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Estimation methods of eco-environmental water requirements: Case study

Science china Earth Sciences 2005年第8期48卷 1280-1292页

作者： yang zhifeng1,{1., {2. normal University, beijing 100875, china 2. State Key Joint Laboratory of environmental Simulation and Pollution Control, beijing 100875, china 1. school of {1. Beijing Normal University 100875 Beijing China 2. State Key Joint Laboratory of {1.al Simulation and Pollution Control 100875 Beijing China

Supplying water to the ecological environment with certain quantity and quality is significant for the protection of diversity and the realization of sustainable development. The conception and connotation of eco-environmental water requirements, including the definition of the conception, the composition and characteristics of eco-environmental water requirements, are evaluated in this paper. The classification and estimation methods of eco-environmental water requirements are then proposed. On the basis of the study on the Huang-Huai-Hai Area, the present water use, the minimum and suitable water requirement are estimated and the cor-responding water shortage is also calculated. According to the interrelated programs, the eco-environmental water requirements in the coming years (2.1., 2.30, 2.50) are estimated. The result indicates that the minimum and suitable eco-environmental water requirements fluc-tuate with the differences of function setting and the referential standard of water resources, and so as the water shortage. Moreover, the study indicates that the minimum eco-environmental water requirement of the study area ranges from 2.84×1.1.m3 to 1.02.1.1.m3, the suitable water requirement ranges from 6.45×1.1.m3 to 1.78×1.1.m3, the water shortage ranges from 9.1.1.9m3 to 2.1.×1.1.m3 under the minimum water requirement, and it is from 3.07×1.1.m3 to 7.53×1.1.m3 under the suitable water requirement. According to the different values of the water shortage, the water priority can be allocated. The ranges of the eco-environmental water re-quirements in the three coming years (2.1., 2.30, 2.50) are 4.49×1.1.m3?1.73×1.1.m3, 5.99×1.m3?2.09×1.1.m3, and 7.44×1.1.m3?2.52.1.1.m3, respectively.

关键词： eco-environmental water requirements, assessment methods, Huang-Huai-Hai area.

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Eco-environmental water demands for the Bai{1.dian Wetland

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Frontiers of environmental Science & Engineering 2008年第1期2卷 73-80页

作者： Ping ZHONG zhifeng {1. {2. cui jingling liu State Key Laboratory of Water environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China Research Center for environment Protection and Transportation Safety China Academy of Transportation Sciences Ministry of CommunicationsBeijing 100875China

In recent years,the hydrological characters of Baiyangdian Wetland have changed greatly,which,in turn,influence the biotic component,the structure and function of the wetland *** order to determine the demands for water resources of ecological wetland system,a method of ecological water level coefficient was suggested to calculate the water resources demands for wetland {1. *** research showed that the minimum coefficient is 0.94 and the optimal coefficient is more than *** to these two coefficients,the ecological water level and water quantity can be *** results indicate that the amount of the minimal and optimal eco-{1.al water require-ments are 0.87×1.^(8) and 2.78×1.^(8)m^(3) in average monthly,respectively,with the maximum eco-{1.al water requirement in summer and the minimum in *** annual change of eco-{1. water demand is in accord-ing with the climate change and hydrological *** method of ecological water level emphasizes that wetland ecosystem adapts to the hydrological conditions,so it can be used in practice well.

关键词： ecological water level eco-environmental water requirements ecological water level coefficient Baiyangdian Wetland

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原位异体肝移植术后新发慢性肾脏病的危险因素和预后分析

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国际麻醉学与复苏杂志 2022年第1期43卷 51-57页

作者：段怡高志峰王晓宇孟园园崔蕾陈烨张欢清华大学附属北京清华长庚医院麻醉科清华大学临床医学院北京102218

目的探索术前估测肾小球滤过率(estimated glomerular filtration rate,eGFR)正常的成年人肝移植术后新发慢性肾脏病(new-onset chronic kidney disease,NOCKD)的围手术期危险因素,为NOCKD高危人群的筛查提供早期预测模型。方法采用回... 详细信息

目的探索术前估测肾小球滤过率(estimated glomerular filtration rate,eGFR)正常的成年人肝移植术后新发慢性肾脏病(new-onset chronic kidney disease,NOCKD)的围手术期危险因素,为NOCKD高危人群的筛查提供早期预测模型。方法采用回顾性病例对照研究方法,选择2.1.年1.至2.2.年1.在北京清华长庚医院接受原位异体肝移植的成年受体,通过医院电子病例系统采集受体围手术期数据。对病例进行纳排筛选和分组后,先后运用单因素分析和多因素二元Logistic回归分析确定肝移植后1.内NOCKD发生率的独立危险因素。采用Kaplan-Meier和log-rank检验评估NOCKD受体和非NOCKD受体的生存时间。结果本研究共纳入1.4例受体,2.例(1..1.)出现了肝移植后NOCKD。多因素二元Logistic回归分析模型显示,术前糖尿病史[比值比(odds ratio,OR)=3.477,95%CI(1.1.3,1..394)]、终末期肝病模型(model for end stage liver disease,MELD)评分[OR=1.1.9,95%CI(1.038,1.2.8)]、术后行连续肾脏替代治疗(continuous renal replacement therapy,CRRT)[OR=1..32.,95%CI(1.855,69.1.1.]是移植后1.NOCKD的独立危险因素。NOCKD受体的1.生存率明显低于非NOCKD受体(89.3%比98.5%,χ^(2.=6.004,P=0.01.)。结论受体术前合并糖尿病、术前较高的MELD评分和术后行CRRT是原位异体肝移植术后NOCKD的独立危险因素,可为制定个体化临床决策和预测受体术后1.病死率提供参考。

关键词：肝移植慢性肾脏病围手术期危险因素糖尿病

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