红层地下水开发的经济技术条件     

朱春林  饶春富  邢志会  胡国华 《云南地理环境研究》2010,22(1):1-5

按照一般水文地质调查评价的标准,通常认为红层弱含水岩组中的地下水不具有开采利用价值。根据农村生活需水量小和红层含水层富水性普遍弱但分布广泛的特点,依据勘查示范项目的数据并结合前人已有的成果,重点探讨了红层地下水富水等级的划分和开发利用的经济技术条件,更新了红层地下水资源的价值观,使红层地下水开发具有普遍适用性、技术可行性及经济合理性,对解决红层地区的干旱缺水困难具有重要而普遍的意义。  相似文献   

有机质生烃动力学参数研究进展:回顾和展望   总被引：1，自引：0，他引：1  

饶松  胡圣标  汪集旸 《地球物理学进展》2010,25(4)

生烃动力学,作为一种动态的研究方法,在研究有机质生烃机制和解决油气勘探实际问题中具有独特的优势,因此得到了极大的发展.由于在不同地质背景下形成的不同或相同类型的有机质,其生烃动力学参数存在明显差异,这动摇了以典型干酪根类型为基础发展起来的传统生烃模式,给实际应用带给困难.所以,必须针对具体盆地特定烃源岩进行生烃动力学实验,求取特定烃源岩的生烃动力学参数,这样才能准确地模拟出盆地的生烃过程.为了逼近地质实际,更加精确地描述有机质生烃动力学参数,应加强对有机质分子结构的研究,探讨温、压共同作用下有机质生烃动力学模型.此外,中国南方海相碳酸盐岩生烃动力学的研究将是今后生烃动力学的重要发展趋势之一.  相似文献   

Determining the key conditions for the formation of metamorphic core complexes by geodynamic modeling and insights into the destruction of North China Craton     

Gang Lu  Liang Zhao  TianYu Zheng  Kun Wang  JianFeng Yang 《中国科学:地球科学(英文版)》2016,59(9):1873-1884

Metamorphic core complex(MCC) is characterized by the exhumation of lower crust over a large-scale detachment fault, providing natural records for tectonic extension. MCCs are widely identified in the North China Craton(NCC), which have been intensively studied on their structural and geological characteristics. Yet, the condition for the formation of MCCs and their link with NCC destruction are still in debate. In this study, we perform numerical simulations to investigate MCC formation under extension, with a focus on the effect of crustal rheologies. Results indicate that three end-member modes of deformation may occur: the metamorphic core complex mode, the detachment fault-uplifting mode and the pure shear mode. Weaker lower crust and stronger upper crust may promote the formation of MCC. In contrast, stronger lower crust(1.3×1021 Pa s) may prohibit the exhumation of lower crust(detachment fault-uplifting mode), while weaker upper crust(7.8×1021 Pa s) may fail to develop detachment faults(pure shear mode). Given that cratons typically have a strong crust, we suggest that the lower crust of NCC was weakened prior to extension, which promoted the formation of MCC in a later stage under the back-arc extension.  相似文献   

非轴对称位移边界下球孔扩张挤土位移弹性解答     

饶平平  崔纪飞  赵琳学  廖志坚 《岩土力学》2016,37(4):991-997

以现有半无限土体中球孔扩张挤土位移的解答为基础,分别对水平地表和非轴对称斜边两个位移边界进行应力修正,运用坐标转换法和叠加法的原理,改进现有的分析方法,得到较为简化的非轴对称位移边界下扩孔问题的解答,并对非轴对称斜边倾角以及球孔离斜边距离等因素对挤土位移的影响进行了分析。结果表明：倾斜边界条件的存在对球孔两侧的挤土位移有明显影响,且随着非轴对称边界倾角的增大,靠近倾斜边界侧的挤土位移也随之增大;球孔距自由边界的距离越大,自由边界对挤土位移的影响也越小。该解答对非轴对称边界条件下的静压沉桩以及相关扩孔问题的设计和施工具有一定的指导意义和实用价值。  相似文献   

球粒状铁绿纤石（?）的形貌结构特征与成因     

张良钜  饶灿  张昌龙  阮青锋  雷威  廖宝丽  何涛 《岩石矿物学杂志》2009,28(1):45-50

球粒状铁绿纤石(?)产出于云南昭通玄武岩晶洞中,与其共生的矿物有绿帘石、硅铁灰石、水晶、葡萄石及方解石等矿物.扫描电镜(SEM)下,该矿物呈扁平长柱状,沿柱体方向呈不同程度的弯曲,并绕球粒中的包裹体聚合生长成不同形状的球粒,聚合生长的方式取决于包裹体在球体中的位置与距离,越近球粒表面,越趋于平行排列.水晶的流体包裹体测温及拉曼光谱分析表明,铁绿纤石(?)属低温(148～169℃)热液产物,热液的盐度为 11%～12%,富含H2O及微量CH4,铁绿纤石(?)的形成可能与有机质(CH4)有关.  相似文献   

静电场轨道阱质谱在水中溶解性有机质表征中的应用进展     

王书越  何洪源  饶竹  石喆元  孟建卫  王立平  李开开 《地球学报》2022,43(1):101-109

溶解性有机质(Dissolved Organic Matter,DOM)在水生生态环境中广泛存在,影响着水环境中多种物质的生物地球化学性质.分析其组成与含量具有重要的生态环境意义,是生态环境科学领域研究的热点.溶解性有机质组成非常复杂,其分子组成的解析一直是难题.近年来,具有高分辨率、高灵敏度、高通量、高扫描速率等特性...  相似文献   

SPECTRAL METHODS OF FORECASTING STORM SURGES     

DESIRAJU B. RAO 《水文科学杂志》2013,58(3):311-316

ABSTRACT

A method of predicting the storm surges in a water body using the normal modes of the basin is described. Such a procedure eliminates the explicit use of a finite difference mesh in space and reduces the prediction equations to a system of ordinary time-dependent equations which can be solved in several ways. Application of the spectral (or normal mode) expansion technique to an ideal case is presented.  相似文献   

Observational Subseasonal Variability of the PM_2.5 Concentration in the Beijing-Tianjin-Hebei Area during the January 2021 Sudden Stratospheric Warming     

Qian LU  Jian RAO  Chunhua SHI  Dong GUO  Ji WANG  Zhuoqi LIANG  Tian WANG 《大气科学进展》2022,39(10):1623-1636

It is still not well understood if subseasonal variability of the local PM_2.5 in the Beijing-Tianjin-Hebei (BTH) region is affected by the stratospheric state. Using PM_2.5 observations and the ERA5 reanalysis, the evolution of the air quality in BTH during the January 2021 sudden stratospheric warming (SSW) is explored. The subseasonal variability of the PM_2.5 concentration after the SSW onset is evidently enhanced. Stratospheric circumpolar easterly anomalies lasted for 53 days during the January–February 2021 SSW with two evident stratospheric pulses arriving at the ground. During the tropospheric wave weakening period and the intermittent period of dormant stratospheric pulses, the East Asian winter monsoon weakened, anomalous temperature inversion developed in the lower troposphere, anomalous surface southerlies prevailed, atmospheric moisture increased, and the boundary layer top height lowered, all of which favor the accumulation of pollutant particulates, leading to two periods of pollution processes in the BTH region. In the phase of strengthened East Asian winter monsoon around the very beginning of the SSW and another two periods when stratospheric pulses had reached the near surface, opposite-signed circulation patterns and meteorological conditions were observed, which helped to dilute and diffuse air pollutants in the BTH region. As a result, the air quality was excellent during the two periods when the stratospheric pulse had reached the near surface. The increased subseasonal variation of the regional pollutant particulates after the SSW onset highlights the important role of the stratosphere in the regional environment and provides implications for the environmental prediction.  相似文献   

2020年11月大气环流和天气分析     

南洋  饶晓琴  尤媛  关良 《气象》2021,(2):253-260

2020年11月大气环流的主要特征为:北半球极涡呈偶极分布,环流呈三波型,东亚大槽偏弱,南支槽偏弱,西太平洋副热带高压偏西偏强。全国平均降水量为16.9 mm,比常年同期(19.0 mm)偏少11%,月内17—19日出现了一次强雨雪天气过程,湖北恩施建始县和辽宁丹东出现大暴雨,黑龙江牡丹江、鸡西和七台河、内蒙古通辽和赤峰等地出现大暴雪或特大暴雪。全国平均气温为3.9℃,比常年同期(2.9℃)偏高1℃,11月共出现4次冷空气过程,其中1次为全国强冷空气过程(18—22日)。10—17日,大气扩散条件较为不利,华北中南部、黄淮西部、汾渭平原等地发生一次雾-霾天气过程。  相似文献   

塔里木盆地西克尔中奥陶统礁滩相储层成岩特征与系统划分          下载免费PDF全文

周 刚 郑荣才 罗 平 赵先超 刘 伟宋金民  饶红娟 《中国地质》2012,39(1):135-145

通过对塔里木盆地西克尔地区中奥陶统生物礁滩成岩作用方式、成岩演化序列和相对应的地质作用产物、组合及稀土元素和碳、氧、锶稳定同位素地球化学特征综合研究,按"水文体制"将生物礁滩地层划分为不同成岩阶段的近地表海水-海源地层水、大气淡水、温压水和油田卤水4个成岩系统。各成岩系统流体来源、性质、水-岩石相互作用过程及其对储层的影响各不相同,其中与储层发育密切相关的成岩体系和成岩方式主要为:古表生期大气水成岩系统的岩溶作用、再埋藏成岩阶段温压水成岩系统和油田卤水成岩系统的深部溶蚀和各期构造破裂作用。  相似文献