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《水利水电科技进展》2014,(1)
<正>为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科技期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2021,(1)
正为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2017,(6)
<正>为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2017,(3)
<正>为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2021,(4)
正为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2021,(5)
正为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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《水利水电科技进展》2018,(6)
正为方便作者投稿,特将本刊的性质和对稿件的要求简要介绍如下:1本刊是一份科学技术期刊,主要刊登与水科学、水工程、水资源、水环境、水管理等有关的科技论文。因此,要求稿件内容有明确的主题,所介绍的科学技术有明显的创新性、先进性和实用性。2本刊欢迎下列内容的稿件,特别欢迎各类基金资助项目及其他重大科技项目的研究论文。(1)水资源利用、配置、节约和保护,包括:水资源形成、可再生性维持机理及时空变化规律;变化环境下的水循环及其伴生过程演化机理;水资源利用与生态保护的协调关系;河湖水系连通的水资源布局和调配;地表水、地下水及非传统水资源综合利用与调配;大区域干旱演变规律及风险评估;水资源的可持续利用方式及新型水资源的开发利用等。 相似文献
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陈莹 《水利科学与寒区工程》2023,(3):84-86
本文利用PHREEQE软件对承德市某研究区域周边浅层地下水的水文水化学迁移演变特征进行模拟,分析典型监测点浅层地下水中主要离子在特征条件下的水化学特征演化及地下水水文变化情况。结果表明:(1)本研究范围内,浅层地下水中的主要阳离子在迁移过程中受到了阳离子交换作用及裂隙型水-岩交换作用的影响;(2)随着浅层地下水迁移,研究区内浅层地下水水温及水位变化幅度小,且不易受到周边地下水开采活动影响。研究结果对理解研究区域浅层地下水的水文水化学特征具有一定的参考价值。 相似文献
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根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。 相似文献
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The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects. 相似文献
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Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m?2) was also greatest in this segment. Only four species (58 organisms, 48 mg m?2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m?2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m?2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m?2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river. 相似文献
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In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment. 相似文献
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V. K. Konovalov O. V. Yashkin V. V. Ermakov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2008,42(2):105-109
A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed
in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash
and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers
of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional
components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect
dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system,
configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants
of dry ash utilization and the advantages of producing of size-separated particles are considered.
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Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008). 相似文献
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Peter B. Bayley 《河流研究与利用》1991,6(2):75-86
The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed. 相似文献