Feng ◽  
Tingxi Liu ◽  
Bolin Sun ◽  
...  
Keyword(s):  
Influencing Factors ◽  
Northern China ◽  
Temperature Changes
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