Through an analysis of aquifer deformation machanism caused by groundwater pumping ,the seepage flow equation with considering adynamic unit is deduced in this paper,and the mathematical model for the effect of aquifer deformation caused by groundwater pumping upon seepage field is presented.

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Energy conversion, water level, distribution and variation of depression cones during artesian and pumping processes are analyzed.

從抽水設(shè)備作功、消耗能量的角度，分析了自流和抽水過(guò)程中的能量轉(zhuǎn)化国产一级AA片在线视频、水位與壓降漏斗的分布和變化規(guī)律国产在线91免费。

As power market reformation carries on, power grid is in difficult status at the aspects of modulating peak effectively, operating safely and stably and supplying power reliably. Pumped storage power station has an important effect on safe, stable and economical operation of power grid. Research on benefit's comprehensive evaluation and operation mode of pumped storage power station is the avant-courier and difficulty in the domain of technology economy and management, which has important theory research value and practical significance.

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The system is designed such that it can be operated by its own and has the advantage of fast ice making.

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The second kind of Fredholm integral equation of the single pile interacted with the point sink is obtained through the fundamental solutions.

利用圓形載荷和抽水井點(diǎn)的基本解得出了單樁和抽水井點(diǎn)相互作用時(shí)在時(shí)間域內(nèi)的第二類Fredholm積分方程。

Pumped storage unit works in turbine-generator mode or pump-motor mode, Monitoring and Control system is very complicated, and each Pumped Storage Power Station's generating capacity and geographic conditions have their own characteristics. Therefore, it is very important to design a reasonable monitoring and Speed control system before the pumped storage station has been builded.

抽水蓄能機(jī)組在水輪機(jī)-發(fā)電機(jī)和水泵-電動(dòng)機(jī)兩種模式下工作黄色网欧美，運(yùn)行工況多天天摸夜夜添添到高潮水汪汪，監(jiān)控與調(diào)速系統(tǒng)十分復(fù)雜，并且每個(gè)抽水蓄能電站的發(fā)電量及地理?xiàng)l件都存在一定的差異性日本va欧美大胆视频，因此在建設(shè)新的抽水蓄能電站時(shí)久久99精品久久久久久66，科學(xué)的設(shè)計(jì)抽水蓄能電站的監(jiān)控與調(diào)速系統(tǒng)是非常重要的工作。

By leading in peakload regulating ability coefficient f and pumped-storage groups of that of f equate to negative one in the electrical powre system,we get the constitution of power source of system,which is more economical.

抽水蓄能機(jī)組參與電力系統(tǒng)運(yùn)行的經(jīng)濟(jì)效益分析應(yīng)以整個(gè)電力系統(tǒng)為對(duì)象A片一区二区三区视频大全。文章提出以上確定加和抽水蓄能機(jī)組容量值的計(jì)算方法及經(jīng)濟(jì)效益分析方法久久久久久久精品九精品。

Results of estimation of effective parameters in heterogeneous show that: i Seff and Teff values evolve with time, as well as the principal directions of the transmissivity; ii Seff approaches the arithmetical mean of the field; iii Teff converges to its geometric mean at large time for the Gaussian random field we generated; and iv the averages of local T and S values within the cone of depression at early times differ from the Teff and Seff values.

研究結(jié)果在空間異質(zhì)性孔隙介質(zhì)有效參數(shù)的推估方法方面，顯示利用傳統(tǒng)抽水試驗(yàn)分析來(lái)估計(jì)有效參數(shù)時(shí)成人播放日韩在线播放AV，從長(zhǎng)時(shí)間的抽水試驗(yàn)分析所得的流通系數(shù)代表在抽水井有效半徑內(nèi)所有流通系數(shù)的某種平均值免费看黄色短片；此平均值與抽水井及觀測(cè)井附近的地質(zhì)有很大的關(guān)系，而且可能受到有效半徑內(nèi)地質(zhì)異質(zhì)性的影響淫荡视频网页，而儲(chǔ)蓄系數(shù)的估計(jì)值變異很大與抽水井與觀測(cè)井間地質(zhì)的儲(chǔ)蓄系數(shù)特性有關(guān)亚洲熟女偷窥综合网，特別是觀測(cè)井的位置。

As the complete characteristic curves of reversible pump turbine are often used to calculate the instantaneous parameters, this paper studies the characteristic curve and the wicket closure and opening law in pumped storage plants.Chapter 1 presents the importance and the necessity of this study and reviews the previous related research on hydraulic transient process and valve regulation in pumped storage plants.Chapter 2 analyzes the six collected characteristic curves of reversible pumped turbine and studies their diversification from the point of view of specific speed. The six collected discharge and moment curves with maximum efficiency have been fitted to piecewise continuous curves. This curve-fitting procedure is listed.Chapter 3 takes Liyang Pumped storage plant as an example and analyzes the effect of different characteristic curves on regulation guarantee parameters and the variety of its trochoid during the same operation status.Chapter 4 takes three pumped storage plants with different heads as examples and studies the characteristic of coordinated closure with wicket gate and ball valve and its effect on dynamic pressure in the spiral case, inlet pressure in the draft tube and the rise of rotating speed.Chapter 5 summarizes this paper and point out what should be done in the future research.

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The procedure is applied in two projects:(1) Shanghai Huanqiu finance center tower foundation pit dewatering, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 149m, the horizontal flow barrier goes deep to 34m, the extraction wells are penetrated to 55m, the filters of the extraction wells are located between 34m to 55m, and the water level in the deep foundation pit is decreased to 26m under land surface, the result of 8 pumping wells optimization project is designed.(2) The forth subway of Dong Jia-du tunnel repair foundation pit dewatering in Shanghai, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 144.45m, the horizontal flow barrier goes deep to 65m, the extraction wells are penetrated to 60m, the filters of the extraction wells are located between 45m to 60m, and the water level in the deep foundation pit is decreased to 42.45m under land surface, then an optimization project is designed.

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