基于Origin的渗透系数衰减方程在地热水回灌中的应用     

赵鹏飞 《地质与资源》2021,30(1):71-74

孔隙型热储层的回灌过程中,由于物理堵塞、生物化学堵塞、悬浮物堵塞和气体堵塞,热储层的渗透性下降,回灌能力变弱.为了定量查明渗透系数的衰减,以辽南地区某回灌试验为例,使用Origin软件计算出研究区渗透系数衰减方程,在此基础上计算了回灌井灌压-时间关系曲线和回扬周期.研究表明,利用Origin软件求取渗透系数衰减方程具有方便快捷、规范性好等优点,可在回灌试验数据处理中推广使用.  相似文献   

污水源热泵技术在城市住宅供暖中的应用研究     

于浩  刘静  肖天鹏 《城市地质》2015,(4):21-24

随着城市的发展和能源需求的增长,污水的热能回收利用越来越受到关注,开发污水源热泵技术对建筑节能降耗具有重要意义。本文就污水源热泵系统的工作原理、特点等方面进行了介绍,阐述了国内外污水源热泵技术的开发利用历程与工程现状,分析了城市污水热能资源潜力以及污水源热泵技术的发展前景,指出利用污水与环境的温差获取热能具有十分巨大的能量资源前景,适宜的热源距离是污水源热泵开发利用的先决条件,开发污水源热泵系统,可以充分利用城市污水处理厂的二级出水或城市污水作为水源,通过合理利用出水的流量和温差为城市住宅供暖。基于我国能源与环境的现状,污水源热泵系统具有良好的市场前景,是一种值得推广的能源开发利用方式。  相似文献   

共线SPDC下剩余脉冲泵浦光滤光特性研究     

白云  权润爱  张羽  侯飞雁  刘涛  张首刚  董瑞芳 《时间频率学报》2014,(1):1-9

从宽带脉冲泵浦光的光谱及滤光片的滤光特性参数出发,分析了自发参量下转换（SPDC）产生纠缠光源的系统中各类滤光片对剩余脉冲泵浦光的滤除效率。分析结果表明,适当组合不同类型的滤光片可以有效地滤除剩余脉冲泵浦光,并从实验上验证了分析结果的正确性。该研究为脉冲泵浦光条件下SPDC过程产生的纠缠光源的有效测量提供了理论指导和实验验证。  相似文献   

Deep ocean fluxes and their link to surface ocean processes and the biological pump     

T. Rixen  M.V.S. Guptha  V. Ittekkot 《Progress in Oceanography》2005,65(2-4):240

Intense studies of upper and deep ocean processes were carried out in the Northwestern Indian Ocean (Arabian Sea) within the framework of JGOFS and related projects in order to improve our understanding of the marine carbon cycle and the ocean’s role as a reservoir for atmospheric CO₂. The results show a pronounced monsoon-driven seasonality with enhanced organic carbon fluxes into the deep-sea during the SW Monsoon and during the early and late NE Monsoon north of 10°N. The productivity is mainly regulated by inputs of nutrients from subsurface waters into the euphotic zone via upwelling and mixed layer-deepening. Deep mixing introduces light limitation by carrying photoautotrophic organisms below the euphotic zone during the peak of the NE Monsoon. Nevertheless, deep mixing and strong upwelling during the SW Monsoon provide an ecological advantage for diatoms over other photoautotrophic organisms by increasing the silica concentrations in the euphotic zone. When silica concentrations fall below 2 μmol l⁻¹, diatoms lose their dominance in the plankton community. During diatom-dominated blooms, the biological pathway of uptake of CO₂ (the biological pump) appears to be more efficient than during blooms of other organisms, as indicated by organic carbon to carbonate carbon (rain) ratios. Due to the seasonal alternation of diatom and non-diatom dominated exports, spatial variations of the annual mean rain ratios are hardly discernible along the main JGOFS transect.Data-based estimates of the annual mean impact of the biological pump on the fCO₂ in the surface water suggest that the biological pump reduces the increase of fCO₂ in the surface water caused by intrusion of CO₂-enriched subsurface water by 50–70%. The remaining 30 to 50% are attributed to CO₂ emissions into the atmosphere. Rain ratios up to 60% higher in river-influenced areas off Pakistan and in the Bay of Bengal than in the open Arabian Sea imply that riverine silica inputs can further enhance the impact of the biological pump on the fCO₂ in the surface water by supporting diatom blooms. Consequently, it is assumed that reduced river discharges caused by the damming of major rivers increase CO₂ emission by lowering silica inputs to the Arabian Sea; this mechanism probably operates in other regions of the world ocean also.  相似文献   

North Pacific Synthesis of the Joint Global Ocean Flux Study: Overview     

Toshiro Saino  Alexander Bychkov  Chen-Tung Arthur Chen  Paul J. Harrison 《Journal of Oceanography》2004,60(1):1-4

This special issue is comprised of 13 papers, including this overview, and focuses on the synthesis of the Joint Global Ocean Flux Study (JGOFS) in the North Pacific which took place from 1997 through 2003. The effort was led by the JGOFS North Pacific Synthesis Group, with the aim of quantifying CO₂ drawdown by physical and biological pumps in the North Pacific by identifying and studying the regional, seasonal to inter-annual variations in the key processes, and understanding their regulating mechanisms. Emphasis was placed on the similarities and differences of the biogeochemical regimes in the eastern and western subarctic Pacific. Effort was also made to address the future research directions which arose from the scientific findings during the North Pacific JGOFS process study. A brief overview of the papers from view points of CO₂ drawdown by physical and biological pumps, spatial variability, and temporal variability from seasonal to decadal scales is made, followed by suggestions for the directions of future research. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

水槽造流系统水力计算与泵机选择   总被引：1，自引：0，他引：1  

孙东昌  张亭健  辛海英 《海洋科学进展》2002,20(2):125-132

提供一种完整的用于试验水槽造流系统的水力计算和泵机选择方法 ,可用于其他类似工程设计。  相似文献   

Roles of Biogeochemical Processes in the Oceanic Carbon Cycle Described with a Simple Coupled Physical-Biogeochemical Model   总被引：1，自引：0，他引：1  

Masahiko?FujiiEmail author  Motoyoshi?Ikeda  Yasuhiro?Yamanaka 《Journal of Oceanography》2005,61(5):803-815

To evaluate the contribution of biogeochemical processes to the oceanic carbon cycle and to calculate the ratio of calcium carbonate to organic carbon downward export, we have incorporated biological and alkalinity pumps in the yoked high-latitude exchange/interior diffusion-advection (YOLDA) model. The biogeochemical processes are represented by four parameters. The values of the parameters are tuned so that the model can reproduce the observed phosphate and alkalinity distributions in each oceanic region. The sensitivity of the model to the biogeochemical parameters shows that biological production rates in the euphotic zone and decomposition depths of particulate matters significantly influence horizontal and vertical distributions of biogeochemical substances. The modeled vertical fluxes of particulate organic phosphorus and calcium carbonate are converted to vertical carbon fluxes by the biological pump and the alkalinity pump, respectively. The downward carbon flux from the surface layer to the deep layer in the entire region is estimated to be 3.36 PgC/yr, which consists of 2.93 PgC/yr from the biological pump and 0.43 PgC/yr from the alkalinity pump, which is consistent with previous studies. The modeled rain ratio is higher with depth and higher in the Pacific and Indian Oceans than in the Atlantic Ocean. The global rain ratio at the surface layer is calculated to be 0.14 to 0.15. This value lies between the lower and higher ends of the previous estimates, which range widely from 0.05 to 0.25. This study indicates that the rain ratio is unlikely to be higher than 0.15, at least in the surface waters.  相似文献   

气举技术应用于深海无隔水管泥浆回收钻井工艺可行性分析          下载免费PDF全文

陈浩文  于彦江  王艳丽  秦如雷  田烈余  王偲  殷国乐  王林清  谢文卫  冯起赠 《探矿工程》2022,49(2):9-15

无隔水管泥浆回收钻井技术作为新兴钻井技术,具有安全环保、简化井身结构和降低钻探风险等优点。传统的无隔水管泥浆回收钻井技术依靠水下泵将海底井口泥浆举升至甲板面,该方式对水下泵的举升能力及可靠性要求极高。未来深海钻井领域,水下泵将会是限制无隔水管泥浆回收钻井技术应用的“瓶颈”。本文借鉴陆地气举反循环钻井原理,利用气举技术部分或完全替代水下泵,分别从设备技术现状、流量可调性、适用环境、井控安全等方面探究气举用于无隔水管泥浆回收技术的可行性。结果表明,气举反循环技术及相关设备性能满足无隔水管泥浆回收的使用要求,而且具有上返流量可调、安全等特点,有较高的研究应用价值。  相似文献   

上海地源热泵系统对地质环境的热影响分析     

高世轩 《上海国土资源》2012,33(1):67-70

根据地源热泵工程试验场两年监测数据,分析了地下换热区地温场分布特征以及地源热泵系统短期运行对地质环境的热影响效应。换热区地温场分布主要受气温、建筑冷热负荷、原始地温、岩土导热系数、与换热孔距离等因素影响。在吸排热比基本平衡的条件下,地源热泵系统对地质环境的热影响较小。选择合理的埋管间距,充分利用地源热泵的热回收功能,采用冷却塔—地埋管、地表水—地埋管等复合系统,有助于消除吸排热比不平衡现象。  相似文献   

Numerical flow and performance analysis of a water-jet axial flow pump   总被引：1，自引：0，他引：1  

Hong Gao  Wanlai Lin  Zhaohui Du 《Ocean Engineering》2008,35(16):1604-1614

The purpose of the present study is to investigate the performance and three-dimensional flow fields in a water-jet pump. TASCflow is employed to simulate the rotator-stator coupling flow field. A standard k-ε turbulence model combined with standard wall functions is used. In order to investigate the effect of a rear stator on flow fields, the flows in two water-jet pumps with and without a rear stator are studied. Computational fluid dynamics (CFD)-predicted overall performances are in good agreement with the experimental results. Then the flow fields, such as the pressure distribution on the blade surfaces, and the axial and tangential velocity distribution, especially the radial loading distribution, are investigated at different flow rates. In addition, the effects of a rear stator and different spacings between the rotor and the stator on the overall performance and the flow fields of the water-jet pump are also investigated.  相似文献