前湖排水渠卧龙山滑坡体稳定评价及治理

卧龙山滑坡体规模较大，将直接影响前湖排水渠的正常运行．根据现场勘察，查明滑坡成因机理，并进行稳定性评价，为滑坡的治理提供可靠的地质资料．     

湖北潜江市出高招出让渠堤产权"换资"修水渠

新华网湖北频道2005年12月28日消息,税费改革后,农村小型水利设施建设怎么办7潜江市使出高招．出让闲置渠堤产权让承包人造林发财,“换”出其资金开挖疏浚,保证沟渠畅通。到12月22日,潜江今年已“换”出民间资本1200万元,开挖疏浚渠道70多条。     

“治心”比“治水”更重要

春秋时期,楚围令尹孙叔散在苟陂县兴修了一条南北走向的水渠、水渠又宽又长．足以灌溉沿渠的万顷农田,百姓受益很大,都颂赞孙叔敢是爱民如子的好官,要为他树碑立传。可是水渠修成后,沿堤的农民就开始存旱季把庄稼种到堤岸边,有的甚至把农作物种到了堤坝内。等到雨季来临时渠水上涨,     

EXPERIMENTAL RESEARCH ON THE SHAPE CHARACTERS OF NATURAL AND VENTILATED SUPERCAVITATION

A series of projectile and water-tunnel experiments were conducted to investigate the shape characters of natural and ventilated supercavitation. It was found that the shape and dimensions of both the natural supercavitation and the ventilated supercavitation are similar through the comparison of them when the cavitation number is small and equal, and the contour of both the natural supercavitation and the ventilated supercavitation can be calculated effectively with the Savchenko formula. The gravity effect can induce the asymmetry of ventilated supercavitation, and the asymmetry is more apparent as the Froude number is smaller. The empirical formula for calculating the axial deformation of ventilated supercavitation was corrected and expanded based on experiment data. The evolution rules of both the natural supercavitation and the ventilated supercavitation were described, and the vortex frequency of natural cavitation was obtained. In addition, the hysteretic aspect was observed between the development and the fall process of ventilated cavitation.     

不同断面形式的灌渠过水流量分析

运用水力学中水渠流量计算方法,对7种不同断面类型的水渠进行数值模拟.比较相同的过水流量下各水渠的优点,得出在相同的过水流量条件下,U型水渠具有占地面积少的优点.数值模拟结果发现不同断面形式的水渠过水量与水位深度呈相关性.使用SPSS统计分析软件推算各类水渠的过水量与水位深度的拟合函数方程,其中梯形断面水渠与U形断面水渠的水流量与水位深度呈一次函数的线性相关,而其它断面水渠呈二次函数的曲线相关.     

农田混凝土水渠裂缝及控制

一、裂缝类型及原因1.沉陷裂缝。指由于开挖破基扰动或浸水造成地基不均匀、地基土质不均匀沉降造成的裂缝。在挖掘过程中,扰动坡基原状土造成坡基土的密实度达不到要求,使得回填的难度很大,均匀性较差,很难承受衬砌混凝土的压力,从而造成混凝土板沉陷扭曲、移位、甚至坍塌。     

水渠畅通人心亮

在保持党员先进性教育活动中,虎林市水务局注重结合自身职能特点,积极转变工作作风,加大为农服务力度,扎扎实实地把“党员受教育、群众得利益”的要求落到实处。水务局所属的石头河灌区位于虎林市杨岗镇境内,承担着杨岗镇5个村、1250户、1.77万亩水田的用水灌溉任务。自农村实行费税改革以来,村里取消了义务工,使灌区渠道面临淤泥堆积、无人清理的严峻局面,如不及时解决,将直接影响灌溉工程效益的发挥、农业增产和农民增收。     

溢洪道出水渠洪水标准

根据溢洪道各功能段不同防护对象的要求,阐明溢洪道出水渠洪水标准确定的原则与方法,以期降低其乃至整个溢洪道的工程造价。     

Numerical Model for Flow Motion with Vegetation

A set of governing equations for turbulent flows in vegetated area were derived with the assumption that vegetation is of straight and rigid cylinder. The effect of vegetation on flow motion was represented by additional inertial and drag forces. The new model was validated by available experimental data for open channel flows passing through vegetated areas with different vegetation size, density and distribution. Numerical results are in good agreement with the experimental data. Finally, the flow around a supposed isolated vegetated pile was simulated and the effects of vegetation density on the wake flow were discussed. It is found that the presence of vegetation, even at a very low density, has the pronounced influence on the dissipation of flow energy, both inside the vegetation domain and outside it in the wake flow region.