THE CHARACTERISTICS OF RAINFALL AND DISASTERS OF DEBRIS FLOW IN BEIJING AREA     

PANG Bingdong Assoc. Prof Dept. Of Basic Sciences  Beijing Insitute of Meteorology  Beijing  China 《国际泥沙研究》1997,(3)

LINTRODUCTIONDisastersofdebrisflotvoccurfrequentlyinChina.Mostofthemareinrainstormtype.TherainStormdebrisflowiscausedbyStormrainfallthatinducesastrongStreamflowsonloosematerialsinwatershed.Theeffectsofprecipitationonthedebrisflowareasfollows(ChengduResearchInstituteC;DisasterandEnvironment,1989)f(l)Precipitationacceleratesthematerialsofloosedebristogather,(2)PrecipitationsuPPlywatercomponentofdebrisflow,(3)Precipitationprovidesdynamicconditionsfordebrisflow,(4)Precipitationisatrigg…  相似文献   

固体—液体层分界面处的P、SV型面波     

卓乐芳 《地球科学与环境学报》1999,21(3):71

针对半无限弹性固体—液体层分界面处 Ｐ、 Ｓ Ｖ 型面波不同的数学表达进行了分析研究，认为在有些著作中将它们统称为瑞利波是不够严密的，指出瑞利波和斯通利波是固体—液体层分界面处 Ｐ、 Ｓ Ｖ 型面波的两种极限情况。  相似文献   

Panel positioning error and support mechanism for a 30-m THz radio telescope     

Daniel Okoh 《中国天文和天体物理学报》2011,(6)

A 30-m TeraHertz(THz) radio telescope is proposed to operate at 200 μm with an active primary surface.This paper presents sensitivity analysis of active surface panel positioning errors with optical performance in terms of the Strehl ratio.Based on Ruze's surface error theory and using a Monte Carlo simulation,the effects of six rigid panel positioning errors,such as piston,tip,tilt,radial,azimuthal and twist displacements,were directly derived.The optical performance of the telescope was then evaluated usi...  相似文献