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Yanchi Evolution of groundwater chemical composition

Author: ZuoZuo
Tutor: QianHui
School: Chang'an University
Course: Environmental Engineering
Keywords: Hydrogeochemical Groundwater Circulation Chemical evolution of water Isotope Hydrogeochemical modeling Salt Lake Area
CLC: P641.3
Type: Master's thesis
Year: 2007
Downloads: 144
Quote: 2
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Abstract


Yanchi County, north China's relatively poor areas of water resources, groundwater resources are the region's main source of water supply. But the region of high TDS groundwater, water quality overall is poor, and the high content of fluoride ions, leading to the occurrence of endemic diseases. For the region, water shortages, poor water quality and the widespread occurrence of endemic situation, this paper analyzes the data collected on the basis of the chemical evolution of groundwater in Yanchi its formation mechanism. Research results for the rational development and utilization of groundwater resources and groundwater pollution prevention and the prevention and treatment of endemic diseases provides a scientific basis. This is to ensure the sustainable development of the local economy, alleviate water shortages conflicts, protecting groundwater resources in Yanchi has important significance. The main contents and conclusions are as follows: (1) groundwater study area can be divided into loose rock pore water and debris fractured porous rock fracture pore water two types. Cenozoic rock group includes major aquifer aquifer rock group rock group Luohandong aquifer, river water-bearing formation and ring Luohe water-bearing formation, the water-bearing formation of groundwater recharge, runoff and discharge conditions by geological, geomorphological conditions control. (2) in the study area topography, hydrogeology and water cycle characteristics were analyzed on the basis of the regional groundwater system is divided into three, namely: gaoshawo a large puddle of groundwater systems, Yanchi - mafang groundwater systems and Mahuangshan groundwater system. (3) Cenozoic Yanchi, Luohandong and Central River water-bearing formation groundwater chemical types from top to bottom, respectively SO 4 · HCO 3 -type, SO 4 · Cl-and SO 4 · Cl type based. Cenozoic aquifer rock group and rock group Luohandong aqueous chemical composition of groundwater watershed north and south by the salt ponds greater impact to the watershed is bounded to the east and west sides of groundwater distribution changed regularly; Central River water-bearing formation of the overall distribution of groundwater chemistry from south to north on the changed regularly. (4) in the study area groundwater δ 18 O, δD isotopes showed that: Yanchi three water-bearing formation by meteoric groundwater recharge; layers bit groundwater 14 C and the results confirmed the determination of tritium, Central River water-bearing formation slow groundwater runoff, water alternately to a lesser extent. (5) the use of chemical analysis for water PHREEQC data were hydrogeochemical modeling. Component is present in the form of groundwater and mineral saturation indices were calculated; simultaneously along the direction of groundwater flow on the water-bearing formation were reverse geochemical modeling. Simulation results show that: in each group aquiferous direction of groundwater flow, the dissolution of gypsum alternating adsorption process and cation Na desorption dominant, and calcite, dolomite and other minerals in a different salt path on groundwater chemical composition all have different effects. (6) Salt Lake groundwater chemical composition of the main factors, including geological and hydrogeological conditions, the role of evaporation, soil, and water soluble salt content - rock interactions. Causes of fluoride ions in groundwater studies suggest that climatic conditions, special hydrogeological conditions and hydrogeochemical characteristics of the main reason for the formation of fluoride water and proved for the F major mineral fluorite sources. Finally, in the paper looking for high-quality water fluoride water district suggested.

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CLC: > Astronomy,Earth Sciences > Geology > Hydrogeology and Engineering Geology > Hydrogeology (groundwater hydrology ) > Hydrogeochemical
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