CAJ | 학술논문

深冰层取心钻探是极地科学考察的重要组成部分。在极地勘探取样过程中做到在获得高质量冰岩心样品的同时，将钻井液对极地环境的污染降低到最低程度，对保护极地原生环境具有重要意义。依据南极科学钻探的地层条件，应用Visual Modflow建立了污染物在雪层中的运移模型，在污染物浓度保持恒定时，对钻孔内污染物进行了数值模拟，预测了10年后污染物在雪中污染羽扩散范围。在此基础上，对比分析了不同弥散系数时，雪对污染物弥散的能力。极地科学钻探使用的钻井液粘度通常是水的10倍，随着污染物粘度的增大，其扩散的距离也将相应减少。研究结果为深入开展极地冰层取心钻探钻井液对极地环境影响评价研究奠定了重要的理论与技术基础。
심빙층취심찬탐시겁지과학고찰적중요조성부분。재겁지감탐취양과정중주도재획득고질량빙암심양품적동시，장찬정액대겁지배경적오염강저도최저정도，대보호겁지원생배경구유중요의의。의거남겁과학찬탐적지층조건，응용Visual Modflow건립료오염물재설층중적운이모형，재오염물농도보지항정시，대찬공내오염물진행료수치모의，예측료10년후오염물재설중오염우확산범위。재차기출상，대비분석료불동미산계수시，설대오염물미산적능력。겁지과학찬탐사용적찬정액점도통상시수적10배，수착오염물점도적증대，기확산적거리야장상응감소。연구결과위심입개전겁지빙층취심찬탐찬정액대겁지배경영향평개연구전정료중요적이론여기술기출。
Deep ice core drilling is an important constituent part of the polar scientific research.In polar exploration sam-pling process, at the same time of achieving high quality samples, the drilling fluid pollution to the polar region should be reduced to the lowest degree, which has great significance to the polar native environment protection.According to the stra-tum conditions of the polar scientific drilling, a transport model of pollutant in the snow layer is established by Visual Modf-low.When the pollutants concentration maintains constant, numerical simulation for the borehole pollutants is made to pre-dict the pollutants in snow plume diffusion range in a decade.On this basis, contrastive analysis is made on the pollutant dispersion ability of snow under different dispersion coefficient.The drilling fluid used in the polar is 10 times that of wa-ter, with the increase of pollutants viscosity, the diffusion range will also be reduced correspondingly.This study result lays the important theoretical and technical basis for the evaluation of the influence of drilling fluid used in polar ice core drilling on the polar environment.