• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Optimized operation of cascade reservoirs on Wujiang River during 2009-2010 drought in southwest China

    2013-06-22 13:25:24XinSUISainanWUWengenLIAOLanJIATiantianJINXueZHANG
    Water Science and Engineering 2013年3期

    Xin SUI*, Sai-nan WU, Wen-gen LIAO, Lan JIA, Tian-tian JIN, Xue ZHANG

    1. National Research Center for Sustainable Hydropower Development, China Institute of Water Resources and Hydropower Research, Beijing 100038, P. R. China

    2. Guizhou Wujiang Hydropower Development Co., Ltd., Guiyang 550002, P. R. China

    Optimized operation of cascade reservoirs on Wujiang River during 2009-2010 drought in southwest China

    Xin SUI*1, Sai-nan WU1, Wen-gen LIAO1, Lan JIA2, Tian-tian JIN1, Xue ZHANG2

    1. National Research Center for Sustainable Hydropower Development, China Institute of Water Resources and Hydropower Research, Beijing 100038, P. R. China

    2. Guizhou Wujiang Hydropower Development Co., Ltd., Guiyang 550002, P. R. China

    The effects of optimized operation principles implemented at reservoirs on the Wujiang River in southwest China between September 2009 and April 2010 under drought conditions were analyzed based on operational data collected from the Guizhou Wujiang Hydropower Development Co., Ltd. A set of linear regression equations was developed to identify the key factors impacting the electric power generation at reservoirs. A 59% reduction in the inflow discharge at the Hongjiadu Reservoir led to a decrease of only 38% in the total electric power generation at the Hongjiadu, Dongfeng, Suofengying, and Wujiangdu reservoirs on the Wujiang River, indicating that optimized operation can play an important role in drought management. The water level and the amount of other water inputs at the Hongjiadu Reservoir and the outflow discharge at all of the reservoirs except the Wujiangdu Reservoir were key factors affecting the total electric power generation at reservoirs on the Wujiang River under optimized operation.

    southwest China drought; Wujiang River; cascade reservoir; optimized operation

    1 Introduction

    Weather events such as extreme variations in temperature, precipitation, and wind have recently increased in frequency and intensity (Bolin 2003; Hansen et al. 2005; Qin et al. 2007; RCC 2008; Chen and Fan 2010). For example, Guizhou Province suffered its worst drought in the last 80 years between September 2009 and April 2010, while sequential autumn, winter, and spring droughts simultaneously occurred in five other provinces in southwest China (Shao et al. 2008).

    Decreases of precipitation and inflow caused by extreme weather events have a profound impact on the operation of cascade reservoirs. There have been many studies of reservoir operation in response to abnormal weather, most investigating the influence of precipitation (Xia et al. 2008a, 2008b), runoff (Shao et al. 2008), and inflow changes (Mirza 2009) caused by climate change. However, there have been few studies of the optimized operation ofcascade reservoirs in response to extreme weather.

    In this paper, we discuss the development of optimized operation principles and their effects on the operation of reservoirs on the Wujiang River during the drought between September 2009 and April 2010. A set of linear regression equations was developed to identify the key factors impacting the electric power generation at the cascade reservoirs. The conclusions of the study may provide useful information for decision makers attempting to implement optimized operation of cascade reservoirs to address climate change effects.

    2 Cascade hydropower stations on Wujiang River in Guizhou Province

    The Wujiang River, with a length of 1 037 km and a natural head of 2 123.5 m, flows through Guizhou Province and is the largest tributary on the south bank of the upper reaches of the Yangtze River. It is one of the twelve largest sources of hydropower in China, with hydropower reserves totaling 9.785 × 106kW. The Guizhou Wujiang Hydropower Development Co., Ltd. is the first watershed hydropower development company in China, and is also the first case of watershed cascade hydropower station construction and integrated development implemented by the State Council in China. The company manages seven hydropower stations in Guizhou Province, including the Hongjiadu, Dongfeng, Suofengying, Wujiangdu, Goupitan, Silin, and Shatuo reservoirs, with a total of hydropower reserve of 8.305 × 106kW. The distribution and main technical parameters of the cascade hydropower stations are shown in Fig. 1 and Table 1, respectively.

    Fig. 1 Map of cascade hydropower stations on Wujiang River

    Table 1 Main technical parameters for cascade hydropower stations on Wujiang River

    3 Optimized operation principles adopted at hydropower stations under drought conditions

    In terms of water input, electric power demand, and reservoir operation, the principles adopted at the hydropower stations on the Wujiang River to address the 2009 to 2010 drought conditions include:

    (1) For ecological reasons, the Silin Reservoir was controlled to maintain the flow rate of at least 195 m3/s in the lower reaches whenever it is possible.

    (2) Because of the low water input and increasing local demand for electric power, the hydropower stations generated substantially more electric power than projected power levels, and operation of the reservoirs focused on the primary mission of guaranteeing emergency availability during peak periods with minimal voltage and frequency disturbance.

    (3) The Hongjiadu Reservoir, as the leading reservoir, produced more electricity and compensated for reduced inflow at the lower reservoirs in order to maintain them at high water levels, reducing the rate of water consumption and improving the water utilization rate. For example, the water level at the Dongfeng Reservoir increased from 945 m in the middle September to 960 m in middle October in 2009. As a result, the rate of water consumption for electric power generation at the Dongfeng Reservoir decreased from 4.10 to 3.60 m3/(kW·h).

    (4) In November and December 2009, the water level at the Goupitan Reservoir was adjusted in combination with the upstream and downstream reservoirs. The water level at the Goupitan Reservoir was decreased as part of the overall implementation of the operation plan.

    (5) The Hongjiadu and Goupitan reservoirs were maintained at high water levels and reduced electrical output at the end of 2010 in order to improve operation of the cascade reservoirs and reduce the risk of lower water input.

    4 Analysis of cascade reservoir operation during drought in 2009-2010

    4.1 Rainfall and other water inputs to Wujiang River Basin

    From September 2009 to April 2010, rainfall at regional reservoirs was 35% to 65% lessthan that in the prior year. The lack of rainfall was particularly serious at the Hongjiadu Dongfeng, and Suofengying reservoirs (Table 2). In addition, the total amount of other water inputs to the Wujiang River Basin from September 2009 to April 2010 was at least 54% lower than that of the annual average of the same period from 1952 to 2007, and was the fifth lowest value over the past 70 years of historical records (Table 3).

    Table 2 Surface rainfall in Wujiang River Basin from September 2009 to April 2010

    Table 3 Other water inputs to Wujiang River Basin from September 2009 to April 2010

    4.2 Inflow discharge at reservoirs

    During the drought from September 2009 to April 2010, the average inflow discharge at each reservoir substantially decreased. The greatest decrease occurred at the Hongjiadu Reservoir (59%), and the smallest decrease was at the Silin Reservoir (18%) (Table 4). The other reservoirs experienced decreases of as much as 40% compared to the average during the same period of 2005-2008. The smallest decrease at the Silin Reservoir is related to ecological flow protection measures implemented there during the optimized operation.

    Fig. 2 shows the monthly average inflow discharge at each reservoir. The inflow discharge at the Silin Reservoir was relatively steady due to flow control at the Hongjiadu Reservoir. The inflow discharge at each reservoir was lower from January to April than from September to December due to the increased rainfall during the wet season from May to October.

    Table 4 Inflow discharges at reservoirs from September 2009 to April 2010

    Fig. 2 Comparison of monthly average inflow discharges at reservoirs from September 2009 to April 2010 with averages from September 2005 to April 2008

    4.3 Outflow discharge at reservoirs

    During the drought from September 2009 to April 2010, the average outflow discharge at each reservoir substantially decreased, and four reservoirs experienced nearly 40% decreases compared to the averages for the same period of 2005-2008 (Table 5).

    Table 5 Outflow discharges at reservoirs from September 2009 to April 2010

    4.4 Water level at reservoirs

    The average water level at each reservoir during the drought from September 2009 to April 2010 was lower than the average of the same period of 2005-2008, with the greatest reduction occurring at the Hongjiadu Reservoir (12.99 m) (Table 6). The monthly average water level at each reservoir from September 2009 to April 2010 and the averages from 2005 to 2008 are plotted in Fig. 3.

    Table 6 Average water levels at reservoirs from September 2009 to April 2010

    Fig. 3 Comparison of monthly average water levels at reservoirs from September 2009 to April 2010 with averages from September 2005 to April 2008

    4.5 Electric power generation

    Table 7 provides summaries of the electric power generation at the Hongjiadu, Dongfeng, Suofengying, and Wujiangdu reservoirs from September 2009 to April 2010, and Fig. 4 shows the monthly electric power generation at four reservoirs. While the inflow discharge at the Hongjiadu Reservoir decreased by 59%, the total electric power generation at the four reservoirs decreased by only 38% compared with the average of the same period of 2005-2008. The optimized operation at the Hongjiadu Reservoir increased the water levels at reservoirs in the lower reaches, which reduced the impact on the total electric power generation.

    Table 7 Electric power generation at reservoirs from September 2009 to April 2010

    Fig. 4 Comparison of monthly electric power generation at reservoirs

    5 Analysis of factors influencing electric power generation during drought management in 2009-2010

    The operation of cascade reservoirs is affected by many factors, including operation principles, watershed weather forecasts, past and present rainfalls, 24-hour regional inflow discharge predictions, electric power demand, water level, generating set conditions, and gate operational conditions (Cheng et al. 2008; Wang et al. 2009). In general, cascade hydropower operational schemes are formulated using a set of complex calculations, and a set of simplified fitted models are used to improve management effectiveness.

    Multiple linear stepwise regression was applied using the Statistical Program for Social Sciences (SPSS) software package to identify the impacts of different variables and different stations on the total electric power generation. The stepwise method and the tools for collinearity in SPSS were used during the simulation process to reduce the effects of multicollinearity between independent variables. The total weekly electric power generation (Y)at the reservoirs on the Wujiang River from September 2009 to April 2010 was selected as the dependent variable, and the quantity of water available at the end of a month (Q), the water level(L), the amount of other water inputs (C), and the inflow discharge (C1) and outflow discharge (C2) at each reservoir were used as independent variables, respectively. Table 8 provides the regression equations for the total electric power generation at reservoirs on the Wujiang River from September 2009 to April 2010 based on the variables of all reservoirs.

    Each of the regression equation was subjected to statistical correlation coefficient testing andF-testing. According to the adjustedR2of regressions 1 through 5, the relative influence of each variable on the total electric power generation was ordered (from high to low): the outflow discharge (0.999), the inflow discharge (0.987), the quantity of water available at the end of a month (0.709), the amount of other water inputs (0.662), and the water level (0.652).

    Table 8 Regression equations for total electric power generation at reservoirs on Wujiang River from September 2009 to April 2010 based on variables of all reservoirs

    The water level and the amount of other water inputs at the Hongjiadu Reservoir (as the primary reservoir) have obvious effects on the total electric power generation according to regression equations 1 and 3 (Table 8). Accordingly, the Hongjiadu Reservoir was maintained at a high water level after 2010 in order to improve the operation of the cascade reservoirs and reduce the impact of lower water flow rates.

    We also developed a set of linear regression equations for the total electric power generation at reservoirs on the Wujiang River based on the variables of each reservoir, as shown in Table 9. It indicated that the outflow discharge was the key factor impacting the total electric power generation at all of the reservoirs except at the Wujiangdu Reservoir, at which the key factor was the inflow discharge.

    Table 9 Regression equations for total electric power generation at reservoirs on Wujiang River from September 2009 to April 2010 based on variables of each reservoir

    6 Conclusions

    (1) The effects of optimized operation of cascade reservoirs on the Wujiang River in addressing the drought in southwest China are profound. During the drought from September 2009 to April 2010, the inflow discharge at the Hongjiadu Reservoir experienced a year-to-year decrease of 59%, while the inflow discharge at the Silin Reservoir decreased by only 18%, and the total electric power generation at the Hongjiadu, Dongfeng, Suofengying, and Wujiangdu reservoirs on the Wujiang River decreased by only 38%.

    (2) Among cascade reservoirs, the water level and the amount of other water inputs at the Hongjiadu Reservoir and the outflow discharge at all of the reservoirs except the Wujiangdu Reservoir were key factors affecting the total electric power generation at reservoirs on the Wujiang River under optimized operation.

    Bolin, B. 2003. Climate, knowledge and understanding, necessity for action in conditions ancertainness.Proceedings of World Conference on Climate Change, 9-13.

    Chen, H. B., and Fan, X. H. 2010. Some extreme events of weather, climate and related phenomena in 2009.Climatic and Environmental Research, 15(3), 322-336. (in Chinese)

    Cheng, C. T., Wang, W. C., Xu, D. M., and Chau, K. W. 2008. Optimizing hydropower reservoir operation using hybrid genetic algorithm and chaos.Water Resources Management, 22(7), 895-909. [doi: 10.1007/s11269-007-9200-1]

    Hansen, J., Nazarenko, L., Ruedy, R., Sato, M., Willis, J., Del Genio, A., Koch, D., Lacis, A., Lo, K., Menon, S., Novakov, T., Perlwitz, J., Russell, G., Schmidt, G. A., and Tausnev, N. 2005. Earth’s energy imbalance: Confirmation and implications.Science, 308(5727), 1431-1435. [doi:10.1126/ science.1110252]

    Mirza, M. M. Q. 2009. The impact of climate change on hydropower.Express Water Resources and Hydropower Information, 30(2), 9-11.

    Qin, D. H., Chen, Z. L., Luo, Y., Ding, Y. H., Dai, X. S., Ren, J. W., Zhai, P. M, Zhang, X. Y., Zhao, Z. C., Zhang, D. E., Gao, X. J., and Shen, Y. P. 2007. Updated understanding of climate change sciences.Advances in Climate Change Research, 3(2), 63-73. (in Chinese)

    Research Center for Climate Change, the Ministry of Water Resources of China (RCC). 2008. Introduction of IPCC reports.China Water Resources, (2), 38-40. (in Chinese) [doi:10.3969/j.issn.1000-1123. 2008.02.012]

    Shao, C., Shen, Y. P., and Zhang, J. 2008. Recently progress in climate change impact on water cycles of cold regions.Journal of Glaciology and Geocryology, 30(1), 72-80. (in Chinese)

    Wang, W. C., Chau, K. W., Cheng, C. T., and Qiu, L. 2009. A comparison of performance of several artificial intelligence methods for forecasting monthly discharge time series.Journal of Hydrology, 374(3-4), 294-306. [doi:10.1016/j.jhydrol.2009.06.019]

    Xia, J., Li, L., Yan, M. C., and Chu, J. T. 2008a. Impacts of climate change on water resource of Miyun Reservoir and adaptation managements.Advances in Climate Change Research, 4(6), 319-323. (in Chinese)

    Xia, J., Thomas, T., Ren, G. Y., Cheng, X. T., Wang, J. X., Wang, Z. J., Yan, M. C., Liu, X. J., and Ian, H. 2008b. Potential impacts of climate change on water resources in China: Screening for adaptation and management.Advances in Climate Change Research, 4(4), 215-219. (in Chinese)

    (Edited by Ye SHI)

    This work was supported by the National Natural Science Foundation of China (Grant No. 51109229).

    *Corresponding author (e-mail:suixin@iwhr.com)

    Apr. 11, 2012; accepted Nov. 15, 2012

    a级片在线免费高清观看视频| 国产精品偷伦视频观看了| 丁香六月天网| 91成年电影在线观看| 国产成人精品在线电影| 青草久久国产| 精品欧美一区二区三区在线| 国产1区2区3区精品| 日韩一区二区三区影片| 亚洲精品乱久久久久久| 在线av久久热| 丝袜美足系列| 日韩中文字幕欧美一区二区| 午夜福利,免费看| 日韩视频一区二区在线观看| 日本wwww免费看| 精品国产一区二区久久| 在线观看免费高清a一片| 一二三四在线观看免费中文在| 久久久精品区二区三区| 亚洲精品一二三| 亚洲av日韩在线播放| 日韩人妻精品一区2区三区| 亚洲成国产人片在线观看| 午夜福利视频精品| 午夜视频精品福利| 亚洲成人国产一区在线观看| 嫁个100分男人电影在线观看| av网站在线播放免费| 女人爽到高潮嗷嗷叫在线视频| 美女视频免费永久观看网站| 中文字幕人妻丝袜一区二区| 国产欧美日韩一区二区精品| 怎么达到女性高潮| 999久久久精品免费观看国产| 国产不卡一卡二| 亚洲性夜色夜夜综合| 女警被强在线播放| 少妇猛男粗大的猛烈进出视频| 国产亚洲一区二区精品| 久久久欧美国产精品| 国产福利在线免费观看视频| 亚洲综合色网址| 一本大道久久a久久精品| 99久久人妻综合| 19禁男女啪啪无遮挡网站| 国产黄频视频在线观看| 最近最新中文字幕大全电影3 | 看免费av毛片| 狠狠精品人妻久久久久久综合| 人人妻人人爽人人添夜夜欢视频| 成人手机av| 国产aⅴ精品一区二区三区波| 欧美精品亚洲一区二区| 精品一品国产午夜福利视频| 亚洲精品自拍成人| 国产日韩一区二区三区精品不卡| 999精品在线视频| 国产精品免费一区二区三区在线 | 久久性视频一级片| 精品国内亚洲2022精品成人 | 18禁观看日本| 99国产综合亚洲精品| 一区二区av电影网| 免费一级毛片在线播放高清视频 | 日韩中文字幕视频在线看片| 成年人午夜在线观看视频| 国产一区有黄有色的免费视频| 成人亚洲精品一区在线观看| 欧美黄色淫秽网站| 一边摸一边抽搐一进一出视频| 久久久国产欧美日韩av| 精品国产乱码久久久久久男人| aaaaa片日本免费| 99精品在免费线老司机午夜| 97在线人人人人妻| 久久中文字幕一级| 久久久久久亚洲精品国产蜜桃av| 欧美 亚洲 国产 日韩一| 免费在线观看影片大全网站| 啦啦啦 在线观看视频| 久久性视频一级片| 亚洲色图综合在线观看| 国产深夜福利视频在线观看| 亚洲精品美女久久av网站| 欧美精品一区二区免费开放| 亚洲精品久久午夜乱码| www.自偷自拍.com| 精品国产乱码久久久久久男人| 国产成人免费观看mmmm| 国产亚洲精品一区二区www | 国产在线视频一区二区| 黄片大片在线免费观看| 免费在线观看日本一区| 精品人妻1区二区| 日韩精品免费视频一区二区三区| 国产精品成人在线| 18禁裸乳无遮挡动漫免费视频| 99热国产这里只有精品6| 夜夜爽天天搞| 午夜老司机福利片| 精品国产乱子伦一区二区三区| 在线观看www视频免费| 亚洲男人天堂网一区| 亚洲一区二区三区欧美精品| 久久影院123| 久久久精品区二区三区| 啦啦啦 在线观看视频| 国产欧美日韩综合在线一区二区| 人人妻人人添人人爽欧美一区卜| 大型黄色视频在线免费观看| 天堂中文最新版在线下载| 亚洲人成伊人成综合网2020| 中文字幕精品免费在线观看视频| 成人av一区二区三区在线看| 国产av精品麻豆| 国产97色在线日韩免费| 黄色视频在线播放观看不卡| av在线播放免费不卡| 午夜福利免费观看在线| 国产区一区二久久| 亚洲精品成人av观看孕妇| 亚洲成av片中文字幕在线观看| 免费在线观看黄色视频的| 黑人操中国人逼视频| 精品人妻1区二区| 狠狠婷婷综合久久久久久88av| 精品久久蜜臀av无| 亚洲五月色婷婷综合| 日韩欧美三级三区| aaaaa片日本免费| 欧美精品啪啪一区二区三区| 另类亚洲欧美激情| 亚洲熟女精品中文字幕| 真人做人爱边吃奶动态| 国产又色又爽无遮挡免费看| 亚洲一卡2卡3卡4卡5卡精品中文| 我要看黄色一级片免费的| 国产不卡一卡二| 高清毛片免费观看视频网站 | 国产成人影院久久av| 老鸭窝网址在线观看| 精品一区二区三区四区五区乱码| 老司机在亚洲福利影院| 18禁国产床啪视频网站| 日韩一卡2卡3卡4卡2021年| 99九九在线精品视频| 午夜福利欧美成人| 制服诱惑二区| 欧美人与性动交α欧美软件| 日韩欧美三级三区| 国产成人欧美在线观看 | 少妇被粗大的猛进出69影院| 人人妻人人澡人人看| 成人永久免费在线观看视频 | xxxhd国产人妻xxx| 亚洲欧美色中文字幕在线| 亚洲国产欧美一区二区综合| 一级毛片精品| avwww免费| 国产黄频视频在线观看| 午夜福利视频精品| 久久精品国产亚洲av香蕉五月 | 亚洲色图综合在线观看| 久久狼人影院| 狠狠狠狠99中文字幕| 99久久精品国产亚洲精品| 色播在线永久视频| 国产精品久久久人人做人人爽| 欧美乱妇无乱码| 亚洲成人手机| 欧美变态另类bdsm刘玥| 一区二区av电影网| 亚洲中文字幕日韩| 中文字幕另类日韩欧美亚洲嫩草| 淫妇啪啪啪对白视频| 99久久人妻综合| 69av精品久久久久久 | 日韩视频一区二区在线观看| 久久国产精品人妻蜜桃| 男女午夜视频在线观看| 汤姆久久久久久久影院中文字幕| 亚洲av成人一区二区三| 亚洲,欧美精品.| 三级毛片av免费| 在线 av 中文字幕| videosex国产| 欧美大码av| 另类精品久久| 国产欧美日韩一区二区三| 91av网站免费观看| 免费人妻精品一区二区三区视频| 色婷婷av一区二区三区视频| 久久人人爽av亚洲精品天堂| 一边摸一边抽搐一进一出视频| videos熟女内射| 久热这里只有精品99| 国产野战对白在线观看| 欧美日韩黄片免| 亚洲成人免费av在线播放| 深夜精品福利| 欧美在线一区亚洲| 777米奇影视久久| av不卡在线播放| 国产成人系列免费观看| 免费观看人在逋| 99久久精品国产亚洲精品| 久久久久久久久免费视频了| 黄色视频不卡| 极品人妻少妇av视频| www.熟女人妻精品国产| 手机成人av网站| 久久久欧美国产精品| 欧美精品一区二区免费开放| 一级毛片精品| 精品一区二区三区视频在线观看免费 | av一本久久久久| 脱女人内裤的视频| 国产精品一区二区精品视频观看| 悠悠久久av| 国产精品久久久人人做人人爽| 91av网站免费观看| 国产av又大| av又黄又爽大尺度在线免费看| 热re99久久国产66热| 午夜两性在线视频| 久久精品国产亚洲av香蕉五月 | 久久中文看片网| 91av网站免费观看| 电影成人av| 久久久久国产一级毛片高清牌| 999久久久精品免费观看国产| 亚洲九九香蕉| 日日夜夜操网爽| 一区福利在线观看| 两人在一起打扑克的视频| 午夜两性在线视频| 交换朋友夫妻互换小说| 一本综合久久免费| 90打野战视频偷拍视频| 久久99热这里只频精品6学生| 男女无遮挡免费网站观看| 国产成人av教育| 亚洲三区欧美一区| 亚洲精华国产精华精| 亚洲午夜理论影院| 国产精品二区激情视频| 777米奇影视久久| 成人特级黄色片久久久久久久 | 黑人操中国人逼视频| 免费在线观看完整版高清| 精品欧美一区二区三区在线| videos熟女内射| 国产欧美日韩一区二区精品| 日本黄色视频三级网站网址 | 成人国语在线视频| 久久久久久久大尺度免费视频| 久久天躁狠狠躁夜夜2o2o| 亚洲欧美一区二区三区久久| videosex国产| 日本av手机在线免费观看| 午夜福利乱码中文字幕| 少妇的丰满在线观看| 亚洲精品在线美女| a在线观看视频网站| 久久精品国产综合久久久| 亚洲久久久国产精品| 国产成人啪精品午夜网站| 午夜免费成人在线视频| 99香蕉大伊视频| 又紧又爽又黄一区二区| 精品国内亚洲2022精品成人 | 午夜福利视频在线观看免费| 国产一区二区在线观看av| 日本黄色视频三级网站网址 | av网站在线播放免费| 日韩制服丝袜自拍偷拍| 后天国语完整版免费观看| 老熟妇乱子伦视频在线观看| 亚洲七黄色美女视频| 大片免费播放器 马上看| 中文字幕人妻丝袜一区二区| 9色porny在线观看| 欧美黑人精品巨大| 可以免费在线观看a视频的电影网站| 天天躁夜夜躁狠狠躁躁| 欧美成狂野欧美在线观看| 曰老女人黄片| 天天操日日干夜夜撸| 国产成人精品久久二区二区免费| 亚洲精品国产精品久久久不卡| 搡老乐熟女国产| 在线观看人妻少妇| 成人国产av品久久久| av不卡在线播放| 人人妻,人人澡人人爽秒播| 高清欧美精品videossex| 亚洲专区中文字幕在线| 天堂中文最新版在线下载| 精品第一国产精品| 免费看a级黄色片| 在线看a的网站| 久久国产精品人妻蜜桃| 欧美日韩亚洲高清精品| 久久中文字幕人妻熟女| 国产精品亚洲av一区麻豆| www日本在线高清视频| 国产xxxxx性猛交| 大香蕉久久成人网| 一级毛片精品| 97在线人人人人妻| 中文字幕人妻丝袜制服| 一级片'在线观看视频| 9热在线视频观看99| 在线永久观看黄色视频| 中亚洲国语对白在线视频| 黑人欧美特级aaaaaa片| 久久久久久久大尺度免费视频| 91成年电影在线观看| 操美女的视频在线观看| 欧美亚洲日本最大视频资源| 欧美精品一区二区免费开放| 亚洲精品中文字幕在线视频| 国产精品偷伦视频观看了| 亚洲专区国产一区二区| 最新的欧美精品一区二区| 欧美精品亚洲一区二区| 1024视频免费在线观看| 欧美成人午夜精品| a在线观看视频网站| 久热爱精品视频在线9| 纵有疾风起免费观看全集完整版| 下体分泌物呈黄色| 久久免费观看电影| 国产日韩欧美视频二区| 中文欧美无线码| 女同久久另类99精品国产91| 一区二区三区精品91| 黄色视频在线播放观看不卡| 日韩人妻精品一区2区三区| 国产精品久久久久久精品电影小说| 99国产综合亚洲精品| 午夜日韩欧美国产| 成在线人永久免费视频| 女人爽到高潮嗷嗷叫在线视频| 久久久国产精品麻豆| 一级毛片女人18水好多| 国产一区二区三区综合在线观看| 精品少妇久久久久久888优播| 欧美老熟妇乱子伦牲交| 久久热在线av| 欧美黑人欧美精品刺激| 人人妻人人添人人爽欧美一区卜| 在线天堂中文资源库| 免费在线观看日本一区| 女性生殖器流出的白浆| 精品国产国语对白av| 亚洲av日韩精品久久久久久密| 日本av手机在线免费观看| 国产不卡av网站在线观看| 夫妻午夜视频| 欧美激情 高清一区二区三区| 91大片在线观看| 国产免费av片在线观看野外av| 免费久久久久久久精品成人欧美视频| 久久狼人影院| 亚洲精品国产色婷婷电影| 91成人精品电影| 亚洲熟女精品中文字幕| 亚洲一区中文字幕在线| 久久亚洲精品不卡| 夜夜夜夜夜久久久久| 一区二区三区激情视频| 大陆偷拍与自拍| 天堂8中文在线网| 久久精品熟女亚洲av麻豆精品| 国产熟女午夜一区二区三区| 两性午夜刺激爽爽歪歪视频在线观看 | 纯流量卡能插随身wifi吗| 免费观看av网站的网址| 久久国产精品人妻蜜桃| 搡老岳熟女国产| 99精品久久久久人妻精品| 老熟妇乱子伦视频在线观看| 国产免费现黄频在线看| 黄色丝袜av网址大全| 欧美av亚洲av综合av国产av| 久久精品亚洲av国产电影网| 老司机亚洲免费影院| 欧美日韩亚洲综合一区二区三区_| 精品国内亚洲2022精品成人 | 国产男靠女视频免费网站| 一进一出抽搐动态| 99国产极品粉嫩在线观看| 国产一区二区在线观看av| 精品国产一区二区久久| 激情视频va一区二区三区| 最近最新免费中文字幕在线| 国产精品1区2区在线观看. | 欧美成狂野欧美在线观看| 老汉色∧v一级毛片| 亚洲熟女精品中文字幕| 黑人巨大精品欧美一区二区蜜桃| 性少妇av在线| 欧美在线黄色| 在线播放国产精品三级| 一二三四社区在线视频社区8| av天堂久久9| 欧美老熟妇乱子伦牲交| 日日爽夜夜爽网站| 老司机影院毛片| 又黄又粗又硬又大视频| cao死你这个sao货| 在线观看免费视频日本深夜| tocl精华| 日韩欧美国产一区二区入口| 中文字幕色久视频| 精品一区二区三卡| 搡老乐熟女国产| www.999成人在线观看| 精品国内亚洲2022精品成人 | 午夜日韩欧美国产| 国产免费福利视频在线观看| 一边摸一边抽搐一进一出视频| 久久精品91无色码中文字幕| 老汉色∧v一级毛片| 精品熟女少妇八av免费久了| 999久久久国产精品视频| aaaaa片日本免费| 国产精品久久久av美女十八| www.熟女人妻精品国产| 国产一区二区三区综合在线观看| 欧美日韩国产mv在线观看视频| 男女之事视频高清在线观看| 又紧又爽又黄一区二区| 最黄视频免费看| 国产男靠女视频免费网站| 大码成人一级视频| a级片在线免费高清观看视频| 免费在线观看日本一区| 丝袜美腿诱惑在线| 国产精品一区二区精品视频观看| 如日韩欧美国产精品一区二区三区| 欧美 日韩 精品 国产| 菩萨蛮人人尽说江南好唐韦庄| 精品亚洲成国产av| 黄色丝袜av网址大全| 亚洲精品美女久久久久99蜜臀| 国产成人免费无遮挡视频| 香蕉丝袜av| 亚洲色图av天堂| 十八禁人妻一区二区| 黄色 视频免费看| 日韩有码中文字幕| 国产又爽黄色视频| av天堂久久9| 大香蕉久久网| 欧美精品啪啪一区二区三区| 大香蕉久久成人网| 99久久人妻综合| 一进一出好大好爽视频| 看免费av毛片| 中文字幕人妻丝袜制服| 亚洲五月色婷婷综合| 美女主播在线视频| 国产精品久久久av美女十八| 久久影院123| 成人免费观看视频高清| 欧美激情久久久久久爽电影 | 欧美+亚洲+日韩+国产| 成年女人毛片免费观看观看9 | 成人免费观看视频高清| 久久久久网色| 如日韩欧美国产精品一区二区三区| 伊人久久大香线蕉亚洲五| 少妇的丰满在线观看| 久久久欧美国产精品| 精品国内亚洲2022精品成人 | 男女之事视频高清在线观看| 女同久久另类99精品国产91| 午夜老司机福利片| 午夜福利乱码中文字幕| 亚洲色图综合在线观看| 国产亚洲精品久久久久5区| 亚洲精品成人av观看孕妇| 国产av又大| 国产亚洲精品第一综合不卡| 18禁裸乳无遮挡动漫免费视频| 久久精品aⅴ一区二区三区四区| 欧美大码av| 90打野战视频偷拍视频| 国产精品99久久99久久久不卡| 两性夫妻黄色片| 涩涩av久久男人的天堂| 搡老乐熟女国产| 90打野战视频偷拍视频| av免费在线观看网站| 欧美人与性动交α欧美精品济南到| 免费看a级黄色片| 欧美国产精品一级二级三级| 女人久久www免费人成看片| 夜夜骑夜夜射夜夜干| a级毛片在线看网站| 变态另类成人亚洲欧美熟女 | 在线播放国产精品三级| 一区福利在线观看| 婷婷丁香在线五月| 少妇精品久久久久久久| 免费不卡黄色视频| 亚洲 国产 在线| 黄色片一级片一级黄色片| 午夜视频精品福利| 久9热在线精品视频| 热re99久久精品国产66热6| 亚洲人成电影观看| 午夜两性在线视频| 一区二区三区精品91| 国产亚洲一区二区精品| 日本av免费视频播放| 国产一区二区三区视频了| 一区在线观看完整版| 午夜视频精品福利| 18禁黄网站禁片午夜丰满| 99久久人妻综合| e午夜精品久久久久久久| 欧美av亚洲av综合av国产av| 成年女人毛片免费观看观看9 | 每晚都被弄得嗷嗷叫到高潮| 别揉我奶头~嗯~啊~动态视频| 丝袜在线中文字幕| 国产国语露脸激情在线看| 97在线人人人人妻| 少妇的丰满在线观看| 久久精品国产亚洲av香蕉五月 | 97在线人人人人妻| 久久影院123| 丝袜美腿诱惑在线| 超碰97精品在线观看| 精品久久蜜臀av无| 久久久水蜜桃国产精品网| 老司机深夜福利视频在线观看| 中文欧美无线码| 天天影视国产精品| 亚洲精品av麻豆狂野| 母亲3免费完整高清在线观看| 久久久久久久国产电影| 亚洲avbb在线观看| videosex国产| 女同久久另类99精品国产91| 久久久久久亚洲精品国产蜜桃av| 欧美黑人欧美精品刺激| 久久久久网色| 三级毛片av免费| 国产精品国产av在线观看| 久久精品国产综合久久久| 嫁个100分男人电影在线观看| 精品亚洲成国产av| 久久人妻av系列| 天堂中文最新版在线下载| 12—13女人毛片做爰片一| 人妻久久中文字幕网| 久久久水蜜桃国产精品网| 欧美日韩av久久| 精品一区二区三区四区五区乱码| 久久中文看片网| 超碰成人久久| 日韩有码中文字幕| 久久久欧美国产精品| 一本久久精品| 波多野结衣一区麻豆| 在线观看免费视频网站a站| 日日摸夜夜添夜夜添小说| 男女边摸边吃奶| 新久久久久国产一级毛片| 精品一区二区三区av网在线观看 | 精品久久久精品久久久| tocl精华| 一区二区日韩欧美中文字幕| 丝袜美足系列| 欧美精品一区二区免费开放| 国产不卡一卡二| 精品卡一卡二卡四卡免费| 国产精品 国内视频| 免费看a级黄色片| 人人妻人人添人人爽欧美一区卜| 交换朋友夫妻互换小说| 精品亚洲乱码少妇综合久久| 青青草视频在线视频观看| 国产福利在线免费观看视频| 日韩制服丝袜自拍偷拍| 国产一区二区 视频在线| 国产福利在线免费观看视频| 日韩欧美国产一区二区入口| 黄片播放在线免费| 亚洲av欧美aⅴ国产| 免费看a级黄色片| 脱女人内裤的视频| 一边摸一边抽搐一进一小说 | 久久久久久久精品吃奶| 国产精品影院久久| 国产人伦9x9x在线观看| 亚洲精品中文字幕一二三四区 | 国产成人啪精品午夜网站| 极品教师在线免费播放| 免费在线观看影片大全网站| 成人18禁在线播放| 国产亚洲精品久久久久5区| 久久久久久久国产电影| 最近最新中文字幕大全电影3 | 精品熟女少妇八av免费久了| 久久天堂一区二区三区四区| 中文字幕精品免费在线观看视频| 日本一区二区免费在线视频| 国产精品国产av在线观看| 老司机亚洲免费影院|