Development of a 50-year daily surface solar radiation dataset over China   总被引：1，自引：0，他引：1  

TANG WenJun  YANG Kun  QIN Jun  MIN Min 《中国科学:地球科学(英文版)》2013,(9):1555-1565

Although solar radiation is a crucial parameter in designing solar power devices and studying land surface processes,long-term and densely distributed observations of surface solar radiation are usually not available.This paper describes the development of a 50-year dataset of daily surface solar radiation at 716 China Meteorological Administration(CMA) stations.First,a physical model,without any local calibration,is applied to estimate the daily radiation at all 716 CMA routine stations.Then,an ANN-based(Artificial Neural Network) model is applied to extend radiation estimates to earlier periods at each of all 96 CMA radiation stations.The ANN-based model is trained with recent reliable radiation data and thus its estimate is more reliable than the physical model.Therefore,the ANN-based model is used to correct the physical model dynamically at a monthly scale.The correction generally improves the accuracy of the radiation dataset estimated by the physical model:the mean bias error(MBE) averaged over all the 96 radiation stations during 1994-2002 is reduced from 0.68 to 0.11 MJ m-2 and the root mean square error(RMSE) from 2.01 to 1.80 MJ m-2.The new radiation dataset shows superior performance over previous estimates by locally calibrated ngstr m-Prescott models.Based on the new radiation dataset,the annual mean daily solar radiation over China is 14.3 MJ m-2.The maximal seasonal mean daily solar radiation occurs in the Tibetan Plateau during summer with a value of 27.1 MJ m-2,whereas the minimal seasonal mean daily solar radiation occurs in the Sichuan Basin during winter with a value of 4.7 MJ m-2.  相似文献   

Hydrodynamic Evolution and Hydrocarbon Accumulation in the Dabashan Foreland Thrust Belt,China   总被引：1，自引：0，他引：1  

ZENG Jianhui  GUO Kai  TIAN Kun  and XU Tianwu 《《地质学报》英文版》2012,86(4):912-923

There are two plays in the Dabashan foreland tectonic belt: the upper and the lower plays. The lower play experienced one sedimentary hydrodynamic stage, two burial hydrodynamic stages, two tectonic hydrodynamic stages and two infiltration hydrodynamic stages from the Sinian to the Cenozoic, while the upper play had one sedimentary hydrodynamic stage, one burial hydrodynamic stage, two tectonic hydrodynamic stages and one infiltration hydrodynamic stage from the Permian to the Cenozoic. Extensive flows of both sedimentary water, including hydrocarbons, and deep mantle fluid occurred in the Chengkou faults during collision orogeny in the Middle-Late Triassic Indosinian orogeny, and fluid flow was complicated during intracontinental orogeny in the Middle-Late Jurassic. In addition to these movements, infiltration and movement of meteoric water took place in the Chengkou faults, whereas in the covering-strata decollement tectonic belt, extensive sedimentary water flow (including hydrocarbons) occurred mainly in the Zhenba and Pingba faults. During the stage of rapid uplift and exhumation from the Cretaceous to the Cenozoic, the fluid flow was characterized mainly by infiltration of meteoric water and gravity-induced flow caused by altitude difference, whereas sedimentary water flow caused by tectonic processes was relatively less significant. Sedimentary water flow was more significant to the lower play in hydrocarbon migration and accumulation during collision orogeny in the Middle-Late Triassic Indosinian orogeny, but its influence is relatively slight on the upper play. On one hand, hydrodynamics during intracontinental orogeny in the Middle-Late Jurassic adjusted, reformed or oven destroyed oil reservoirs in the lower play; on the other hand, it drove large amounts of hydrocarbons to migrate laterally and vertically and is favorable for hydrocarbon accumulation. Infiltration hydrodynamics mainly adjusted and destroyed oil reservoirs from the Cretaceous to the Cenozoic.  相似文献   

Effects of Urbanization on Groundwater Quality of Laolongdong Watershed     

REN Kun  SHI Yang  WANG Fengkang 《《地质学报》英文版》2013,87(Z1):649-649

  相似文献   

Turning depths of internal tides in the South China Sea inferred from profile data     

Kun Liu  Lianglong Da  Wuhong Guo  Chenglong Liu  Junchuan Sun 《海洋学报(英文版)》2022,41(2):139-146

Theoretically, propagating internal tides in the ocean may reflect at turning depths, where buoyancy frequencies equal tidal frequencies, before colliding with the air-sea interface or rugged bottom topography. Globally, the internal tide lower turning depths（ITLTDs） in the open ocean have been mapped; however, knowledge of the presence of ITLTDs in the South China Sea（SCS） is lacking. In this study, 2 125 high-quality temperature-salinity profiles（including 58 deep-sea hydrographic measurements...  相似文献   

Establishment of digital model for dynamic simulation analysis on hydraulic impact perforator     

WANG Qing-yan  YIN Kun  CHEN Bao-yi  JI Sheng-li College of Construction Engineering  Jilin University  Changchun  Jilin  China 《东北亚地学研究》2005,(Z1)

Hydraulic impact perforator is powerful tools for trenchless project. It has advantages in cabinet structure, low cost, long life and easy protected. Compared with pneumatic DTH, the hydraulic impact spear worked under high pressure and using uncompressible fluid thusgreater impact energy and higher efficiency can be supported. The authors founded the dynamic simulation model of HDI-146 hydraulic impact spear. The project for solving the differential equation was suggested also. By means of virtual machine technology, the dynamic mechanism of HDI-146 can be explored and tutoring us to optimize the structural parameters can be made.  相似文献   

我国散射照度的计算及其地区分布     

吴其劻 《气象学报》1990,48(3):369-373

散射光照度与农业生产、建筑采光等均有密切关系。然而由于没有常规的光气候资料,我国散射照度时空分布状况,至今尚无人研究。 目前,国内外是根据一些日射站进行的照度与太阳辐射同步观测资料,在获得辐射光当量的基础  相似文献   

Analysis of Wave Loads on A Semi-Submersible Platform   总被引：10，自引：0，他引：10  

QIAN  Kun 《中国海洋工程》2002,16(3):395-406

For the global and structural fatigue strength analysis of a semi-submersible platform, wave loads under design conditions are calculated by use of the three-dimensional boundary element method. Methods for calculating the forward-speed free-surface Green function are discussed and a computer program with this Green function is developed. According to the special rules, the wave loads under several typical design conditions of the platform are calculated. The maximum vertical bending moment, torsion moment and horizontal split force are determined from a series of contour maps of wave loads for the wave period of 5 to 18 seconds at a certain interval and the wave phase of 0°to 360°at a certain interval. The wave height is determined by the function of wave period with a given exceedance probability. The maximum wave loads under the combination of wave parameters are used as the input of hydrodynamic pressure in the three-dimensional finite element analysis process. The transfer functions of wave loads  相似文献   

Scour of the Seabed Under A Pipeline in Oscillating Flow   总被引：3，自引：0，他引：3  

PU  Qun 《中国海洋工程》2001,(1):129-138

The scour of the seabed under a pipeline is studied experimentally in this paper. Tests are carried out in a U-shaped oscillatory water tunnel with a box imbedded in the bottom of the test section. By use of the standard sand, clay and plastic grain as the seabed material, the influence of the bed material on the scour is studied. The relationship between the critical initial gap-to-diameter ratio above which no scour occurs and the parameters of the oscillating flow is obtained. The self-burial phenomenon, which occurs for the pipeline not fixed to two sidewalls of the test section, is not observed for the fixed pipeline. The effect of the pipe on sand wave formation is discussed. The maximum equilibrium scour depths for different initial gap-to-diameter ratios, different Kc numbers and different bed sands are also given in this paper.  相似文献   

Establishment of digital model for dynamic simulation analysis on hydraulic impact perforator     

WANG Qing-yan YIN Kun CHEN Bao-yi JI Sheng-li 《东北亚地学研究》2005,8(1):138-141

Hydraulic impact perforator is powerful tools for trenchless project. It has advantages in cabinet structure, low cost, long life and easy protected. Compared with pneumatic DTH, the hydraulic impact spear worked under high pressure and using uncompressible fluid thusgreater impact energy and higher efficiency can be supported. The authors founded the dynamic simulation model of HDI-146 hydraulic impact spear. The project for solving the differential equation was suggested also. By means of virtual machine technology, the dynamic mechanism of HDI-146 can be explored and tutoring us to optimize the structural parameters can be made.  相似文献   

A 3D magnetotelluric inversion system with a theoretical assessment in oil and gas exploration     

ZHANG Kun  YAN Jiayong 《《地质学报》英文版》2015,89(Z1):434-436

<正>1 Introduction Magnetotelluric(MT)is a geophysics method for oil exploration,which measures the surface orthogonal electric and magnetic fields base on the electromagnetic induction and natural electromagnetic fields.The data process and inversion methods are developed.The static shift effect is a very common phenomenon in  相似文献