查询词典 water level

Because when a river overflows in a vast flood plain, a minute rise in the water level represents extremely large volume of water.

改进洪水预报、预报洪水路径和控制洪水的基本要求之一在于水位的精确测量。

Especially the anabranch water level is raisen great and the flow speed slow down obviously for holded up by the Yangtze River, and the rate of water eutrophication is raisen. The thesis chose the typical branch river, Xiaojiang river, to sample and research the eutrophication degree , and discover that the eutrophication of branch river are serious.

本论文主要选择了典型消落带断面，分析了浮游生物种类，并以典型流域——小江流域，对该流域的消落带水体的富营养化程度进行了调查、采样、监测和分析，并运用模糊数学理论建立了评价模型，对消落带水体的富营养化程度进行了评判，发现蓄水后长江支流富营养化现象较为严重。

The use of advanced water level control device, automatic water system.

利用先进的液位控制装置，自动控制供水系统。

When the stone put into the beaker that contains water, the water level in the beaker will rise.

当石头放入含水的烧杯，烧杯里的水位将上升。由于石头占去了水的空间，所以水位会上升。

But, in the real canal operation, the canal water surface will fluctuate because of outside disturbance, and there is measurement error in measuring water level. Whether or not the estimated state can substitute for the real state will results in the design issues of optimal observer.

问题是在实际的渠道运行中，渠道水体会由于受到外部因素的干扰而产生水面波动，水位测量仪器也存在观测误差，那么估计的水流状态能否替代真实的水流状态。

The theoretical model to reveal the mechanism of delayed gravity response is established on account of the effects of detention of water by capillarity and boundary friction in the unsaturated zone and elasticity of aquifer skeleton with falling of ground water level.

为揭示潜水延迟给水的机理，本文建立了考虑毛管滞水和弹性储量影响的潜水三维非稳定井流理论模型，并经实例验证。

But when we mine commensuration groundwater, the falling velocity water level and range of the deep hydrous stratum are bigger than the shallow hydrous stratum. And the quantity of subsidence is not obvious different. 2. Analyzing the relation between the stratum of groundwater and land subsidence, with the depth of aquifer bed increased, the proportion that the released water because of compressibility of strata possessed become bigger, and it cause land subsidence more serious. 3. The physical and mechanical properties and the consolidation state of stratum do not become better with the depth increased.

依据： ①一般情况下，随深度增加，地层的压缩性会渐下；但是开采同量的地下水，其水位下降的速率及幅度深部含水组比浅部含水组要大的多，两者引起的沉降量不会有明显的差别；②从地下水开采资源组成与地面沉降关系分析，含水层深度越深，其中的压密释水量所占的比例也越大，造成的地面沉降也越严重；③地层的物理力学性质及固结状态，随深度的增加，也不完全是越来越好。

The time-dependent Dirichlet boundary condition was used to describe the variation of water head during water level fluctuation.

模型的求解采用效率较高的积分有限差分法进行空间离散，并编制了全隐式联立求解的计算程序，通过变换主要变量，实现了饱和与非饱和的相互转变，采用随时间变化的Dirichlet边界条件精确模拟水位波动时的变水头边界条件。

Well water level ; Earth tide ; Well water bearing system

井水水位；固体潮；井－含水层系统

Then, transmission relationship between frequency for maximum flood discharge in a yearand frequency for every flood in this year was established. And based on the risk rate ofdynamic controlling reservoir water level in flood season defined by Prof. B.D Wang andmaximum entropy model of forecast error distribution, the definition of risk rates when usingflood forecast or combination of flood forecast and precipitation forecast to control limitwater level in flood season were difined. And their corresponded calculation methods weregiven as well in this dissertation.

在王本德教授对汛限水位动态控制风险率定义的基础上，结合预报误差分布的极大熵模型，通过分析年频率与次频率的转换关系，建立了利用洪水预报以及洪水预报和降雨预报联合应用动态控制水库汛限水位的风险率定义及其计算方法。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。