Transport of waste heat from a nuclear power plant into coastal water     

Ping Zeng  Huiquan Chen  Baichuan Ao  Ping Ji  Xiaojian Wang  Zhiliang Ou 《Coastal Engineering》2002,44(4)

A numerical and experimental modeling is presented for studying the transport of waste heat from a nuclear power plant into coastal water by using a full-field physical model with scale distortion, a local physical model with normal scale and a depth-averaged k− turbulence model with a modified second-order upwind scheme. Field investigations are also used to provide the calibration and validation of the modeling. A case study simulating the turbulent tidal flow and waste heat transport in the coastal water near Daya Bay Nuclear Power Plant in Southern China was conducted. The experimental result of the case study shows that the water temperature in coastal water was a little oversimulated near the surface and was a little undersimulated near the bottom of heated-water layer by the full-field physical model. The numerical study shows that the depth-averaged k− turbulence model presented a satisfied prediction of turbulent tidal flow and far-field temperature distribution in coastal water, although the near-field stratification due to the heated water effluent was not accounted for. The result of the effect of scale distortion on physical model shows that a full-field physical model with a scale distortion of 10 produced a satisfied result of temperature distribution in the present case study.  相似文献   

Ensemble Numerical Simulations of Realistic SEP Events and the Inspiration for Space Weather Awareness     

Chenxi Du  Xianzhi Ao  Bingxian Luo  Jingjing Wang  Chong Chen  Xin Xiong  Xin Wang  Gang Li 《天文和天体物理学研究(英文版)》2022,(2):29-44

The solar energetic particle(SEP)event is a kind of hazardous space weather phenomena,so its quantitative forecast is of great importance from the aspect of spa...  相似文献   

乌拉特中旗一次寒潮天气过程分析   总被引：1，自引：0，他引：1  

敖勇 《内蒙古气象》2010,(5):21-22

通过对乌拉特中旗2010年3月13—15日的寒潮天气过程,应用天气学原理和方法进行诊断分析,总结出阻高崩溃型寒潮天气过程形成发展的特点以及预报着眼点。  相似文献   

乌拉特中旗一次强沙尘暴天气成因分析     

敖勇 《内蒙古气象》2010,(4):17-19

利用常规气象观测资料、亚欧天气分析图,对2010年3月19日的一次由蒙古冷涡强烈发展而引发的强沙尘暴天气过程,从天气学成因、动力机制等方面进行分析。表明,强冷空气的卷入使蒙古冷涡强烈发展,为沙尘暴的发生提供了动力条件;蒙古冷涡的垂直结构提供了动量下传机制,在地面冷锋后部形成大风区,为沙尘暴的形成提供了基本条件。通过对这次蒙古冷涡引发的强沙尘暴天气过程的分析,找出蒙古冷涡引发的沙尘暴天气过程的一些特点和预报着眼点。  相似文献   

Possible solar forcing of 400-year wet–dry climate cycles in northwestern China     

Jinglu Wu  Zicheng Yu  Hai’Ao Zeng  Ninglian Wang 《Climatic change》2009,96(4):473-482

Here we present a multi-proxy paleolimnological record from a closed-basin lake (Ebinur Lake) in northwestern China to investigate climate change in this arid region during the last 1,500 years. The 120-cm long sediment core was dated by AMS radiocarbon and ²¹⁰Pb methods. The fine-grained clay sediments contain 3–17% organic matter (OM) and 9–31% carbonate, and are interrupted by multiple sand and silt layers. These sand/silt layers, having consistently low OM, were found at 700–800, 1000–1100, 1300–1400, and 1700–1750 a.d., with a time spacing of 300–400 years. We interpret that the low OM sand/silt layers were deposited during higher lake levels caused by increased river inflow from the surrounding mountains during wet climate intervals. This interpretation is supported by concurrent decreases in δ ¹⁸O and δ ¹³C of bulk carbonate and in carbonate content. Wet climate intervals at 700–800 a.d. and at 1700–1750 a.d. also correlate with elevated snow accumulation and low δ ¹⁸O from Guliya ice core on the NW Tibetan Plateau, both regions strongly influenced by the westerlies. This approximate 400-year periodicity of wet–dry climate oscillations appear to correlate with solar activity as shown by atmosphere ¹⁴C concentration and with paleo-moisture records in interior North America. Our results suggest that solar activities might have played a significant role in driving wet–dry climate oscillations at centennial scales in the interior of Eurasian continent.  相似文献   

库尔勒5.8级地震前地震波特性的某些短期变化          下载免费PDF全文

王桂岭  敖雪明  杨成荣 《地震工程学报》1984,6(3):27-34

本文对新疆1978年4月22日库尔勒5.8级地震前地震波的动力学特性和运动学特性的某些短期变化进行了初步研究。重点讨论了5.8级地震前通过孕震区的小地震的直达波振幅比、振动持续时间比以及波速比的短期异常变化,並且,结合震前短期地震活动异常图象作了对比分析。实际观测结果表明,较大地震发生前,通过孕震区的小震的地震波特性可能出现一些较明显的短期异常变化,因而,对此进行研究无疑对于探讨地震孕育过程和地震的预报途径都是有意义的。  相似文献   

STUDY ON CORRELATIVE EARTHQUAKES AND SEISMIC WINDOW NETWORK IN TIANSHAN REGION     

Wang Gulling Ao Xueming 《内陆地震》1991,(4)

In this paper , by using the seismic data of strong earthquake (M≥7) which have occurred since 1900,correlative features of strong earthquake activity in Tianshan region which crosses China and USSR have been studied . Meanwhile , we selected 15 seismic windows (11 in China , 4 in USSR) by censusing , systematically researching and statistically examing seismic data of regional seismic network which are in Chian and USSR.The anomalous features of seismic window and seismic window network , prediction index and prediction plan have been studied . In the same time ,its prediction efficency have been evaluated . Several examples of successful earthquake prediction are given out in this paper .Finally ,the possible physical mechanism of the results are discussed.  相似文献   

基于图像处理技术的岩心裂缝图像提取     

王任一  敖先锋  石晓燕  李凤云 《新疆地质》2006,24(4):458-459

基于数字图像处理技术,利用油田大量现场岩心纵向(或平面)劈开面图像资料,可直接分离出岩心剖面上裂缝信息.最大类间方差法的二值化算法是基于类间方差达到最大为准则,采用该法获得了理想的二值化效果,较准确地从岩心剖面中提取出裂缝图像信息.  相似文献   

塔北沙西—轮台地区亚格列木组砂岩沉积相及储层评价   总被引：1，自引：0，他引：1  

赵敖山  丁勇  赵胜利 《新疆地质》1999,(3)

沙雅西—轮台地区卡普沙良群亚格列木组为一套棕红色陆相碎屑岩沉积,包括冲积扇、辫状河、三角洲、辫状河三角洲和砾质滨岸等沉积体系,多呈扇形。岩性较粗,通常具有较高的原始孔隙度,是有利的油气储集体,按储层的好坏可分为4类储层区。  相似文献   

Extraction and spatiotemporal evolution analysis of tidal flats in the Bohai Rim during 1984-2019 based on remote sensing     

XU Haijue  JIA Ao  SONG Xiaolong  BAI Yuchuan 《地理学报(英文版)》2023,33(1):76-98

Tidal flats, a precious resource that provides ecological services and land space for coastal zones, are facing threats from human activities and climate change. In this study, a robust decision tree for tidal flat extraction was developed to analyse spatiotemporal variations in the Bohai Rim region during 1984-2019 based on 9539 Landsat TM/OLI surface reflection images and the Google Earth Engine (GEE) cloud platform. The area of tidal flats significantly fluctuated downwards from 3551.22 to 1712.36 km² in the Bohai Rim region during 1984-2019, and 51.31% of tidal flats were distributed near the Yellow River Delta and Liaohe River Delta during 2017-2019. There occurred a drastic spatial transition of tidal flats with coastline migration towards the ocean. Low-stability tidal flats were mainly distributed in reclamation regions, deltas, and bays near the estuary during 1984-2019. The main factors of tidal flat evolution in the Bohai Rim region included the direct impact of land cover changes in reclamation regions, the continuous impact of a weakening sediment supply, and the potential impact of a deteriorating sediment storage capability. The extraction process and maps herein could provide a reference for the sustainable development and conservation of coastal resources.  相似文献