Dynamics of local extreme rainfall of super Typhoon Soudelor (2015) in East China     

Jinsong Pan  Daigao Teng  Fuqing Zhang  Lingli Zhou  Ling Luo  Yonghui Weng  Yunji Zhang 《中国科学:地球科学(英文版)》2018,61(5):572-594

The characteristics and dynamics associated with the distribution, intensity, and triggering factors of local severe precipitation in Zhejiang Province induced by Super Typhoon Soudelor (2015) were investigated using mesoscale surface observations, radar reflectivity, satellite nephograms, and the final (FNL) analyses of the Global Forecasting System (GFS) of the National Center for Environmental Prediction (NCEP). The rainfall processes during Soudelor’s landfall and translation over East China could be separated into four stages based on rainfall characteristics such as distribution, intensity, and corresponding dynamics. The relatively less precipitation in the first stage resulted from interaction between the easterly wind to the north flank of this tropical cyclone (TC) and the coastal topography along the southeast of Zhejiang Province, China. With landfall of the TC in East China during the second stage, precipitation maxima occurred because of interaction between the TC’s principal rainbands and the local topography from northeastern Fujian Province to southwestern Zhejiang Province. The distribution of precipitation presented significant asymmetric features in the third stage with maximal rainfall bands in the northeast quadrant of the TC when Soudelor’s track turned from westward to northward as the TC decayed rapidly. Finally, during the northward to northeastward translation of the TC in the fourth stage, the interaction between a mid-latitude weather system and the northern part of the TC resulted in transfer of the maximum rainfall from the north of Zhejiang Province to the north of Jiangsu Province, which represented the end of rainfall in Zhejiang Province. Further quantitative calculations of the rainfall rate induced by the interaction between local topography and TC circulation (defined as “orographic effects”) in the context of a one-dimensional simplified model showed that orographic effects were the primary factor determining the intensity of precipitation in this case, and accounted for over 50% of the total precipitation. The asymmetric distribution of the TC’s rainbands was closely related to the asymmetric distribution of moisture resulted from changes of the TC’s structure, and led to asymmetric distribution of local intense precipitation induced by Soudelor. Based on analysis of this TC, it could be concluded that local severe rainfall in the coastal regions of East China is closely related to changes of TC structure and intensity, as well as the outer rainbands. In addition, precipitation intensity and duration will increase correspondingly because of the complex interactions between the TC and local topography, and the particular TC track along large-scale steering flow. The results of this study may be useful for the understanding, prediction, and warning of disasters induced by local extreme rainfall caused by TCs, especially for facilitating forecasting and warning of flooding and mudslides associated with torrential rain caused by interactions between landfalling TCs and coastal topography.  相似文献   

焦作地区碳酸盐岩裂隙发育特征及其水文地质意义     

梁彬  翁金桃  陶友良  童长水 《中国岩溶》1990,9(1):25-33

作者对焦作地区的构造裂隙进行了大量的测量和统计分析,总结了不同层位和不同类型碳酸盐岩裂隙发育特征。针对不同性质构造的裂隙研究表明,裂隙发育特征对确定某些构造控水的水文地质边界具有一定意义。   相似文献   

桂林唐家湾生物礁的发现及其意义   总被引：1，自引：1，他引：0  

翁金桃  罗贵荣 《中国岩溶》1983,2(1):1-10

<正> 一、发现经过 在桂林南郊唐家湾公路以北约300米处(图1),有一个碳酸盐岩体,其两侧岩层产状相反,上面被一水平岩层复盖(图2,图版Ⅰ—1)。过去都认为其下部为一个小型背斜构造,其上部的水平岩层是逆掩断层造成的。 1980年底,作者在该岩体中发现了大量的造礁生物。经过仔细观察和研究,认为该地碳酸盐岩的特殊形态并不是地质构造现象,而是一个生物礁灰岩的岩隆。   相似文献   

单晶固体中正电子波函数的计算     

熊涛  张杰  陈祥磊  叶邦角  杜淮江  翁惠民 《海洋学报》2010,32(10):7374-7377

介绍了正电子波函数计算的两种基本方法——有限差分方法(FDM)与平面波方法(PW).并以单晶Si为例,计算出正电子的波函数,从而计算出正电子在Si中的密度分布;由该正电子密度,进一步计算出了正电子在Si中的体寿命.计算结果与我们最近的实验结果(220 ps)符合得很好.最后,探讨了这两种方法各自的优缺点.  相似文献   

Pulse phase-resolved analysis of SMC X-3 during its 2016–2017 super-Eddington outburst     

Hai-Hui Zhao  Shan-Shan Weng  Ming-Yu Ge  Wei-Hao Bian  Qi-Rong Yuan 《Astrophysics and Space Science》2018,363(2):21

The Be X-ray pulsar SMC X-3 underwent an extra long and ultraluminous giant outburst from 2016 August to 2017 March. The peak X-ray luminosity is up to \(\sim10^{39}~\mbox{erg/s}\), suggesting a mildly super-Eddington accretion onto the strongly magnetized neutron star. It therefore bridges the gap between the Galactic Be/X-ray binaries (\(L_{\mathrm{X}}^{\mathrm{peak}} \leq10^{38}~\mbox{erg/s}\)) and the ultraluminous X-ray pulsars (\(L_{\mathrm{X}}^{\mathrm{peak}} \geq10^{40}~\mbox{erg/s}\)) found in nearby galaxies. A number of observations were carried out to observe the outburst. In this paper, we perform a comprehensive phase-resolved analysis on the high quality data obtained with the Nustar and XMM-Newton, which were observed at a high and intermediate luminosity levels. In order to get a better understanding on the evolution of the whole extreme burst, we take the Swift results at the low luminosity state into account as well. At the early stage of outburst, the source shows a double-peak pulse profile, the second main peak approaches the first one and merges into the single peak at the low luminosity. The second main peak vanishes beyond 20 keV, and its radiation becomes much softer than that of the first main peak. The line widths of fluorescent iron line vary dramatically with phases, indicating a complicated geometry of accretion flows. In contrast to the case at low luminosity, the pulse fraction increases with the photon energy. The significant small pulse fraction detected below 1 keV can be interpreted as the existence of an additional thermal component located at far away from the central neutron star.  相似文献   

A three-point method for estimating wave reflection of obliquely incident waves over a sloping bottom     

Swun-Kwang Wang  Tai-Wen Hsu  Wen-Kai Weng  Shan-Hwei Ou 《Coastal Engineering》2008

A three-point method for estimating wave reflection is proposed to account for monochromatic oblique incident waves propagating over a sloping beach. The amplitudes of reflected wave and incident wave are separated using wave amplitudes measured at three fixed wave gauges with a distance. The applicability of the theory is verified by comparing the simulated results with the available theoretical, numerical and experimental results for the estimation of wave reflection. The sensitivity is also tested to provide a more accurate prediction of the reflection coefficient.  相似文献   

台湾海峡中、北部海域春、夏季水团分析   总被引：13，自引：2，他引：13  

翁学传  张启龙  颜廷壮  王从敏  梁红星 《海洋与湖沼》1992,23(3):235-244

本文依据1983,1984,1987,1988几年的有关资料,利用“对应分析法”对台湾海峡中、北部海域春、夏季(5—8月)的水团及有关问题进行了分析。结果表明:(1)5—8月间该海域存在两种水团分布类型,其中5月属冬季型,全海域存在浙闽沿岸水和海峡暖流水两个水团;6—8月属夏季型,全海域均为海峡暖流水盘踞,按温度不同,它又分为上层水和深层水两部分。(2)浙闽沿岸水具低温、低盐、高溶解氧特征,均一性较差,年际变异较大;海峡暖流水以高盐为主要特征,温、盐度和溶解氧分布较均匀,且诸特征相对稳定。(3)海峡东、西两侧均存在上升流现象,西侧的上升流出现于6—8月,中心在海潭岛附近;东侧的上升流7月见于澎湖群岛北方海区。(4)6—8月间,海峡暖流深层水(核心)主要沿海峡偏西一侧北上,而不是紧靠东侧径直向北。  相似文献   

皖南西递黟县青工艺石材矿地质特征及成因     

翁望飞  罗家元  张帆 《江苏地质》2023,47(3):259-270

“黟县青”是皖南黟县西递特有的一种地方性工艺建筑石材矿，含矿地层为形成于浅海陆架相环境的寒武系大陈岭组，主要产于蓝田向斜盆地内，为受沉积成因控制的大理岩化灰岩矿床，矿体严格受地层产状控制。黟县青石材矿赋矿岩层为深灰色巨厚层纹层状大理岩化微细—细中晶灰岩，因具有高密度、抗风化、抗冻、耐碱、耐水、刚度大于普通灰石、抗变形能力大于混凝土等特性而被广泛应用于徽州地区明清古建筑。燕山期黟县花岗闪长岩体的侵入使灰岩发生大理岩化，对矿石品质的提升起着积极的作用。在矿产勘查的基础上，通过对西递水口亭地区黟县青石材矿成矿地质条件、矿体（矿石）特征和矿床成因的研究，为皖南地区该矿种的勘查、研究和开发利用提供重要的基础资料。  相似文献   

丘陵山区地表温度场日间变化的简单推算          下载免费PDF全文

李慧  翁笃鸣 《气象》1993,19(1):14-17

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