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Measurement of solidprecipitation and blowing snow: current status and challenges

Advances in Polar Science 2024年第3期35卷 289-302页

作者： PAN Rui LIU Xichuan SHI Jiayi College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Key Laboratory of High Impact Weather(special) China Meteorological AdministrationChangsha 410073China

In this article,the relevant instruments and techniques for measuring solid precipitation and blowing snow are reviewed,with a focus on the in situ instrument ***,a literature review and specific observation activities for solid precipitation are provided,the working principles of several instruments are introduced,and the advantages and disadvantages,measurement performance,and specific application scenarios of the instruments are ***,there are numerous solid precipitation measurement instruments available,and the standardization and sustainability of these measurements also need to be *** purpose of the review is not to be exhaustive but to provide readers with information on the current status of the development of relevant technologies and the prospects for their application in the polar regions.

关键词： solid precipitation blowing snow measurement instruments

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Impact of capillary pressure on permeability impairment during CO2 injection into deep saline aquifers

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Journal of Central South University 2013年第8期20卷 2293-2298页

作者： WANG Yuan LIU Yang Key Laboratory for Geomechanics and Embankment Engineering of Ministry of Education (Hohai University) Nanjing 210098 China College of Civil and Transportation Engineering Hohai University Nanjing 210098 China

During CO2 injection in deep saline aquifers, salt precipitation happens around the injection well because of capillary driven back flow, inducing permeability impairment. The permeability impairment affects CO2 injectivity and migration. Different values of three characteristic parameters for capillary pressure function (air entry pressure, empirical parameter m and liquid residual saturation) as well as input absolute value of maximum capillary are chosen in numerical simulation to figure out their effects on salt precipitation. Verma & Pruess model is then used for quantifying permeability impairment. Results show that permeability decreases with higher air entry pressure, larger liquid residual saturation, and especially smaller value of empirical parameter m. To enhance CO2 injectivity and avoid blocking of CO2 migration, a homogenous formation with large pore size should be chosen before CO2 injection into deep saline aquifer.

关键词： permeability impairment solid precipitation capillary pressure back flow characteristic parameters

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