Results 51 to 60 of about 9,186 (162)

Riverine Nitrate Export Response to Hydro-climatic Variability in a Southeast China Coastal Watershed Based on Long-term Historical Data [PDF]

open access: yes, 2015
气候变化对不同的自然地理区域的淡水系统,尤其是人口集中、对水资源高度依赖的近海流域的潜在影响的研究对于制定合理的水资源管理策略至关重要。本篇论文选取中尺度近海流域—九龙江流域,基于1961-2013年近53年的水文-气候与硝酸盐水质数据,评估气候变化对流域水量和水质及通量的影响。研究结果表明,在过去的50年里,九龙江北溪和西溪年径流量没有明显变化趋势,但随年降雨变化,呈自然波动。本研究开发的L-R图解法显示土地变化加强了气候变化对径流动态的影响。上世纪60年代至90年代之间,硝酸盐的浓度增加了30倍 ...
AYU ERVINIA
core  

Ensuring sustainable water security through sustainable land management: Research evidences for policy

open access: yesWorld 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

Observation and Dynamical Analysis of Hydrographic Characteristics in the Pearl River Estuary in summer of 2015 [PDF]

open access: yes, 2017
本文以实测CTD数据为基础,总结了2015年夏季珠江口海域及其冲淡水扩展路径上的水文特征。在结合遥感风场和定点浮标风场数据的基础上,分析了台风“莲花”影响下珠江口水体的温、盐度特征,以及珠江冲淡水扩展方式对于风场变化的响应情况。同时对航次过程中观测到的温度逆转现象的特征进行统计分析;并结合遥感数据对冲淡水影响区域的海表温度数据和叶绿素a浓度的分布特征进行研究。 2015年7月6日至17日珠江口航次CTD资料的分析表明:在香港的西南侧观测到相对的低温高盐中心;珠江口附近海域存在海水的垂向逆温现象 ...
陈希荣
core  

Making multisectoral committees work: Lessons from tobacco control in two Pacific small island developing states

open access: yesWorld 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

Research of Water Environmental Capacity and Total Amount Control of the Yongding River [PDF]

open access: yes, 2016
水不仅作为地球环境中的基本因子,也是维护人类生活和社会稳定的核心自然要素。近几十年来伴随我国改革开放带来的社会经济跨越式发展,水污染问题日益突出,水环境质量明显下降,严重地影响了人民的生产、生活及周边的生存环境。要解决水污染问题,首先应确定水环境容量,控制污染物排放总量。因此,对流域水质、水环境容量进行全面、系统地分析并确定流域的水环境容量,是执行污染物总量控制的基本手段,也是有效保护和合理利用水资源的依据。开展流域水环境容量核算研究既可以制定合理的污染物排放总量控制目标 ...
苏源
core  

Attribution analysis of water-sediment variation under the influence of climate change and human activities in the Kuye River Basin [PDF]

open access: yes
The attribution of the evolution of water and sediment in a river basin is an important theoretical issue in hydrogeology. To understand the change patterns of water and sediment in the Kuye River Basin and provide scientific basis for water resources ...
Jiankang ZHANG   +2 more
core   +1 more source

A N–CoSe/CoSe2–C@Cu hierarchical architecture as a current collector‐integrated anode for potassium‐ion batteries

open access: yesRare Metals, Volume 43, Issue 8, Page 3702-3712, August 2024.
Graphical abstract AbstractThe highly reversible insertion/extraction of large‐radius K+ into electrode materials remains a tough goal, especially for conversion‐type materials. Herein, we design a current collector‐integrated electrode (N–CoSe/CoSe2–C@Cu) as an advanced anode for potassium‐ion battery (PIBs).
Zi‐Jie Mu   +9 more
wiley   +1 more source

玉米成熟期黄壤坡耕地径流及其氮素流失特征研究

open access: yesShuitu Baochi Xuebao, 2018
以顺坡垄作、平作、横坡垄作坡面为研究对象,研究自然降雨条件下,黄壤坡耕地地表径流、壤中流及其氮素流失特征,以期为研究区氮素流失预测和有效防控提供科学依据。结果表明:自然降雨条件下,玉米成熟期平均地表径流量分别为0—20,20—40 cm壤中流量的7.96,8.22倍。不同耕作措施间地表径流量和氮素流失量差异显著,地表径流量和氮素流失量均表现为顺坡垄作 > 平作 > 横坡垄作,顺坡垄作坡面地表径流量分别是平作和横坡垄作的1.20,2.07倍,顺坡垄作坡面氮素流失量分别是平作和横坡垄作的1.35,2.06倍。
王双, 叶良惠, 郑子成, 李廷轩
doaj  

Dynamic Linkage between Land-use and Water Quality in the Potomac River Basin and Its Management Implications [PDF]

open access: yes, 2017
流域是一个具有特定结构和功能、相对独立完整的自然资源-生态环境-人类社会的复杂系统,承载了区域经济发展所需要的空间。人类及其他生物以其生活的流域作为物质依托,从中获取水、食物等物质资源和生活、娱乐、发展活动的空间资源。然而在社会经济高速发展的背景下,作为人类重要物质与空间依托的流域,其环境遭受来自各方面的多重影响因子的共同作用,其中以河流水质为主,正面临着日渐退化的趋势,因而保护人们赖以生存的环境迫在眉睫。很多人为因素包括城市化、农业活动、产业、污水排放都是影响河流水质的流域土地利用 ...
卞京
core  

引江济淮工程对派河水环境的影响 [PDF]

open access: yes, 2019
引江济淮工程是淮河流域水资源战略配置及巢湖和淮河水环境综合治理的重要措施,并列入国家加快推进的172项重大水利工程。引江济淮工程派河段是按照丰、枯水期严格设计的,派河水质不仅直接影响巢湖口的水质,还将间接影响淮河水质。结合派河现状水文、水质条件,采用明槽恒定均匀流公式预测了引江济淮工程对派河规划年水文情势的影响,预测结果表明:工程实施后,派河水位将升高1. 01~2. 32 mm,流速将增大0. 24~0.
刘花台   +5 more
core   +1 more source

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