灌溉输配水渠系水量调控的研究   总被引：2，自引：0，他引：2  

李明思  朱凤书 《灌溉排水学报》2000,19(3):77-80

对灌溉渠系水量调控研究进行了综合论述 ,不仅指出了这一领域的研究意义 ,而且还介绍了其发展过程、主要研究内容、研究方法以及现存的主要问题 ,同时还对部分问题提出了自己的观点  相似文献   

神府-东胜矿区人为泥石流沟道流域地形条件分析   总被引：1，自引：0，他引：1  

张丽萍  唐克丽  张平仓 《水土保持通报》2000,20(4):20-23

在对神府一东胜矿区人为泥石流沟道广泛野外调查的基础上,选取了４３条典型泥石流样沟。在１：１００００地形图及卫片上进行了形态要素量测,应用流域地貌分析原理,对所有样沟各形态要素进行了详细分析,结果认为,人为泥石流沟道地势比沿程变化特征为,以形成区比降最大,区别于自然泥石流沟道;沟道分区面积比以汇水区面积最大,明显区别于湿润地区;流域形状以扇形为主,沟道给养面积较大,崎岖系数不太大是半干旱地区人为泥石  相似文献   

滇西泥石流综合防治工程调查   总被引：1，自引：0，他引：1  

周麟 《水土保持通报》2000,20(2):24-27

调查了滇西泥石流综合防治工程的现状,指出了滇西泥石流综合防治工程中存在的主要问题.在此基础上,具针对性地提出今后滇西泥石流综合防治工程应引起足够重视和有待加强的工作环节.  相似文献   

Theoretical Analysis on 13-Bit Lattice Gas Automata Model with Poly-velocity and its Simulation     

ZHENG Zhong  GAO Xiao qiang 《保鲜与加工》2000,(6):82-86

An 13 bit lattice gas automata model has been investigated from fluid discrete dynamics. By gaining the moment equations from lattice Boltzmann equation and using Chapman Enskog expansion, the fluid dynamics equation and energy equation of 13 bit lattice gas automata model with polyvelocity have been deduced. The validity of the model using for non isothermal fluid dynamics has been proved . Finally, simulation results for non isothermal flow pass plate have been shown  相似文献   

内循环厌氧反应器三相分离器性能的研究     

訾灿  李向东  彭磊  陆飞鹏  郑晓宇 《中国沼气》2021,(1):32-39

三相分离器是厌氧反应器的核心部件,三相分离器研究的重点和难点在于揭示气液固三相分离过程.文章通过建立冷模实验系统探究了三相分离器气体分离收集的过程,并考察了曝气量、进水量对气相带水量、气相带水能力、颗粒流失等三相分离器性能的影响.研究结果表明:气相在三角堰内完成分离收集然后汇聚到集气室内,最后夹带一定量的液体由提升管排...  相似文献   

不适温度条件诱导西瓜嗜酸菌进入VBNC状态的研究     

王梦雨  蒋娜  阚玉敏  李健强  罗来鑫 《植物病理学报》2021,51(1):104-114

由西瓜嗜酸菌(Acidovoraxcitrulli)引起的瓜类果斑病,是危害西瓜和甜瓜等葫芦科作物的一种典型的种传细菌性病害.已有文章报道西瓜嗜酸菌在铜离子诱导下可进入"有活力但不可培养"(viable but non-culturable,VBNC)状态,并在适当条件下复苏,成为生产中潜在的病害初侵染来源.本文结合实...  相似文献   

我国企业信息化中CIO面临的问题与对策     

曹南 《河北农业大学学报(农林教育版)》2006,8(4):94-97

CIO是随着企业信息化管理而出现的新兴岗位。结合我国企业信息化的发展,分析了目前企业信息化管理中CIO存在的主要问题。根据这些问题提出了一些解决的对策:明确CIO职责,保证CIO的权利;强化CIO的外部职能;在信息化管理中发挥应有职能;加强自身素质,提高管理水平。  相似文献   

分户热计量系统中室内温度的分析     

崔明辉  贾立斌  吴雅琴 《河北农业大学学报》2006,29(3):110-112

根据分户热计量系统的供热特点,提出了分户热计量系统中室内设计计算温度的最佳值和适合我国国情的适用设计值;并给出了在调节过程中流量变化系数与室温变化之间的数学关系式。  相似文献   

锡澄运河整治工程双向竖井贯流泵站流道优化及分析     

袁尧  胡文竹  邓彬彬  杨帆  汤方平 《中国农村水利水电》2021,(1):36-41,47

针对锡澄运河整治工程竖井贯流泵站改造的需求,对双向竖井贯流泵装置原型进行了三维定常数值模拟.以泵站竖井流道为研究对象,分析比较了5种不同的竖井流道优化方案,重点分析了正反向运行时竖井流道的内流场特征.结果表明:前移竖井段,将竖井的迎水面的尖角改成圆弧形,并以各个断面的面积作为控制参数改善流态分布较差的断面面积,有助于水...  相似文献   

Effects of sediment load on the abrasion of soil aggregate and hydraulic parameters in experimental overland flow          下载免费PDF全文

WANG Jun-guang  YU Bing  NI Shi-min  GUO Zhong-lu  CAI Chong-fa 《农业科学学报》2020,19(4):1117-1126

The breakdown of soil aggregates under rainfall and their abrasion in overland flow are important processes in water erosion due to the production of more fine and transportable particles and, the subsequent significant effect on the erosion intensity. Currently, little is known about the effects of sediment load on the soil aggregate abrasion and the relationship of this abrasion with some related hydraulic parameters. Here, the potential effects of sediment load on soil aggregate abrasion and hydraulic parameters in overland flow were investigated through a series of experiments in a 3.8-m-long hydraulic flume at the slope gradients of 8.7 and 26.8%, unit flow discharges from 2×10~(–3) to 6×10~(–3) m~2 s~(-1), and the sediment concentration from 0 to 110 kg m~(–3). All the aggregates from Ultisols developed Quaternary red clay, Central China. The results indicated that discharge had the most significant(P0.01) effect on the aggregates abrasion with the contributions of 58.76 and 60.34%, followed by sediment feed rate, with contributions of 39.66 and 34.12% at the slope gradients of 8.7 and 26.8%, respectively. The abrasion degree of aggregates was found to increase as a power function of the sediment concentration. Meanwhile, the flow depth, friction factor, and shear stress increased as a power function along with the increase of sediment concentration at different slope gradients and discharges. Reynolds number was obviously affected by sediment concentration and it decreased as sediment concentration increased. The ratio of the residual weight to the initial weight of soil aggregates(Wr/Wi) was found to increase as the linear function with an increasing flow depth(P=0.008) or Reynolds number(P=0.002) in the sediment-laden flow. The Wr/Wi values followed a power function decrease with increasing friction factor or shear stress in the sediment-laden flow, indicating that friction factor is the best hydraulic parameter for prediction of soil aggregate abrasion under different sediment load conditions. The information regarding the soil aggregate abrasion under various sediment load conditions can facilitate soil process-based erosion modeling.  相似文献