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临水下游河段干旱警戒水位(流量)确定分析
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作者 杨振宇 《江西水利科技》 2023年第4期283-287,共5页
本文在《旱限水位(流量)确定办法》的基础上,以临水下游河段为例,分析娄家村水文站历史资料,并结合河段用水类型调查,分别对城乡供水、企业生产、农业灌溉、交通航运和环境生态等主要因子的需水量进行分析计算,综合确定娄家村水文站控... 本文在《旱限水位(流量)确定办法》的基础上,以临水下游河段为例,分析娄家村水文站历史资料,并结合河段用水类型调查,分别对城乡供水、企业生产、农业灌溉、交通航运和环境生态等主要因子的需水量进行分析计算,综合确定娄家村水文站控制断面干旱警戒流量、干旱警戒水位。 展开更多
关键词 干旱警戒水位 干旱警戒流量 临水下游 娄家村水文站
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辽河平安堡站旱警水位(流量)确定研究 被引量:2
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作者 张静 《中国防汛抗旱》 2023年第6期77-79,共3页
目前,全国大部分省(自治区)均开展了部分河道站点旱警水位计算工作,但由于河流特点及抗旱任务不同,因此选用方法不一。选取辽河重点控制站——平安堡站为研究对象,综合考虑河道内生态需水、河道外生活生产需水等,采用综合法计算河道站... 目前,全国大部分省(自治区)均开展了部分河道站点旱警水位计算工作,但由于河流特点及抗旱任务不同,因此选用方法不一。选取辽河重点控制站——平安堡站为研究对象,综合考虑河道内生态需水、河道外生活生产需水等,采用综合法计算河道站点旱警水位(流量),以便为辽宁省抗旱预警工作提供支撑。 展开更多
关键词 干旱预警水位 干旱预警流量 平安堡站 辽河
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水质评价中河道流量级的划分 被引量:1
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作者 马唐宽 《水资源保护》 CAS 1992年第3期35-39,共5页
在现行的水质评价中,常常避开和流量大小相联系,只采用浓度进行。在河道容量没有确定的情况下,按总量控制进行评价是难以进行的,水质的好坏程度与水量的大小息息相关。为使水质水量结合起来,本文利用以往大量的水质资料和相应的水量资料... 在现行的水质评价中,常常避开和流量大小相联系,只采用浓度进行。在河道容量没有确定的情况下,按总量控制进行评价是难以进行的,水质的好坏程度与水量的大小息息相关。为使水质水量结合起来,本文利用以往大量的水质资料和相应的水量资料,选取河道主要污染指标,进行统计和评价,从而得出不同流量下的水质污染状况。以多年平均径流量和多年平均最小三个月流量为两个界限,把水质评价分为丰、平、枯三个水期分别进行。可以发现,这样进行评价使河道水质评价更趋合理,同时也能发现我们水质监测中定点定时监测的不合理性,并可根据枯水流量的大小对河道污染趋势进行初步预估。 展开更多
关键词 流量 纳污量 定常排污 干旱流量
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Results of a CLM4 Land Surface Simulation over China Using a Multisource Integrated Land Cover Dataset 被引量:1
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作者 YU Yan XIE Zheng-Hui +1 位作者 WANG Yuan-Yuan CHEN Feng 《Atmospheric and Oceanic Science Letters》 CSCD 2014年第4期279-285,共7页
In this study, the high-accuracy multisource integrated Chinese land cover (MICLCover) dataset was used in version 4 of the Community Land Model (CLM4) to assess how the new land cover information affected land su... In this study, the high-accuracy multisource integrated Chinese land cover (MICLCover) dataset was used in version 4 of the Community Land Model (CLM4) to assess how the new land cover information affected land surface simulation over China. Compared to the default land cover dataset in CLM4, the MICL data indicated lower values for bare soil (14.6% reduction), nee- dleleaf tree (3.6%), and broadleaf tree (1.9%); higher values for shrub cover (1.8% increase), grassland (9.9%), cropland (5.0%), glaciers (0.5%), lakes (1.6%), and wetland (1.1%); and unchanged for urban areas. Two comparative CLM4 simulations were conducted for the 33-yr period from 1972 to 2004, one using the MICL dataset and the other using the default dataset. The results revealed that the MICL data produced a 0.3% lower mean annual surface albedo over China than the original data. The largest contributor to the reduced value was semiarid regions (2.1% reduction). The MICL-data albedo value agreed more closely with observations (MODIS broad- band black-sky albedo products) over arid and semiarid regions than for the original data to some extent. The simulated average sensible heat flux over China increased by only 0.1 W m 2 owing to the reduced values in arid and semiarid regions, as opposed to increases in humid and semihumid regions, while an increased latent heat flux of I W m-2 was reflected in almost identical changes over the whole region. In addition, the mean annual runoff simulated by CLM4 using MICL data decreased by 6.8 mm yr-1, primarily due to large simulated decreases in humid regions. 展开更多
关键词 land cover MICLCover MODIS land surface simulation CLM4
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Tree-ring reconstruction of streamflow for Palgong Mountain forested watershed in southeastern South Korea 被引量:3
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作者 EWANE Basil Ewane Heon-Ho LEE 《Journal of Mountain Science》 SCIE CSCD 2017年第1期60-76,共17页
Tree-ring chronologies from pine,oak and black locust tree species were used to reconstruct annual streamflow and examine hydrological drought years for Palgong Mountain forested watershed in southeastern South Korea ... Tree-ring chronologies from pine,oak and black locust tree species were used to reconstruct annual streamflow and examine hydrological drought years for Palgong Mountain forested watershed in southeastern South Korea for the period from 1954-2015. The backward elimination multiple regression analysis provided the statistically significant predictor chronologies of streamflow. The final calibration and verification test models accounted for 84.8% and 81.6%,respectively,of the variability in streamflow observed in the gage data. Further verification of the validity of the reconstructed model was undertaken with the Pearson Correlation Coefficient,the Reduction of Error Test,and the Durbin-Watson Statistics and indicated fidelity of the model for reconstructing the annual streamflow. Analyses of the reconstructed annual streamflow indicate that the most persistent years of high flows above the median annual discharge occurred from 1986-2008.This period included 7 single or multiple years of highest flow above the 90 th percentile discharge and multiple years of high flows with a time interval of 2-6 years,although with intervening multiple years of low flows below the 10 th and 50 th percentile. In comparison,the most persistent years of low flows below the median annual discharge occurred from 1954-1985 and 2009-2015. This period included 8 single or multiple years of lowest flow below the 10 th percentiledischarge and multiple years of low flows with a time interval of 2-9 years,although also with intervening multiple years of high flows above the 50 th percentile. No single years of extreme hydrological droughts below the 10 th percentile were identified from 1986-2015 whereas a greater proportion of high flows above the 90 th percentile occurred during this period. The persistent single or multiple years of lowest flows between 1954 and 1985 were the recent most critical hydrological drought years identified in the Palgong Mountain forested watershed providing supportive evidence of the severity of past hydrological droughts during that period,applicable to the southeastern South Korea where the study watershed is located. This interpretation agrees with the hydrological drought event years identified from 1951 to the early 1980 s in a related national study that used precipitation proxy data to reconstruct past occurrences of droughts in Korea. 展开更多
关键词 Climate variability Hydrological droughts High flows P densiflora Q mongolica Streamflow Tree ring
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The Effects of Climate Change and Sea Level Rise on Dry Season Flows in Tien River and Hau River
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作者 Chuc Huynh 《Journal of Environmental Science and Engineering(A)》 2017年第5期239-242,共4页
Tien river and Hau river are two main branches of Cuu Long River which have hydrology regime directly effected by climate change and sea level rise. The flow of the dry season in the Tien and Hau rivers plays a key ro... Tien river and Hau river are two main branches of Cuu Long River which have hydrology regime directly effected by climate change and sea level rise. The flow of the dry season in the Tien and Hau rivers plays a key role in the socio-economic development of the Mekong Delta, especially in agricultural production. The study aims to provide useful information in socio-economic development planning and water use strategies for managers, planners and policymarkers of the provinces/cities in the Mekong Delta. This paper presents the study results in changing of dry season flows in Tien river and Hau river under the impacts of climate change in order to propose measures for protection, substainable development and water security. 展开更多
关键词 Climate change sea level rise dry season flows Tien river and Hau river.
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Changing Forestry Policy by Integrating Water Aspects into Forest/Vegetation Restoration in Dryland Areas in China 被引量:9
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作者 WANG Yanhui Mike Bonell +3 位作者 Karl-Heinz Feger YU Pengtao XIONG Wei XU Lihong 《Bulletin of the Chinese Academy of Sciences》 2012年第1期59-67,共9页
Restoration forestry (forest rehabilitation) or re-vegetation is one effective measure to solve environmental problems, notably soil erosion. It may be further stimulated by the Clean Development Mechanism for carbo... Restoration forestry (forest rehabilitation) or re-vegetation is one effective measure to solve environmental problems, notably soil erosion. It may be further stimulated by the Clean Development Mechanism for carbon sequestration. However, there is an intensive and on-going debate about the adverse effects arising from afforestation in dryland areas, such as soil drying up which may cause further damage to the success of forest restoration, and the water yield reduction from watershed which may harm the regional development. On other hand, some preliminary studies showed a possibility that these adverse effects may be diminished more or less by properly designing the system structure and spatial distribution of forest/vegetation in a watershed. However, it is urgent to develop an evidence-based and sustainable new forestry policy for harmonizing forest-water interrelation. As a leading country in afforestation, China is beginning to develop a more trans-disciplinary and cross-sectoral forestry policy for harmonizing forestry development with water management. The main points of the changing new forestry policy should include: (1) Establishing a regional development strategy focusing on harmonized forest-water relations; (2) Taking forest-water interactions as an important part of evaluation; (3) Reducing the 'eco-water' quota of forests through technical advancement; (4) Developing and extending water-adaptive forest management practices; (S) Strengthening forest ecohydrological research and decision support ability. 展开更多
关键词 forest restoration dryland areas water resources integrated management forestry policy China
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