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A Study on Description Methods of Sediment Transport Modulus in Small Watersheds

meteorological and Environmental Research 2021年第5期12卷 50-54页

作者： Zhiguang LI Liyi ZHAO The Center of Soil and Water Conservation Monitoring Ministry of Water ResourcesBeijing 100055China Tianshui Governance and Supervision bureau of Yellow River Soil and Water Conservation Tianshui 74100Chin

[Objective]This study aimed to clear the advantages,disadvantages and applicability of various analysis methods to assess sediment transport modulus in small watersheds using the multi-year observation data. [Method]Four methods,including the statistical eigenvalues,depolarized arithmetic mean,frequency of erosion intensity and box-whisker plots were applied into calculation of sediment transport modulus in four small watersheds,and then the results of the methods were compared to to filter a method with the widest applicability and scientific validity. [Result] The statistical arithmetic mean and median could hardly represent the concentration and general level of multi-year sediment transport modulus. Although the depolarized arithmetic mean had the tendency of reflecting the general level of data,it lost the extreme value and its information for making decision. The frequency of erosion intensity grade reflected the distribution of data in intensity classification. Box-whisker plot could show the concentration,dispersion and the number of abnormal data. [Conclusion] Multiple methods can be combined to comprehensively and objectively characterize the multi-year sand transport modulus due to their advantages and disadvantages. Additionally,box-whisker plot has good objectivity and applicability in displaying the multi-year data of small watershed.

关键词： Small watershed Sediment transport modulus General situation of many years Description methods Multi-year average Box-whisker plot

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Basic Works of Flash Flood Disaster Analysis and Assessment in Rucheng County of Hunan Province

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meteorological and Environmental Research 2017年第6期8卷 36-40页

作者： Zhang Miao Zhang Qiyi Li Changzhi Qin Cheng Zhu Chunxiu China Institute of Water Resources and Hydropower Research Beijing 100038China Research Center on Flood&Drought Disaster Reduction of the Ministry of Water Resources Beijing 100038China Hunan Water Resources and Hydropower Research Institute Changsha 410007China Rucheng Water Resources bureau in Chenzhou City of Hunan Province Chenzhou 424100China

The method and experience of basic work of flash flood disaster analysis and assessment in early period are introduced in a case of Rucheng County,Chenzhou City,Hunan Province,containing analysis of general situation in county region,excavation of working map information,determination of assessment object list,examination of investigated data,and standardized arrangement of data. Finally,the suggestions for basic work of analysis and assessment are given,which could provide the references for implementing analysis and assessment work of flash flood disaster in other regions.

关键词： Flash flood disaster prevention and control Analysis and assessment Basic work Rucheng County

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