Results 21 to 30 of about 33,547 (96)

坡面流及土壤侵蚀动力学(II)土壤侵蚀

open access: yes, 2004
介绍了坡面土壤侵蚀的基本特征和主要类型,综述了坡面土壤侵蚀动力学过程和预报模型等方面的研究进展,包括土壤表层结皮、雨滴溅蚀、片流侵蚀、细沟侵蚀、坡面流输沙、土壤侵蚀界限坡度,以及土壤侵蚀预报模型等 ...
陈力, 李家春, 向华, 刘青泉
core   +2 more sources

土壤侵蚀信息熵:单元地表可蚀性的综合度量指标

open access: yesShuitu Baochi Xuebao, 2002
提出了土壤侵蚀信息熵 (侵蚀熵 )的概念 ,并以公式 H=- cΣni=1 ωiaijlog(ωiaij)来表达。当把侵蚀过程的影响因子分为外部的降雨因子和内部的下垫面因子时 ,侵蚀熵在本质上反映的是土壤侵蚀下垫面可侵蚀性的综合信息。侵蚀熵模型可用于土壤侵蚀过程的空间数字模拟 ,预测水土保持措施的客观效果。侵蚀熵模型与降雨侵蚀力 R(R=EI30 )的乘积γHR(γ为因次换算系数 ...
朱启疆 帅艳民 陈雪 甘大勇 于芳
doaj   +2 more sources

东北黑土区不同季节侵蚀沟形态发育比较分析

open access: yesShuitu Baochi Xuebao, 2022
侵蚀沟形态特征是了解沟蚀发生、发育的关键性因素, 探究不同季节侵蚀沟形态参数变化特征对深入理解侵蚀沟的侵蚀过程和侵蚀沟的治理工作具有重要意义。选取黑龙江省海伦市光荣小流域内的3条侵蚀沟为研究对象, 探究季节变化下侵蚀沟长度、面积、体积等形态参数值的差异。结果表明: (1)不同季节侵蚀沟横断面形态由沟头到沟尾均呈现出由"V"形向"U"形转变; (2)侵蚀沟在降雨期由沟头前进和沟尾后退所引起的长度增加量大于融雪期由沟头前进所引起的长度增加量; (3)侵蚀沟面积在降雨期的增加量大于融雪期 ...
宋爽, 范昊明, 牛天一
doaj  

基于GIS黄土高原土壤侵蚀因子的厘定

open access: yesShuitu Baochi Xuebao, 2003
以ARC/INFO为平台,构建黄土高原自然侵蚀因素和人为侵蚀因子数据库,通过对研究区合理的网格单元划分,利用GIS空间分析功能,提取各网格单元自然社会侵蚀变量,经过数据的预处理,整合各单元侵蚀因子,建立侵蚀与侵蚀因子定量模型,提炼主导侵蚀因素,度量主要侵蚀因素对侵蚀的贡献。
曹瑜 杨志峰 袁宝印 沈珍瑶
doaj   +2 more sources

MXene@BN Heterostructures Supported Polytetrafluoroethylene Coatings for Superior Friction Performance in Hydrothermal Environments

open access: yesRare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT Mechanical dynamic sealing components are usually subjected to the erosion of a hydrothermal environment; thus, the selected service materials must meet stringent requirements for superior self‐lubrication, corrosion resistance, and thermal stability.
Yanchun Zhao   +8 more
wiley   +1 more source

土壤侵蚀的流体力学机制(Ⅱ)-风蚀

open access: yes, 1996
土壤的加速侵蚀已成为当前全球性环境灾害之一.对土壤侵蚀及其预防、控制的研究引起了人们的普遍关注.本文通过对国外文献的广泛调研 ...
王柏懿, 戚隆溪
core   +2 more sources

Critical Infrastructure, Climate Disasters, and Cultural Survival: Policy Failures and Community Displacement in the Era of Managed Retreat

open access: yesJournal of Critical Infrastructure Policy, Volume 7, Issue 2, Fall/Winter 2026.
ABSTRACT Climate disasters are currently changing territory around the world by showing large inequalities that exist in infrastructure systems, governance arrangements, and development pathways. In many cases, climate risk response strategies like managed retreat have been framed as practical approaches to respond to increasing climate disasters ...
Chick Edmond
wiley   +1 more source

子午岭林区不同地形部位开垦裸露地降雨侵蚀力的研究

open access: yesShuitu Baochi Xuebao, 1994
在分析了子午岭林区开垦裸露地降雨侵蚀资料的基础上,首次研究了不同地形部位开垦裸露地上的侵蚀性降雨底值,侵蚀性降雨雨型与土壤侵蚀量的关系和降雨侵蚀力定量指标及其与土壤侵蚀量的关系,其结构表明,引起土壤侵蚀性降雨底值次降雨量为10m,I10为0.4mm/min或I30为0.25mm/min。在侵蚀性降雨雨型中,以突发型侵蚀性降雨雨型引起的侵蚀量最大,其次为峰值型 ...
郑粉莉 唐克丽
doaj   +2 more sources

Temporal and spatial variations of rainfall erosivity in the northern and southern regions of Qinling mountains from 1960 to 2017(1960―2017 年秦岭南北地区降雨侵蚀力的时空变化特征研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2019
基于秦岭南北地区1960―2017 年47 个气象站点逐日降雨资料,根据章文波提出的日降雨侵蚀力模型估算降雨侵蚀力,并采用气候倾向率、反距离权重插值及Mann-Mendal 突变检验等方法分析秦岭南北地区近58 a年均降雨侵蚀力与不同量级降雨侵蚀力的时空变化特征。结果表明:(1) 1960―2017 年秦岭南北地区年均降雨侵蚀力与不同雨量产生的降雨侵蚀力均呈由南向北递减的特征。(2) 近58 a,秦岭南北地区年均降雨侵蚀力、大雨与暴雨侵蚀力年际变化呈增长趋势,未通过突变检测;中雨侵蚀力呈减弱趋势 ...
LUXin(芦鑫)   +2 more
doaj   +1 more source

Broad‐Spectral Response Lead Halide Perovskite Solar Cells Through Integration of Multifunctional Organic Bulk‐Heterojunction and Quantum‐Cutting Downconversion Materials

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He   +9 more
wiley   +1 more source

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