Subjects: Geosciences >> Geography submitted time 2024-04-29 Cooperative journals: 《干旱区研究》
Abstract： Mining activities have strongly changed the characteristics of the regional hydrological cycle and have a significant impact on the chemical characteristics of groundwater. Revealing the evolutionary characteristics of the groundwater system under the influence of coal mine development can provide theoretical support for ecological environment protection and sustainable development in coal mine areas. In this paper, taking the Yimin Basin in Inner Mongolia as an example, based on hydrogeological investigation combined with the groundwater flow system theory, Piper three-line diagram, Gibbs diagram, ion proportional coefficient, mineral saturation index, and other analysis methods, the characteristics of groundwater chemical changes under the interference of coal mining activities were explored. Results indicate that the overall water environment in the study area is weakly alkaline, and the significant influence and noninfluence zones exceed the detection indexes in different degrees. Coal mining in the basin has accelerated the rate of regional hydrological cycle, causing the water quality in the significant impact zone to evolve toward desalination. The development of open-pit coal mining has opened up the previously closed groundwater system, and a series of water-rock interactions stimulated by the oxidation of sulfur- containing coal and sulfurous iron ore and acid production primarily cause the changes in the chemical characteristics of the regional groundwater. The hydrochemistry of groundwater in the basin is affected by evaporation, concentration and water- rock interactions. Along the flow direction of groundwater, the hydrochemical type in the significantly affected area changes from HCO3-Ca·Na type to HCO3-Ca, and the concentrations of TDS and Cl- show a downward trend. In the nonaffected zone, the hydrochemical type changed from HCO3-Ca·Na to Cl-Ca·Mg, and the concentrations of TDS and Cl- showed an upward trend.
Subjects: Geosciences >> Geography submitted time 2020-12-17 Cooperative journals: 《干旱区研究》
Abstract：内蒙古托克托县地下水普遍高氟、高盐，大部分不适合长期饮用，而位于县城西南的“神泉”，却因优良的水质成为该区域人民生活的主要水源。为了探寻“神泉”水的来源及其与周边地下水化学特征不同的原因，通过收集水文地质资料、实地踏勘及取样分析的基础上，利用Piper三线图法、Durov图法、地下水流动系统分析等方法对该泉水以及周边地下水进行对比分析并追溯其来源。结果表明：（1）“神泉”虽处于托克托县境内冲湖积平原排泄区并紧邻黄河，但其水质低氟高锶（HCO3-Ca型水）与黄河水（Cl-Na型水）及周边地下水（高氟、高TDS）有本质的不同。（2）“神泉”水与黄河水及周边地下水无明显的水力联系，其主要是由库布齐沙漠区地下水通过鄂尔多斯北缘断层，经由黄河河床淤泥下伏断裂通道补给形成，属于典型的断层泉。
Subjects: Geosciences >> Geochemistry submitted time 2019-11-14 Cooperative journals: 《干旱区研究》
Abstract： 以内蒙古托克托县地区为研究对象，通过系统采集浅层地下水和土壤样品，分析研究区浅层地下水和土壤中氟化物的赋存分布规律及其相关性。结果表明：托克托县地区浅层地下水氟的最低浓度为0.15 mg·L-1，最高浓度为7.00 mg·L-1，平均值为2.10 mg·L-1。研究区的绝大部分地区浅层地下水中氟含量大于1.00 mg·L-1，已不宜作为生活饮用水源。整体表现为东南部湖积台地地下水氟含量要高于西北部冲湖积平原地区。在低TH（总硬度）、偏碱性的浅层地下水环境中，Ca2+的活度会降低，有利于F-在地下水中的富集。浅层地下水中氟与土壤水溶性氟的空间浓度分布特征具有较高的相似性，湖积台地及蛮汉山前地带沉积的富氟矿物，是本区土壤和浅层地下水中氟化物的主要来源。
Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2019-09-09 Cooperative journals: 《干旱区研究》
Abstract：我国西北地区湖泊萎缩、干涸，大面积裸露湖床成为化学粉尘的释放源。湖床植被能有效抑制粉尘排放，提高干涸湖床植被覆盖度成为生态治理的重要举措之一。本研究以内蒙古北部边缘典型现代干涸盐湖——巴拉嘎斯湖为研究区，通过野外调查，样带选择，实地采样分析和实验室统计分析，研究了干涸湖床地下水及土壤化学属性对湖区自然植被分布的控制作用。结果表明：在地下水和土壤化学属性影响下，湖区植被从干涸湖床至湖滨依次呈现芦苇群落、盐爪爪群落、芨芨草群落、红砂群落和小针茅群落的环状分布。湖区自然植被分布主要受地下水水位、地下水总溶解性固体(TDS)与土壤有效磷含量的控制。地下水埋深由湖床至湖滨逐渐增加，地下水TDS逐渐减小，当地下水埋深为4 m左右且TDS较低(<10 g·L-1)时，植被群落呈现最大生物量及最大覆盖度。土壤有效磷对植被分布影响最大，其次是土壤中SO42-。当土壤含盐量能满足原生自然植被正常生存的条件时，地下水与土壤有效磷含量应是人工恢复植被优先考虑的因素。
Hits
Hits
Downloads
Comment