GAME-TIBET青藏高原云和降水综合观测概况及初步结果   总被引：13，自引：7，他引：6  

刘黎平  楚荣忠  宋新民  周筠君  冯锦明  陈成品  张彤  S.Shimizu  K.Ueno  T.Koike  H.Fujii  H.Yamada  Y.Aoi  T.Ueno  J.Horikomi  M.Kajikawa  R Shirooka  J.Teshima 《高原气象》1999,18(3):441-450

对中日合作青藏高原能量水分循环试验项目中云和降水的多普勒雷达观测使用的气象观测仪器和获取的资料等情况进行了总结,并给出了那曲地区水的日变化,不同 雨量计测量降水的对比分析,风速对测量降水影响,多普勒雷达资料的个例分析及云的数值模拟的等初步结果。  相似文献   

Seasonal variations in coastal debris on Awaji Island, Japan   总被引：1，自引：1，他引：0  

Shimizu T  Nakai J  Nakajima K  Kozai N  Takahashi G  Matsumoto M  Kikui J 《Marine pollution bulletin》2008,57(1-5):182-186

The subject of our study was Awaji Island, an island located in the west of Japan that is surrounded by sea and that has serious problems relating to coastal debris. We conducted a long-term investigation focusing on three beaches and evaluated the results. The study was designed to develop an understanding of the actual situation, to inform local citizens, and raise their concerns about the problem of debris with a view to taking action against it. We obtained the following results: the amount, type, and ratio of debris changed according to weather and ocean conditions; debris also differs according to geographical conditions; social and economic activities of the surrounding area influence the type of debris encountered. Following this study, we have continued our investigation, and are continuing to gather data. At the same time, it is important to spread our ideas and enlighten people so as to encourage them not to dump debris. We hope that these actions manage to raise the level of consciousness among local citizens and to expand their anti-debris activities.  相似文献   

Numerical simulation of large wood deposition patterns and responses of bed morphology in a braided river using large wood dynamics model     

Taeun Kang  Ichiro Kimura  Yasuyuki Shimizu 《地球表面变化过程与地形》2020,45(4):962-977

This study discusses the reproducibility of a numerical model for simulating the morphodynamics involved in the transport of large pieces of wood in a braided river, considering the root wad effect and jam formation. The developed numerical model can simulate the behaviour of large pieces of wood using a two-dimensional depth-averaged Eulerian flow model that calculates the water flow and bed morphology. A Lagrange-type wood transport model is used herein, and the applicability of the combined model is discussed through a comparison with obtained experimental results. From the simulation results, we calculate the total braiding index and estimate the deposition patterns of wood pieces for comparison with the experimental results. We then analyse the bed morphology responses and wood deposition patterns in terms of the root wad effect and input supply. Moreover, we discuss the advantages and limitations of the proposed model to predict the large wood dynamics considering the bed morphology. © 2019 John Wiley & Sons, Ltd.  相似文献   

Subsurface hydrographic structures and the temporal variations of Aleutian eddies     

Rui Saito  Ichiro Yasuda  Kosei Komatsu  Hiromu Ishiyama  Hiromichi Ueno  Hiroji Onishi  Takeshi Setou  Manabu Shimizu 《Ocean Dynamics》2016,66(5):605-621

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Organic matters and acid‐sulfate alteration in Itomuka mercury mine,Hokkaido, Japan: Implications for the transportation and deposition mechanisms of Hg     

Takuya Echigo  Mitsuyoshi Kimata  Masahiro Shimizu 《Resource Geology》2020,70(2):204-213

In order to examine the transportation and deposition mechanisms of Hg, we investigated the ore and hydrothermal alteration minerals and solid organic matters from Itomuka mercury mine located in the eastern part of central Hokkaido. In addition to the ore minerals, native mercury and cinnabar, quartz, marcasite, alunite, kaolinite, and minor amounts of pyrite and smectite were identified in the Hg ore by powder X‐ray diffraction (XRD) analysis. This mineral assemblage of acid sulfate alteration was likely developed under the conditions of low temperature (≤100°C) and low pH (≤2) in the steam‐heated environment. The H₂SO₄ was produced above the water table by the oxidation of H₂S separated from deep, near‐neutral fluids by boiling. The dominance of native mercury over cinnabar in Hg ore indicates that the greater part of mineralized Hg was transported as Hg⁰ in aqueous solution and vapor with low sulfur fugacity. The solid organic matters found in the Hg ore were analyzed with SEM‐EDS, micro‐XRD, and micro‐Fourier transform infrared (FTIR) spectroscopy, and these results suggest that the organic matters contributed to keeping the low fO₂ of the Hg‐bearing fluid and transportation of Hg as Hg⁰ in S‐poor condition. Because the solubility of Hg in acidic fluid is low, neutral to alkaline fluid seems to have leached Hg from the basement sedimentary rocks of Hidaka Group which also supplied the organic matters to the fluid. The oxidation and cooling of Hg‐bearing solution and vapor triggered the deposition of liquid Hg as a primary phase.  相似文献   

Estimation of abundance and distribution of two moist tall grasses in the Watarase wetland,Japan, using hyperspectral imagery     

Shan Lu  Yo Shimizu  Jun Ishii  Syo Funakoshi  Izumi Washitani  Kenji Omasa 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(6):674-682

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Simultaneous MITSuME g'R_CI_C monitoring of S5 0716+714     

C. S. Stalin  Koji. S. Kawabata  Makoto Uemura  Michitoshi Yoshida  Nobuyuki Kawai  Kenshi Yanagisawa  Yasuhiro Shimizu  Daisuke Kuroda  Shogo Nagayama  Hiroyuki Toda 《Monthly notices of the Royal Astronomical Society》2009,399(3):1357-1366

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Evaluation of Mode I Fracture Toughness Assisted by the Numerical Determination of K-Resistance     

Takahiro Funatsu  Norikazu Shimizu  Mahinda Kuruppu  Kikuo Matsui 《Rock Mechanics and Rock Engineering》2015,48(1):143-157

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Development of a Precise Polarization Modulator for UV Spectropolarimetry     

S. Ishikawa  T. Shimizu  R. Kano  T. Bando  R. Ishikawa  G. Giono  S. Tsuneta  S. Nakayama  T. Tajima 《Solar physics》2015,290(10):3081-3088

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Imposex in Japanese gastropods (neogastropoda and mesogastropoda): Effects of tributyltin and triphenyltin from antifouling paints     

T. Horiguchi  H. Shiraishi  M. Shimizu  S. Yamazaki  M. Morita 《Marine pollution bulletin》1995,31(4-12):402-405

In Japan, marine pollution by organotin compounds is serious and imposex is known to occur in marine gastropods. However, a detailed survey on imposex had not previously been conducted. The first country-wide survey and laboratory experiments on imposex in Japanese gastropods has now been carried out, and the results are reported herein.  相似文献