气候变暖对黑龙江省水稻发展的影响及其对策的研究   总被引：8，自引：0，他引：8  

潘华盛  张桂华  祖世亨 《黑龙江气象》2002,(4):7-12,18

80年代气候变暖使黑龙江省热量明显增加，尤其黑龙江、松花江、乌苏里江流域热量增加明显。气候变暖使三江平原东北部降水有不同程度的增加。分析全省地表径流、旱涝区划，提出了水稻发展的最佳种植区。并根据目前水资源和最大供水量状况，预测了黑龙江省2010年发展水稻种植面积为2000年的160％，进而指出发展水稻种植的重点应放在黑龙江下游，挠力河与乌苏里江之间。  相似文献   

VARIATIONS OF ATMOSPHERIC OSCILLATION FACTORS AND 500 HPA CIRCULATION PATTERNS AND THEIR RELATIONS^*          下载免费PDF全文

YAN Huasheng  WAN Yunxi  CHENG Jiangang 《Acta Meteorologica Sinica》2004,18(4):411-422

Wavelet analysis,EOF and CCA are used to analyze the variations of atmospheric circulation factors,including the key atmospheric oscillations,W,C,E and subtropical high (SH),and their relationships.The results are shown that the variations of atmospheric circulation factors both in troposphere and lower atmosphere layer are different on different time scales.The most significant variation of atmospheric circulation factors is in the period less than 7 years.The correlation relations of atmospheric circulation factors are different on different time scales.Combination patterns of circulation factors have impact on the relationships of factors.There are lag correlations between combination patterns of circulation factors in former year and that of in next year.  相似文献   

Interannual and Interdecadal Variations in Atmospheric Circulation Factors and Rainfall in China and Their Relationship   总被引：4，自引：0，他引：4  

YAN Huasheng  WAN Yunxi  CHENG Jiangang 《Acta Meteorologica Sinica》2005,19(2):253-261

Wavelet analysis is used to study the interannual and interdecadal variations of rainfall in China and atmospheric circulation factors, including the key atmospheric oscillations, W, C, E patterns and subtropical high. Regression analysis and correlation analysis are both used to study the relationship of atmospheric circulation factors and China rainfall on different time scale and spatial scale. The results are as follows: (1) The variations of atmospheric circulation and rainfall in China are characterized by interannual and interdecadal scales. The variations of atmospheric circulation and rainfall are composed of interannual and interdecadal variations. It is necessary to separate those two time scales when climate changes and forecast are studied. (2) The variations of China rainfall are due to the interaction of multi-factors rather than single factors. The marked factors which influence the interannual and interdecadal variations are various. Subtropical high is one of the marked factors which influence interannual variations of rainfall, while AO, NAO, and NPO are one of the marked factors which influence interdecadal variations of rainfall. (3) The longer the time scale is, and the larger the spatial scale is, and the more remarkable the relationships between atmospheric circulation and rainfall are.  相似文献   

Bioavailability of dissolved organic phosphorus compounds to typical harmful dinoflagellate Prorocentrum donghaiense Lu   总被引：1，自引：0，他引：1  

Bangqin Huang  Linjian Ou  Huasheng Hong  Haiwei Luo  Dazhi Wang 《Marine pollution bulletin》2005,51(8-12):838

The bioavailability of dissolved organic phosphorus (DOP) compounds to harmful alga Prorocentrum donghaiense Lu and its alkaline phosphatase activity (APA) were studied. Results showed that P. donghaiense could utilize the test DOP compounds such as glucose-6-phosphate (G-6-P), adenosine triphosphate (ATP) and ribonucleic acid (RNA) to sustain its growth. Nutrition between the test DOP compounds and orthophosphate was comparable. P. donghaiense could utilize intracellular phosphorus to sustain growth under depletion of dissolved phosphorus. Variation of APA in different test DOP compounds was addressed; the controlling mechanism of APA in different DOP media was discussed.  相似文献   

多因变量矩阵回归预报方法   总被引：2，自引：0，他引：2       下载免费PDF全文

严华生  张永昆  曹杰  谢应齐  尤卫红 《大气科学》1997,21(4):493-498

本文针对一个因变量多元回归在气象预报应用中的不足和局限，引入多因变量多元回归，讨论了应用中的公共预报因子问题和因子筛选问题，并对多因变量回归与单因变量回归、场展开预报、逐步回归、逐段回归等方法进行了比较，探讨了其特点及应用效果。  相似文献   

月雨量的可预报性估算试验   总被引：4，自引：0，他引：4  

尤卫红  严华生  伍从斌 《热带气象学报》1995,11(1):73-79

根据广东省各地区气象条件的差异，森林面积的大小、森林火灾出现的严重程度，参照树种的分布，将全省划分为５个区域，在各区域内造若干代表站点，将代表站点所收集到的火灾样本资料分别与当地气象因子建立相关系，获得火险等级评价指数，并根据指数的大小，预报未来各地区的火险等级，从而达到对广东各地进行林火分区预报的目的。  相似文献   

云南省5月份雨量的天气气候成因探讨   总被引：24，自引：1，他引：24       下载免费PDF全文

严华生  琚建华 《应用气象学报》1995,6(1):124-128

该文探讨了影响云南5月雨量的大气环流背景、天气气候成因，指出大气环流季节性转换、ITCZ、南亚高压、西太平洋副高等是大气环流背景;夏季风和西风槽相互作用、北方冷空气与南方暖湿气流相互作用是天气气候成因。以此为预报思路，得出一个云南5月雨量长期预报模式。  相似文献   

Analytic stage–discharge formulae for flow in straight trapezoidal open channels     

Huasheng Liao  Donald W. Knight 《Advances in water resources》2007

Analytic stage–discharge formulae are derived for flow in straight trapezoidal channels, based on the 2D analytic velocity distribution in open channels given by Shiono and Knight [Shiono K, Knight DW, Turbulent open-channel flows with variable depth across the channel. J Fluid Mech 1991;222:617–46]. A simple hand-calculation method is provided. Legendre incomplete elliptic integrals of the first and second kinds and a binomial series expansion are used in the derivation of these analytic formulae, together with physically based hydraulic parameters, such as local friction factor (f), dimensionless eddy viscosity (λ) and secondary flow (Γ). The stage–discharge results obtained from the formulae are shown to be in good agreement with experimental data, as are the corresponding analytic velocity and boundary shear stress distributions. The influences of f, λ and Γ on the stage–discharge relationship are also discussed.  相似文献   

DEM曲面内插组合方法的研究     

杜漫飞  孙华生 《测绘与空间地理信息》2018,(7):79-82

数字高程模型广泛应用于测绘科学各个领域,如何建立模型并高效率地进行内插成为现在研究的热点问题。文中以辽宁省黑山市调兵山地区三维坐标采集数据为基础,使用多项式曲面内插法、加权平均法和组合方法进行内插,对比内插精度,验证加权平均对多项式内插精度的影响,研究组合方法的可行性,找出适合实验区域的内插方法。研究结果表明:在实验区域使用多项式和加权平均内插方法时加权平均方法内插精度最高;加权平均方法能较好地优化多项式内插精度;组合方法中加权双三次多项式内插方法能较好地削弱地势对精度的影响,是一种适合实验区域的方法。  相似文献   

建筑物群集对象的改进型棱柱模型表达     

霍志敏  史云飞  张玲玲  聂庆微  吕春光  孙华生 《测绘科学》2021,46(10):137-144

针对B-Rep模型表达建筑物群集对象存在数据量大、更新和维护困难等问题,该文提出了一种专用于建筑物群集对象表达的改进型棱柱模型.该模型对原始棱柱模型进行改进,改进后的模型由棱柱和基底组成,且棱柱的上、下边界由一到多个表面构成.进一步提出了基于改进型棱柱模型的群集对象构建方法,该方法通过接合图生成、内部点提取和点投影生成建筑物群集对象的三维模型.试验结果表明,在不需要侧面信息情况下,改进型棱柱模型可以代替B-Rep表达群集对象,并且随着群集对象房间数的增大,比B-Rep更加节约存储空间.  相似文献