检索结果-南通市图书馆

Validation of three infiltration models on purple soil under simulated rainfall

Progress in Natural Science:Materials International 2007年第9期17卷 1059-1066页

作者： wang yukuan1,2.fu bin1,3.xu pei1,2.wang daojie1,2.wang xiantuo1,3.and wang yongqiang1,3.1.key laboratory of mountain surface process and hazards,chinese academy of seiences,chengdu 610041,china 2.Institute of mountain hazards and Environment,chinese academy of Sciences,chengdu 610041,china 3.Graduate University of the chinese academy of Sciences,Beijing 100049,china) key laboratory of mountain surface process and hazards Chinese Academy of Seiences Chengdu 610041 China Institute of mountain hazards and Environment， chinese academy of Sciences， chengdu 610041 China Graduate University of the chinese academy of Sciences Beijing 100049 China

So as to find models suitable for the prediction of water infiltration in purple soil,infiltration rates simulated by three popular empirical infiltration models,Horton model,Kostiakov model,and the modified Kostiakov model,were compared by using those observed results on slope in purple soil under rainfall simulation.28 sets of infiltration data were divided into two parts for parameter estimation and validation *** performance of the three infiltration models was evaluated with the Nash and Sutcliffe efficiency *** results show that the percent for Nash and Sutcliffe efficiency greater than 0.7 is about 69.7% for the Horton model,and 48.48%,and 54.55% for the Kostiakov model and the modified Kostiakov model,*** model is better than Kostiakov model and the modified Kostiakov model in most rain events in the ***,Kostiakov model is still suitable for reasonable prediction of the infiltration in purple soil sloping farmland because fewer parameters are ***,rainfall intensity has significant effects on the parameter values used in the simulation *** simulation results can be improved by choosing suitable parameters according to the rainfall intensity.

关键词： infiltration model sloping farmland purple soil rainfall simulation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Changes in overland flow and sediment during simulated rainfall events on cropland in hilly areas of the Sichuan Basin,china

引用

Progress in Natural Science:Materials International 2009年第11期19卷 1613-1618页

作者： bin fu,yukuan wang~*,pei xu,daojie wang key laboratory of mountain hazards and Earth surface process,Institute of mountain hazards and Environment, The chinese academy of Sciences,chengdu 610041,china [a]key laboratory of mountain hazards and Earth surface process Institute of Mountain Hazards and Environment The Chinese Academy of Sciences Chengdu 610041 China

Water and soil loss are the major causes of the land degradation in the hilly area of the Sichuan Basin,china,where purple soil(FAO, Calcaric Regosols) is widely *** research has been conducted on changes in overland flow and sediment during rain events on sloping cropland in this *** this study,45 artificial rainfall events were applied to five runoff plots with slopes of 9%,18%,27%, 36%,and 47%,*** showed that erosion processes on purple soil of sloping cropland are complex,because the sediment concentration changes with time under different *** to correlations between runoff discharge and sediment concentration, all erosion events were classified into three types:(1) positive correlation;(2) negative correlation;and(3) no *** correlations were dominant,accounting for 60%of all *** intensity,slope gradient,and tillage treatment were the main factors that influenced erosion events.

关键词： Discharge-sediment concentration relationships Water erosion Artificial rainfall Hilly area of the Sichuan Basin Purple soil

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Assessment of the Performance of WEPP in Purple Soil Area with Simulated Rainfall Experiments

引用

Journal of mountain Science 2012年第4期9卷 570-579页

作者： fu bin wang yukuan xu pei YAN Kun key laboratory of mountain hazards and Earth surface process ChineseAcademy of SciencesChengdu 610041China Institute of mountain hazards and Environment Chinese Academy of SciencesChengdu 610041China

The water erosion prediction project （WEPP） model is a popular water erosion prediction tool developed on the basis of the physical processes of water erosion. Although WEPP has been widely used around the world, its application in china is still insufficient. In this study, the performance of WEPP used to estimate the runoff and soil loss on purple soil （Calcaric Regosols in FAO taxonomy） sloping cropland was assessed with the data from runoff plots under simulated rainfall conditions. Based on measured soil properties, runoff and erosion parameters, namely effective hydraulic conductivity, inter-rill erodibility, rill erodibility, and critical shear stress were determined to be 2.68 mm h-1, 5.54 x l0^6 kg s-1 m-4, 0.027 s m-1 and 3-5 Pa, respectively, by using the recommended equations in the WEPP user manual. The simulated results were not good due to the low Nash efficiency of 0.41 for runoff and negative Nash efficiency for soil loss. After the four parameters were calibrated, WEPP performed better for soil loss prediction with a Nash efficiency of 0.76. The different results indicated that the equations recommended by WEPP to calculate parameters such as erodiblity and critical shear stress are not suitable for the purple soil areas, Sichuan Province, china. Although the predicted results can be accepted by optimizing the runoff and erosion parameters, more research related to the determination of erodibility and critical sheer stress must be conducted to improve the application of WEPP in the purple soil areas.

关键词： WEPP Soil erosion Simulated rainfall Purple soil Erodibility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Soil Conservation Assessment in the Upper Yangtze River Basin Based on InVEST Model

Soil Conservation Assessment in the Upper Yangtze River Basi...

引用

2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： REN Jing key laboratory of mountain hazards and Earth surface process, CAS, chengdu, Sichuan 610041, china Institute of mountain hazards and Environment, CAS Graduate University of CAS, Beijing 100049, china.wang yukuan, fu bin, xu pei key laboratory of mountain hazards and Earth surface process, CAS, chengdu, Sichuan 610041, china Institute of mountain hazards and Environment, CAS chengdu, Sichuan 610041, china

Studying and revealing the spatial distribution of soil loss will play an important role in water and soil conservation planning. In this study, the Geographic Information System （GIS） technology and the Integrated Valuation of Ecosystem Services and Tradeoffs Tool （InVEST） model were applied to estimate the amount of soil loss and assess the soil conservation capacity by the main ecological system in the Upper Yangtze River Basin （UYRB）. The results show: （1） the annual potential soil erosion is 92.92×10 8 t year -1 . The area of average annual soil loss bellow 500 km -2 year -1 occupies 35.08% and above 5000 km -2 year-1 occupies 36.8%. （2）The annual actual soil erosion is 12.30×10 8 t year -1 . Slight and moderate soil loss is in majority, about 68.15% of the watershed area is found out to be under moderate degree. （3）The annual soil conservation is 80.61×10 8 t year -1 , and the contributing percent of main individual ecosystems was as follows: the forest occupies 46.11%, grassland 24.21%. Forest ecosystem does best in soil conservation.

关键词： The Upper Yangtze River Basin (UYRB) USLE GIS Soil erosion Soil Conservation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Study on rain-runoff process in the peripheral mountainous area of the Sichuan Basin

引用

chinese Journal Of Geochemistry 2008年第2期27卷 183-188页

作者： fu bin wang Yu-kuan REN Yi LIU Cheng xu pei key laboratory of mountain surface process and hazards Chinese Academy of Sciences Chengdu 610041 China Institute of mountain hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of the chinese academy of Sciences Beijing 100049 China

Studies on rain-runoff process in the peripheral mountainous area of the Sichuan Basin, which is regarded as a key ecological shelter, will contribute to flood control and environmental protection for the Upper Yang-tze River Basin. In two typical catchments-the fujiang River Catchment and the Wujiang River Catchment, rainfall simulations have been conducted to study the rain-runoff processes of yellow soil and limestone soil in three types of land use-forestland, farmland and grassland. Results showed that (1) within the same rainfall process, overland flow occurs first on farmland, then on grassland, and finally on forestland; (2) soil surface coverage has a great impact on the occurrence and amount of overland flow. The runoff amount can increase 2-4 times after the coverage is removed;(3) the infiltration before the occurrence of overland flow will decrease because of higher gravel contents of soil, but it takes no effect on infiltration once overland flow becomes stable; (4) the runoff coefficient of the limestone soil forestland is greater than that of the yellow soil forest land, but less than that of the farmland; (5) three empirical infiltration models, including Horton' model, Kostiakov' model, and modified Kostiakov' model, were compared by using the observed results under rainfall simulation. The results showed that the Kostiakov' model performed better than both the Horton' model and modified Kostiakov model. According to the results of this research, the Kostiakov's model can be used to simulate rainfall infiltration when water erosion is modeled in the peripheral mountainous area of the Sichuan Basin.

关键词：山地四川盆地降雨量河流

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

四川山区农村面源污染负荷估算与评价

引用

农业工程学报 2016年第24期32卷 218-225,F0004页

作者：刘菊傅斌王玉宽徐佩中国科学院水利部成都山地灾害与环境研究所成都610041 中国科学院大学北京100049 万州典型区生态环境监测重点站重庆404020

对农村面源污染物负荷的估算、来源分析及控制措施制定是当前研究的热点之一。利用输出系数模型和生态系统服务与权衡综合评价模型(Integrate valuation of ecosystem services and tradeoffs tool,InVEST模型)估算宝兴县面源污染物总氮... 详细信息

对农村面源污染物负荷的估算、来源分析及控制措施制定是当前研究的热点之一。利用输出系数模型和生态系统服务与权衡综合评价模型(Integrate valuation of ecosystem services and tradeoffs tool,InVEST模型)估算宝兴县面源污染物总氮(TN)、总磷(TP)负荷,并结合水环境功能分区标准,分析面源污染物的超标情况。旨在揭示山区农村面源污染治理的空间异质性,为农村面源污染防治规划、山区水环境治理效率的提升提供科学依据。结果表明,1)2010年宝兴县面源污染物TN、TP负荷分别为1156.44、81.41t/a,TN、TP负荷的空间格局整体上呈现出分布不均,局部集中,靠近水体的规律;2)不同污染源对TN、TP负荷的贡献率大小顺序均为:畜禽养殖>农业用地>农村生活;3)从流域尺度看,宝兴县TN、TP负荷没有超过III类水质标准规定的污染物负荷阈值;而从30m×30m栅格尺度看,宝兴县TN、TP超标量分别为763.63、51.16t/a,其超标区域主要集中在耕地、草地、居民地以及靠近水体的地方,以上超标区域即为面源污染控制和治理的关键区域。

关键词：农业污染模型水环境功能分区产水量空间差异

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

岷江源区Hargreaves法适用性与未来参考作物蒸散量预测

引用

农业机械学报 2018年第4期49卷 273-281页

作者：严坤王玉宽徐佩傅斌李春中国科学院水利部成都山地灾害与环境研究所成都610041 中国科学院大学北京100049 中国电建集团成都勘测设计研究院有限公司成都610072

利用岷江源区1961—2010年逐日气象数据,采用FAO 56 Penman-Monteith和Hargreaves公式计算参考作物蒸散量,并以FAO 56 Penman-Monteith为标准对Hargreaves公式适用性进行评价,通过对Hargreaves公式转换系数C0进行修正,建立基于月尺度的... 详细信息

利用岷江源区1961—2010年逐日气象数据,采用FAO 56 Penman-Monteith和Hargreaves公式计算参考作物蒸散量,并以FAO 56 Penman-Monteith为标准对Hargreaves公式适用性进行评价,通过对Hargreaves公式转换系数C0进行修正,建立基于月尺度的参考作物蒸散发公式,结合Reg CM4.0区域模型生成的温度数据,对未来(2011—2099年)研究区参考作物蒸散发量变化进行预测。研究结果表明:通过通径分析发现,在岷江源区气温是影响参考作物蒸散量最重要的气象因子,采用基于温度法的参考作物蒸散发公式具有理论依据;采用未修正的Hargreaves公式明显高估了该区域参考作物蒸散量,特别是在雨季4—10月;修正后的Hargreaves公式绝对偏差与相对偏差显著减小,与FAO 56 Penman-Monteith月值之间均方根误差RMSE为3.76 mm、效率指数EF为0.39、可决系数CD为0.84,吻合系数d为0.8,能够满足研究区参考作物蒸散发估算精度;在未来气候变化情景下岷江源区参考作物蒸散量总体呈增加趋势,气候倾向率为5.6 mm/(10 a)。

关键词：参考作物蒸散量岷江源区 FAO 56 Penman-Monteith Hargreaves 适用性评价气候变化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

坡耕地边沟水土保持机制模拟研究

引用

中国水土保持科学 2019年第4期17卷 41-48页

作者：蔡雄飞雷丽梁萍傅斌王济徐佩王玉宽贵州师范大学地理与环境科学学院贵阳550001 中国科学院水利部成都山地灾害与环境研究所成都610041 万州典型区生态环境监测重点站重庆404020

坡耕地边沟(简称地边沟)——我国南方丘陵区坡面水系工程措施体系的重要措施之一,在坡耕地的保护与治理中发挥了重要的作用。为了探讨地边沟的水土保持机制,选取了典型紫色土分布区盐亭、遂宁的4个野外试验点,通过野外调查、大田人工模... 详细信息

坡耕地边沟(简称地边沟)——我国南方丘陵区坡面水系工程措施体系的重要措施之一,在坡耕地的保护与治理中发挥了重要的作用。为了探讨地边沟的水土保持机制,选取了典型紫色土分布区盐亭、遂宁的4个野外试验点,通过野外调查、大田人工模拟降雨试验等方法,开展了11场模拟试验。结果表明:1)地边沟具有很好的减流作用,减流率在14.08%~36.72%之间,平均24.7%;随着降雨强度的增大,减流率减小,耕地土壤厚度是影响地边沟减流效果的主要因素。2)地边沟具有很好的减沙作用,减沙率在31.93%~64.95%之间,平均50.08%,随着降雨强度的增大,减沙率增大。3)由于地边沟对泥沙的沉积作用,B小区(试验小区)输移泥沙中黏粒和细粉粒率比A小区(对比试验小区)平均增加12.85%,而粗粉粒及以上颗粒比A小区平均减少40.21%。地边沟减沙作用随降雨强度的增大而更加显著,比较适合于我国南方降水丰富的丘陵地区。

关键词：坡地边沟水土保持机制坡耕地

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

成都市景观格局时空变化及驱动因素分析

引用

人民长江 2018年第9期49卷 11-18页

作者：肖况王玉宽吴光傅斌王秋伟中国科学院成都山地灾害与环境研究所四川成都610041 西南交通大学地球科学与环境工程学院四川成都611756 成都市环境监测中心站四川成都610011

快速城镇化深刻影响着城市热岛效应、大气环境、生态质量等诸多方面,是目前城市生态学和景观地理学研究的热点。采用中高分辨率遥感影像,利用Fragstats软件计算景观指数,分别从全市域和中心城区两个尺度研究了2000~2010年成都市景观格... 详细信息

快速城镇化深刻影响着城市热岛效应、大气环境、生态质量等诸多方面,是目前城市生态学和景观地理学研究的热点。采用中高分辨率遥感影像,利用Fragstats软件计算景观指数,分别从全市域和中心城区两个尺度研究了2000~2010年成都市景观格局时空变化特征,并对中心城区扩张导致的新旧城区景观格局变化及破碎度进行了对比,最后结合社会经济和城市发展政策因素,分析了成都城市景观格局变化的驱动力。研究结果表明:2000~2010年期间,成都市的景观特征发生了较大变化,建设用地保持较快的增长速度,其比例由5.65%上升至10.39%;耕地面积比例由61.41%下降至53.90%,但仍然是成都全市域的优势生态系统,比例维持在50%以上;中心城区城镇化景观变化更加明显,建设用地面积比例增加了13.41%,是中心城区的优势景观类型,耕地比例相应减少24.14%。人口规模的增加、产业结构调整以及城市发展政策的变化是导致景观格局变化的主要因素。

关键词：城镇化景观格局景观指数驱动力成都

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atlas of dynamic spectra of fast radio burst FRB 20201124A

引用

chinese Physics B 2023年第2期32卷 1-4页

作者：王铂钧胥恒姜金辰徐江伟牛佳瑞陈平李柯伽张冰朱炜玮东苏勃张春风傅海周德江张永坤王培冯毅李晔李冬子鲁文宾杨元培 RNCaballero 蔡策陈卯蒸戴子高艾力·伊沙木丁甘恒谦韩金林郝龙飞黄玉祥姜鹏李承奎李菂李辉李新乔李志玄刘志勇罗睿门云鹏牛晨辉彭文溪钱磊宋黎明孙京海王发印汪敏王娜王维扬吴雪峰肖硕熊少林徐永华徐仁新杨俊杨轩姚蕊易祁彬岳友岭于东俊余文飞袁建平张彬彬张松波张双南赵一郑伟康朱岩邹金航 Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Department of Astronomy Peking UniversityBeijing 100871China University of chinese academy of Sciences Chinese Academy of SciencesBeijing 100049China Department of Particle Physics and Astrophysics Weizmann Institute of ScienceRehovot 76100Israel Nevada Center for Astrophysics University of NevadaLas VegasNV 89154USA Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA Department of Physics&Astronomy University of IowaIowa CityIA 52242USA Zhejiang laboratory HangzhouZhejiang 311121China Purple mountain Observatory Chinese Academy of SciencesNanjing 210008China TAPIR Walter Burke Institute for Theoretical PhysicsMail Code 350-17CaltechPasadenaCA 91125USA Department of Astronomy University of California at BerkeleyBerkeleyCA 94720USA South-Western Institute For Astronomy Research Yunnan UniversityYunnan 650504China key laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Science and Technology of china Anhui 230026China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Guizhou Normal University Guiyang 550001China CSIRO Space and Astronomy EppingNSW 1710Australia Max-Planck institut fur Radioastronomie Auf Dem HugelBonn53121Germany School of Astronomy and Space Science Nanjing UniversityNanjing 210093China State key laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China key laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210093China College of Physics Hebei Normal UniversityShijiazhuang 050024China

Fast radio bursts(FRBs) are highly dispersed millisecond-duration radio bursts,[1,2]of which the physical origin is still not fully understood. FRB 20201124A is one of the most actively repeating FRBs. In this paper, we present the collection of 1863 burst dynamic spectra of FRB 20201124A measured with the Five-hundred-meter Aperture Spherical radio Telescope(FAST). The current collection, taken from the observation during the FRB active phase from April to June 2021, is the largest burst sample detected for any FRB so far. The standard PSRFITs format is adopted, including dynamic spectra of the burst, and the time information of the dynamic spectra, in addition, mask files help readers to identify the pulse positions are also provided. The dataset is available in Science Data Bank, with the link https://***/10.57760/sciencedb.j00113.00076.

关键词： fast radio burst FAST

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：