珠江广州河段微表层与次表层水环境质量比较(英文)

The water quality in the surface microlayer(SML) and subsurface water(SSW) in the Guangzhou segment of Pearl River, a eutrophic urban river section in China, were analyzed. The spatial and temporal dynamics of nutrient concentrations, heavy metals and bacteria were examined from two sampling sites in monthly samples throughout 2010. The mean concentrations of total nitrogen, ammonia, nitrate and nitrite were higher than 7.0 mg/L, 3.1 mg/L, 1.1 mg/L and 0.3 mg/L, while total phosphorus and orthophosphate were 0.5 mg/L and 0.1 mg/L, respectively. These results indicated that the water quality was rich in minerals and eutrophic. The mean concentrations of Mn and Fe were higher than 0.013 mg/L; and Ni, Cr and Pb were higher than 0.001 mg/L. The mean concentrations were in the order of Mn Fe Ni Pb Cr. The concentrations of heavy metals in the Guangzhou segment were lower than the limit of the surface water quality standards in China and the World Health Organization(WHO), but higher than the median values in the world's freshwater. The density of bacteria ranged from 3.30×105 to 5.23×106 cells/mL, and the amount of cultivable heterotrophic bacteria ranged from 1.30×10 3 to 1.89×10 6 cfu/mL. Fecal coliform levels were beyond the V class of China water quality standard. The SML was enriched in nutrients, heavy metals and bacteria, with the maximum enrichment factor of 3.84 for nutrients, 8.00 for heavy metals, and 3.04 for bacteria, suggesting that the water quality of the SML of the Guangzhou segment of the Pearl River was more serious than in the SSW.     

水平定向钻进技术在胡底煤矿地质构造勘探中的应用

定向钻孔技术可以精确控制钻孔轨迹,可满足胡底煤矿对探明地质构造的要求。该矿采用ZDY6000LD型钻机施工4个近水平定向钻孔,精确探明主运、辅运石门的煤层走向,为抽掘采衔接提供了依据。介绍了胡底煤矿地质构造勘探定向孔的设计依据及钻进工艺。     

黑龙江省高速公路气象灾害风险普查分析

<正>1引言黑龙江省公路交通近年来发展迅猛,由于黑龙江省地形复杂、气候多样、灾害性天气种类繁多,恶劣天气通常会导致高速公路路段出现诸如能见度低、路面积冰(积水)打滑等恶劣路况,易引发重大安全事故。3-4月和10-11月为黑龙江省交通事故的多发期,冰雪、大雾等气象灾害对公路交通的影响尤为突出。     

金沙江大具盆地碎屑堆积体的土壤碳酸盐铀系测年

金沙江大具盆地中堆积着巨厚的碎屑沉积物, 覆盖于6级阶地之上, 拔河高度可达300 m以上, 其成因和年代都是我国地貌学的研究热点。由于大具盆地的碎屑堆积体岩性简单、分选性差, 缺乏合适的测年材料(如炭屑、火山灰、动物化石等), 此前仅有宇生核素¹⁰Be和²⁶Al暴露测年和光释光测年获得绝对测年数据。野外调查发现大具盆地碎屑堆积体中广泛发育着土壤碳酸盐, 而且其质地纯净致密, 适合于铀系测年, 可约束堆积体形成的最小年龄。为此, 采集了海拔高度分别在1859 m、1809 m、1738 m和1721 m的4处堆积体(DJ1、DJ2、DJ3和DJ4)中的34个土壤碳酸盐样品进行铀系测年。多接收器电感耦合等离子体质谱(MC-ICP- MS)的铀系测年结果显示这4处堆积体中土壤碳酸盐的最大年代分别为14.72±1.08 ka、11.30±0.17 ka、15.08±0.70 ka和16.34±1.22 ka都对应于末次冰消期。因此, 推测大具盆地中巨厚的碎屑沉积事件可能发生于末次冰消期或稍早时段, 最小年龄为16.34±1.22 ka。

     

气候变暖情景下黑龙江省未来100a采暖降温气候条件分析

利用美英等国5个海气耦合气候模式对黑龙江省(主要包括哈尔滨、齐齐哈尔、牡丹江和佳木斯4个地区)年、季平均气温前后近100 a进行模拟和预测结果,预估黑龙江省哈尔滨、齐齐哈尔、牡丹江和佳木斯4个城市气候变暖情景下未来100 a的采暖降温气候条件。可以为黑龙江省适应未来气候变化提供依据,为政府决策和能源公司做长远规划提供参考。