Experiments of DSAEF_LTP Model with Two Improved Parameters for Accumulated Precipitation of Landfalling Tropical Cyclones over Southeast China     

秦思  贾莉  丁晨晨  任福民  约翰·L·麦克布莱  李国平 《热带气象学报(英文版)》2022,28(3):286-296

The Dynamical-Statistical-Analog Ensemble Forecast model for landfalling tropical cyclones (TCs) precipitation (DSAEF_LTP) utilises an operational numerical weather prediction (NWP) model for the forecast track, while the precipitation forecast is obtained by finding analog cyclones, and making a precipitation forecast from an ensemble of the analogs. This study addresses TCs that occurred from 2004 to 2019 in Southeast China with 47 TCs as training samples and 18 TCs for independent forecast experiments. Experiments use four model versions. The control experiment DSAEF_LTP_1 includes three factors including TC track, landfall season, and TC intensity to determine analogs. Versions DSAEF_LTP_2, DSAEF_LTP_3, and DSAEF_LTP_4 respectively integrate improved similarity region, improved ensemble method, and improvements in both parameters. Results show that the DSAEF_LTP model with new values of similarity region and ensemble method (DSAEF_LTP_4) performs best in the simulation experiment, while the DSAEF_LTP model with new values only of ensemble method (DSAEF_LTP_3) performs best in the forecast experiment. The reason for the difference between simulation (training sample) and forecast (independent sample) may be that the proportion of TC with typical tracks (southeast to northwest movement or landfall over Southeast China) has changed significantly between samples. Forecast performance is compared with that of three global dynamical models (ECMWF, GRAPES, and GFS) and a regional dynamical model (SMS-WARMS). The DSAEF_LTP model performs better than the dynamical models and tends to produce more false alarms in accumulated forecast precipitation above 250 mm and 100 mm. Compared with TCs without heavy precipitation or typical tracks, TCs with these characteristics are better forecasted by the DSAEF_LTP model.  相似文献   

ArcGIS三维分析技术在潜在滑坡体预测中的应用     

李思发  李亮  闵艳艳  龚梅 《贵州地质》2011,28(2):158-160,157

以贵州省六盘水市水城县大河镇一个潜在滑坡体为例,利用遥感影像（RS）、地理信息系统（GIS）、遥感图像处理（ENVI）和三维分析（ArcGIS）等技术,完成了对该地质体的高分辨率遥感影像和DEM信息数据的生成处理。并采用ArcGIS三维分析方法技术,实现了对所预测的潜在滑坡体三维的立体可视化成图及其表面积、体积的概略计...  相似文献   

泌阳凹陷毕店地区油藏特征浅析     

朱颜  张伊琳  黄生娣  郑融  李恒权  柯思 《四川地质学报》2011,(4):417-419

泌阳凹陷毕店地区经过三十多年的勘探,一直没有取得实质性的突破。2005年以来对该区三维地震资料重新处理与解释攻关,基本具备了精细勘探的物质基础。毕店地区主体已发现的油气藏类型以断层+岩性油气藏为主。通过应用系统的研究思路,以现代石油地质理论为指导,初步探讨毕店地区油藏分布特征与油气成藏的控制作用。  相似文献   

三峡库区消落区表层沉积物磷吸附特征   总被引：2，自引：0，他引：2       下载免费PDF全文

曹琳  吉芳英  林茂  黎司  王图锦 《水科学进展》2011,22(1):89-96

以三峡库区消落区表层沉积物为研究对象,通过对干湿交替沉积物中磷的赋存形式、吸附等温曲线的分析,揭示了干湿交替过程中沉积物磷的分布规律、吸附特征以及磷的源汇变化。结果表明:上覆水总磷变化呈现11月总磷<5月总磷<8月总磷。消落区覆水到出露沉积物最大磷吸附量、土壤最大缓冲能力在增加,磷零吸持平衡浓度、易解吸磷在降低,表明沉积物在夏季出露落干的过程中,固磷能力增强,释磷能力减弱;消落区土壤首次覆水过程中土壤磷呈现出由源到汇的转变。成库初期,覆水时沉积物主要表现为磷的积累,次年水库开闸放水排沙时,消落区表层富磷沉积物被冲刷排出。  相似文献   

Molecular identification of a species in genus Nannochloropsis     

Si Li  Kehou Pan  Baohua Zhu  Xiaolei Ma  Xin Liang  Guanpin Yang 《中国海洋大学学报(英文版)》2011,10(4):391-396

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原子吸收分光光度法快速测定红土镍矿中镍   总被引：1，自引：0，他引：1       下载免费PDF全文

司银奎  申世伟 《山东国土资源》2011,27(10):47-48,51

试样经烘干处理后,利用酸溶法或碱融法制备稳定的分析溶液,然后利用原子吸收分光光度计于波长232.0nm处,随同标准曲线测量镍含量,此方法简单、快捷,所选分析线干扰小、灵敏度高,稳定性和准确度均满足要求。  相似文献   

The changes of vegetation cover in Ejina Oasis based on water resources redistribution in Heihe River   总被引：1，自引：0，他引：1  

Wang Yaobin  Feng Qi  Si Jianhua  Su Yonghong  Chang Zongqiang  Xi Haiyang 《Environmental Earth Sciences》2011,64(7):1965-1973

The Ejina Oasis (EO), located in arid northwest China, is a typical arid area in the world. The ecosystem in the oasis has become worse since the 1990s. However, it began to improve after the Chinese government took the mandatory measure to redistribute the water in Heihe in 2000. To understand this change, the remote sensing images in 1990, 2000 and 2006 were selected, and exertion related Land Use/Cover Change (LUCC) model was employed. Results showed that: (1) non-vegetation cover was the main body of the vegetation cover in oasis, showing a trend of increase at the beginning and diminution later, while low, medium and high vegetation cover was the other way around; (2) the area of low, medium and high vegetation cover in 2006 was less than that in 1990; the status and trend index P _t of oasis vegetation cover was 0.62 in 1990–2000, which means that the oasis ecosystem of Ejina was getting worse and was under an unbalanced status; P _t was 0.27 in 2000–2006 indicating that the oasis ecosystem was restored obviously and the whole system tended to be balanced; (3) all of these changes should be attributed to the water resources redistribution in Heihe River, which played a leading role, as well as the measures and relevant policies taken by the local government, which promoted the rapid recovery of the medium and high vegetation.  相似文献   

Zircon U–Pb Dating and Geochemistry of the Linong Granitoid and Its Relationship to Cu Mineralization in the Yangla Copper Deposit,Yunnan, China     

Xi‐An Yang  Jia‐Jun Liu  Da‐Peng Li  De‐Gao Zhai  Long‐Bo Yang  Si‐Yu Han  Huan Wang 《Resource Geology》2013,63(2):224-238

The Yangla copper deposit (Cu reserves: 1.2 Mt) in the Jinshajiang–Lancangjiang–Nujiang region in China is spatially associated with the Linong granitoid. Zircon U–Pb dating shows the granitoid formed at 234.1 ± 1.2 to 235.6 ± 1.2 Ma, and the KT2 ore body of the deposit yields a molybdenite Re–Os model age of 230.9 ± 3.2 Ma. The ages of mineralization and crystallization of the granitoid are identical within the measurement uncertainties, suggesting the Yangla deposit is genitically related to the Indosinian Linong granitoid.  相似文献   

An Ecological Compensation Mechanism based on the Green Productive Area of Cities     

YANG Yuanchuan  ZHANG Yukun  ZHENG Jie  HUANG Si  ZHAO Man  HONG Long 《资源与生态学报(英文版)》2022,13(3):382-393

China's urban expansion, food security, and energy transition are in a critical situation. One solution is to tap into the green production potential of the built urban environment and explore new ways to save land space and alleviate ecological pressure through food and solar energy production. This paper differs from previous ecological compensation studies, which mostly focus on key ecological functional areas or fiscal compensation mechanisms, in that it innovatively establishes an ecological compensation mechanism within the urban space. In this paper, we propose the "green productive area" of cities as a way to measure the ecological carrying capacity improvement potential of cities from the perspective of urban ecology, and it is based on converting the green resource income of cities into the ecological footprint area they could save under the same conditions. First, a typological approach was used to establish a compensation strategy for green production. Second, a spatial inventory was taken of all elements of the built environment and an analysis of their green production potential was carried out. Finally, it was necessary to establish a unified accounting standard for the ecological land saving benefits of different green production options, which could be converted into green productive land area indicators. In the case of Xuefu Street in Nankai District, Tianjin, the available rooftops and idle land were used for green production, which supplemented the ecological carrying capacity provided by the natural land occupied by 12% of the buildings in the district.  相似文献   

Digital Analysis of the Water Layout Ecological Wisdom in Traditional Chinese Rural Settlements: A Case Study of Liukeng Village in Jiangxi Province     

LI Zhe  HUANG Si  WANG Han  LI Yan 《资源与生态学报(英文版)》2022,13(3):371-381

During the long-term construction and development process of eliminating water disasters and promoting water conservancy in traditional settlements, a set of mature strategies that have simple ecological wisdom in water layout have been formed by adapting to the natural water environment and utilizing the regional water system. This study conducted a qualitative and quantitative analysis of the water layout strategies and their effects on Liukeng Village from three aspects: deciphering the water systematic pattern, calculating the spatial characteristics and quantifying the water environment, to explore the technical assistance and potential of water layout research in traditional rural settlements. The results indicated that Liukeng has an unambiguously systematic water layout pattern of source diversion, middle drainage and end purification of the water. Through 3D point cloud computing, it was shown that the site selection made accurate use of micro-topography and adopted the strategy of a multi-source water management. It formed an organic water system pattern, which provided sufficient water sources for all kinds of needs of Liukeng Village.The Dragon Lake in Liukeng held 83.0% of the precipitation, and the vegetation area accounted for 34.7% of the total area of Liukeng, which had high surface permeability and good middle drainage effects. Water detection showed that the Dragon Lake provided good water quality and purification. The purposes of this study are to fill the gap in previous non-quantitative research on water layout in traditional rural settlements, excavate the hidden information and value of settlements, and deepen our understanding of the ecological wisdom of the overall planning, layout and construction of water conservancy in traditional rural settlements. This knowledge can assist the win-win situation of water conservancy cultural heritage protection and modern utilization. It also provides useful inspiration and reference for properly dealing with the problems of rain and flooding, realizing the sustainability of water resources, and protecting the ecological environment in the process of the development and construction of village settlements in China.  相似文献