Influence of sea level rise on Shanghai astronomical tide and storm surge and estimation of probable water level

reODUCTIONSthtrendanditsinfluencehaveattiactedInanresearchersinrecentyears.He(l994)exPloredthePOssibleeffectofSLRonZhuiang(Pear)fuverdeltaSSbyusingarelativelysimPletecboqUeofcollatingfutUreSthincrementswithrecenily-measuredtidalcharaCteristicvalues.Pengetal.(l994)usedasindlaraPProachtoinvestigatetheSthinf[uenceonTianinSS.SthhasqUitepronouncedimPatontheinteractionbetweenSSandATinshallowwater-SSandATgenesisaxegrealyinfluencedbylocalwaterdepthandtOpography-TocoPewiththenonlinearr…     

Brightness temperature for 166 radio sources

Using the database of the University of Michigan Radio Astronomy Observatory （UMRAO） at three radio frequencies （4.8, 8 and 14.5 GHz）, we determined the short-term variability timescales for 166 radio sources. The timescales are 0.15d （2007＋777） to 176.17 d （0528-250） with an average timescale of Atobs = 17.1 4- 16.5 d for the whole sample. The timescales are used to calculate the brightness temperatures, TB. The value of log TB is in the range of log TB = 10.47 to 19.06 K. In addition, we also estimated the boosting factor for the sources. The correlation between the polarization and the Doppler factor is also discussed.     

Wavelength calibration by combining arc and night sky lines for LAMOST

A novel method is presented for the wavelength calibration of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). The proposed method combines the arc lines and night sky lines, and can achieve high performance. Firstly, the initial wavelength calibration is performed by employing arc lines. Afterwards, the centroids of sky lines are calculated by the initial calibration results and adjusted by the gravity method iteratively. Finally, the ultimate wavelength calibration is obtained by fitting the centroids of arc lines and sky lines with their corresponding wavelengths. Experiments are performed on the data observed by LAMOST, and the results of the proposed method are more accurate than that of the calibration only by arc lines or sky lines. The calibration sky lines are dense in the red channel (5,700–9,000 Å) of LAMOST, but only a few ones are in the blue channel (3,700–5,900 Å). The new method achieves excellent results in the red channel as the substantial sky lines are employed, and the calibration accuracy of the blue channel is also enhanced in some degree by the scare sky lines.     

Metal enrichment via ram pressure stripping in the IGM of the compact galaxy group RGH 80

By creating and analyzing two dimensional gas temperature and abundance maps of the RGH 80 compact galaxy group with high-quality Chandra data,we detect a high-abundance (■0.7 Z⊙) arc,where the metal abundance is significantly higher than the surrounding regions by ■0.3Z⊙.This structure shows tight spatial correlations with the member galaxy PGC 046529,as well as with the arm-like feature identified on the X-ray image in the previous work of Randall et al.(2009).Since no apparent signature of AGN activity i...     

基于休憩行为的"东道主/游客"二元关系研究——以黄山市屯溪区为例

基于游客与居民休憩的态度和行为,以黄山市屯溪区为例,通过实地的问卷和访谈调查,对当地的游客与居民休憩行为进行了实证研究.在此基础之上,对当地的休憩行为做了"东道主/游客"二元关系的探讨,经比较研究发现:居民在主客交往中具有很强的主动性,交往的意愿非常强烈,而游客却略显被动,交往的意愿不太强烈,并且有所顾虑.     

近15年来中国古村镇旅游商业化研究进展

古村镇旅游商业化成为旅游学界研究的热点之一。运用文献资料法分析近15年来中国古村镇旅游商业化研究进展,按研究内容将已有研究主要归纳为古村镇旅游商业化的概念、特征、影响与评价、成因、对策和建议等几个方面,研究方法以描述性的定性研究为主,定量研究逐渐增多。在此基础上,提出未来中国古村镇旅游商业化研究趋势：完善概念等相关理论知识;扩宽研究视角;加强古村镇旅游商业化的定量测评,同时应与质性研究相结合;拓展案例地的研究范围;重视古村镇旅游商业化演化过程的研究等。     

A 16-ka lake-level record inferred from macrofossils in a sediment core from Genggahai Lake, northeastern Qinghai–Tibetan Plateau (China)

Genggahai Lake, a small, shallow water body on the northeastern Qinghai–Tibetan Plateau, is presently occupied by dense aquatic vegetation. The distribution of macrophytes is strongly associated with water depth. Macrofossils from a 7.82-m sediment core indicate that the dominant taxa in past aquatic plant communities were almost the same as those that dominate the lake today. In combination with sediment geochemical variables TOC, TN, and δ¹³C_bulk-org, macrofossil assemblages (aquatic plant remains, stem encrustations, and mollusc shells) were employed to reconstruct lake-level fluctuations over the past 16 ka. The lake formed or refilled at 15.3 cal ka and sustained a low level until 11.4 cal ka. From 11.4 to 6.3 cal ka, a remarkably high level was punctuated by a period of relatively low level between 9.2 and 7.4 cal ka. Stepwise drops in lake level occurred from 6.3 to 5.5 cal ka. Water level was characterized by more frequent fluctuations between 5.5 and 4.1 cal ka. Low level persisted from 4.1 to 2.1 cal ka and from 1.6 to 0.3 cal ka. Short-lived episodes of high water level were centered around 1.8 cal ka and since 0.3 cal ka. The lake-level history of Genggahai Lake appears to be largely consistent with the Asian monsoon records from nearby and distant locations. Our preliminary results suggest that monsoon variability on centennial to millennial timescales was superimposed on the long-term pattern of the Asian monsoon, modulated by orbitally induced summer insolation, and that the Asian monsoon may play an important role in water balance in marginal regions.     

Glacier meltwater runoff process analysis using δD and δ<Superscript>18</Superscript>O isotope and chemistry at the remote Laohugou glacier basin in western Qilian Mountains,China

Stable hydrogen and oxygen isotope has important implication on water and moisture transportation tracing research. Based on stable hydrogen (δD) and oxygen (δ¹⁸O) isotope using a Picarro L1102-i and water chemistry (e.g. major ions, pH, EC and TDS) measurement, this study discussed the temporal variation and characteristics of stable hydrogen and oxygen isotope, chemistry (e.g. TDS, pH, EC, Ca²⁺, Mg²⁺, Na⁺ and Cl^-) in various water bodies including glacier meltwater runoff, ice and snow, and precipitation at the Laohugou glacier basin during June 2012 to September 2013. Results showed that δD and δ¹⁸O in the meltwater runoff varied obviously with the temporal change from June to September, showing firstly increasing trend and then decreasing trend, with the highest values in July with high air temperature and strong glacier melting, which could indicate the temporal change of glacier melting process and extent. Variations of δD and δ¹⁸O in the runoff were similar with that of snow and ice on the glacier, and the values were also above the GMWL, which probably implied that the glacier runoff was mainly originated from glacier melting and precipitation supply. The glacier meltwater chemical type at the Laohugou glacier basin were mainly composed by Ca-Na-HCO₃-SO₄ and Ca-Mg-HCO₃-SO₄, which also varied evidently with the glacier melting process in summer. By analyzing the temporal change of stable hydrogen and oxygen isotope and chemistry in the melting period, we find it is easy to separate the components of the snow and ice, atmospheric precipitation and melt-runoff in the river, which could reflect the change process of glacier melting during the melting period, and thus this work can contribute to the glacier runoff change study of large-scale region by stable isotope and geochemical method in future.     

基于数学形态学的测试卡图案识别方法

提出了一种基于数学形态学的双向匹配识别方法,通过对测试运动员的测试卡图案进行识别,试验结果表明该方法不仅能良好地去除测试卡图案上噪声的影响,而且能有效识别测试卡上图案,识别正确率高达95%以上。     

尼泊尔Ms 8.1级地震活动构造及次生地质灾害研究

2015年尼泊尔Mw 7.8大地震诱发了大量的山体滑坡,对尼泊尔境内与周边地区造成了严重的影响。选取离震中较近的辛杜帕尔乔克地区作为研究区,基于L波段ALOS-2和C波段Sentinel-1A两种合成孔径雷达数据,采用堆叠合成孔径雷达干涉测量（interferometric synthetic aperture radar,InSAR）技术开展震后滑坡的探测与识别,结合光学影像圈定出滑坡隐患点14处。在此基础上,联合升降轨数据和多维小基线集（multidimensional small baseline subset,MSBAS)-InSAR技术获取了典型滑坡的二维时间序列形变特征,结果表明,该典型滑坡的主要形变发生在水平东西向,最大形变速率为-69 mm/a。同时,通过对该典型滑坡时间序列中的趋势项与周期项形变信号进行分析,发现地震对于滑坡运动具有明显的加速作用,且降雨量的增加使得滑坡位移在每年的8月-11月呈现出周期性变化,可为震后滑坡监测研究提供参考。