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981.
Thermal regime of a supraglacial lake on the debris-covered Koxkar Glacier, southwest Tianshan, China 总被引:1,自引:0,他引:1
A supraglacial lake was surveyed on the Koxkar Glacier in southwest Tianshan from July to September 2007 and July to September 2008, and the temperature variation characteristics of the lake, debris and debris-free ice were analyzed at different depths to determine the thermal regimes. In addition, the discrepancies of temperature variation characteristics were investigated for different geomorphic units of the ablation zone of the Koxkar Glacier. It was found that daily temperature variation curves for deep water are V-shaped because meltwater from the glacier surface at temperatures of around 0°C feeds the lake and mixes with the relatively high-temperature surface water during the day. As the water temperature rises to approximately 4°C, the mixed water sinks and forms a low-temperature trough in the deep water of the lake in the middle of the day. The vertical lapse rate of the lake water temperature against depth (?0.33°C/m) has a magnitude lower than that of the debris (?4.29°C/m) and that of the debris-free ice (?0.38°C/m) in the Koxkar Glacier??s ablation zone. The temperature curve for the surface water largely varied between the temperature curves for the debris at depths of 0.2 and 0.5?m. The surface thermal condition of the ablation zone is significantly affected by the daily weather, and there is a limited influence in debris at a depth of 1?m and in the lake at a depth of 5?m. 相似文献
982.
Major ion geochemistry of shallow groundwater in the Qinghai Lake catchment, NE Qinghai-Tibet Plateau 总被引:6,自引:2,他引:4
Conventional hydrochemical techniques and statistical analyses were applied to better understand the solute geochemistry and the hydrochemical process of shallow groundwater in the Qinghai Lake catchment. Shallow groundwater in the Qinghai Lake catchment is slightly alkaline, and is characterized by a high ion concentrations and low water temperature. The total dissolved solids (TDS) in most of the samples are <1,000?mg/L, i.e. fresh water and depend mainly on the concentration of SO4 2?, Cl? and Na+. Groundwater table is influenced directly by the residents?? groundwater consumption. Most of the groundwaters in the Qinghai Lake catchment belong to the Ca2+(Na+) ?CHCO3 ? type, while the Qinghai Lake, part of the Buha (BHR) and the Lake Side (LS) samples belong to the Na+?CCl? type. The groundwater is oversaturated with respect to aragonite, calcite and dolomite, but not to magnesite and gypsum. Solutes are mainly derived from strong evaporite dissolution in Daotang, BHR and LS samples and from strong carbonate weathering in Hargai and Shaliu samples. Carbonate weathering is stronger than evaporite dissolution with weak silicate weathering in the Qinghai Lake catchment. Carbonate weathering, ion exchange reaction and precipitation are the major hydrogeochemical processes responsible for the solutes in the groundwater in the Qinghai Lake catchment. Most of the shallow groundwaters are suitable for drinking. More attention should be paid to the potential pollution of nitrate, chloride and sulfide in shallow groundwater in the future. 相似文献
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阐述了引入时间距离权的传统GM(1,1)模型的建模过程以及灰色模型等级的判断方法,深入分析了白化背景参数λ取值对建模精度的影响;同时针对传统λ取值的缺陷,提出使用基于实数编码的改进遗传算法(IRCGA)对其进行优化处理,并用多个工程实例分析验证了优化后的GM(1,1)模型相对传统的灰色模型及其优化模型拟合效果更好,更加贴近真实数据序列。 相似文献
985.
Data obtained from over 250 CTD stations in December 2006 and April 2007 were used to analyze the temperature and salinity structure of the water masses of the ... 相似文献
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对某型陀螺经纬仪的仪器常数受环境温度的影响进行实验,利用数理统计方法分析、处理了各温度下仪器常数的数据,发现其变化符合线性规律,从而可实现温度对仪器常数的漂移影响的自动补偿。 相似文献
990.