Results 41 to 50 of about 631 (110)
World Water Policy, Volume 10, Issue 4, Page 1170-1186, November 2024.Abstract Sustainable land management (SLM) practices is a key to reducing rates of land degradation and has proven to ensure water security by increasing soil moisture availability, decreasing surface runoff, decreasing soil erosion, increasing infiltration, and decreasing flood discharge. Land degradation is adversely affecting over 75% of the Earth's
Melku Dagnachew +5 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为了研究间作体系下地表特性对土壤侵蚀的影响，采用人工降雨法分析了玉米马铃薯间作及起垄在不同降雨强度（40，80 mm/h）下的水力学参数的变化特征。结果表明：（1）同一降雨强度下玉米马铃薯间作的阻力系数高于玉米单作处理，雷诺数、弗劳德数和径流流速低于单作玉米处理（P0.05）。（2）同一降雨强度下间作高垄的阻力系数最高，径流流速、雷诺数和弗劳德数最低。40 mm/h降雨强度下间作高垄、间作低垄、玉米高垄的径流流速分别比玉米低垄分别减少35.71%，35.71%和14.29 ...
欧阳铖人 +4 more
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云南省玉龙县天保工程森林生态系统服务功能价值评估 [PDF]
, 2017 参照LY/T 1721—2008《森林生态系统服务功能评估规范》,结合云南省玉龙县天保工程森林生态服务功能特点,借鉴国内外对森林生态系统服务功能研究成果,筛选评价指标并建立指标体系;利用玉龙县森林资源清查报告、玉龙县天保工程基础数据、玉龙县林业统计年报、玉龙县统计年鉴、已有生态监测研究成果等资料,对天保工程1998年至2015年森林生态系统服务功能价值进行评估。结果表明:1998年至2015玉龙县天保工程区森林生态系统服务功能总价值约为4 945.15亿元。从变化趋势看,其总价值随时间推移呈上升趋势 ...
支玲, 杨芳, 王晨炜, 郭小年
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World Medical &Health Policy, Volume 16, Issue 3, Page 405-426, September 2024.Abstract The consumption of harmful commodities drives the noncommunicable disease (NCD) epidemic globally and in Pacific small island developing states. Multisectoral committees are commonly chosen avenues to facilitate policy coherence across government sectors in regulating the commercial determinants of health (CDoH), but these committees often ...
Dori Patay, Ashley Schram, Sharon Friel
wiley +1 more source
An Analysis of the Risk of Robust Recursive Updating Model [PDF]
, 2011 抗差递推校正模型在抵御流量异常值对实时校正精度影响方面效果明显,但同时也存在将真实值作为异常值剔除,校正误差更大的风险。利用蒙特卡洛方法,分析不同状况下,抗差递推校正模型风险与效果的关系。结果表明抗差递推校正模型的风险受异常值发生频率影响较大。Robust recursive updating model is insensitive to the outliers and is effective to stable flood updating accuracy.At the same time ...
赵超
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Ultrasound in Obstetrics &Gynecology, Volume 63, Issue 4, Page 446-456, April 2024.ABSTRACT Objective To determine the diagnostic accuracy of prenatal ultrasound in detecting coarctation of the aorta (CoA). Methods An individual participant data meta‐analysis was performed to report on the strength of association and diagnostic accuracy of different ultrasound signs in detecting CoA prenatally.
C. Villalaín +20 more
wiley +1 more source
Shuitu Baochi Xuebao, 2018 为研究坡地的降雨产流分配及水文动态过程，以侵蚀性风化花岗岩坡地为研究对象，采用室内人工模拟降雨的方法研究不同降雨强度（30,60,90,120,150 mm/h）和不同坡度（5°,8°,15°,25°）条件下坡面径流和壤中流的分配特征与水文过程。结果表明：坡面径流的初始产流时刻均随降雨强度和坡度的增大而提前，壤中流的初始产流时刻明显滞后于坡面径流。壤中流径流量在不同坡度下随降雨时间的延长呈先递增后趋于平稳的现象，雨强越大达到峰值的时间越早，在降雨停止一段时间后径流量开始下降。多数情况下 ...
邓龙洲 +5 more
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The Water Environment and the Construction of Jinan City in Ming and Qing Dynasties [PDF]
, 2014 历史上济南的水环境优越。这是济南立城的重要环境基础，但济南城的扩展过程也受到了水环境的制约。水环境的不同使城市近郊有不同的发展。为保障城市的排水排洪，环城修建了护城河，东西郊修建了排水沟。济南泉水丰沛，泉水是济南城的主要水源。泉水汇成的河流是济南近郊农田的灌溉来源。水资源的丰富使济南城建有许多各种类型的园林。济南的传统民居错落在各个泉眼周围，济南城是一座园林化的城市。 本文通过翻阅有关济南的地方志和一些文人文集，收集了济南水环境与城市建设的一些资料，来观察水如何影响着人们对居住地的选择 ...
赵雅洁
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Analysis of the characteristics and development trends of the “7•5” catastrophic debris flow in Xiangjiao gully, Muli County, Sichuan [PDF]
On July 5, 2021, a catastrophic debris flow disaster occured in Xiangjiao gully, Muli County, Sichuan Province. This study analyzed the formation conditions, eruption process and eruption characteristics of the debris flow through field investigation and
Hao SUN +4 more
core +1 more source
Shuitu Baochi Xuebao, 2001 利用供沙土槽和试验土槽的双土槽径流小区 ,定量研究了在不同降雨强度下上方来水来沙对陡坡地细沟侵蚀产沙过程和细沟水流水力学参数的影响及其细沟水流水力学特征参数与细沟侵蚀产沙量的关系。结果表明 :坡面细沟侵蚀过程以侵蚀—搬运过程为主 ,坡上方来沙不仅被径流全部搬运 ,且上方来水在坡下方引起了另外的侵蚀产沙量 ,其值随上方来水含沙量的减少和降雨强度的增加而增大。上方来水的汇入或降雨强度的增大可使细沟水流流态由层流转化为紊流。上方来水对细沟水流水力学参数 (流速、水力半径、雷诺数、弗劳德数和阻力系数 ...
肖培青 郑粉莉 等
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