Shikoku is one – roles of dams in Yoshino River Comprehensive Development Project: Arrangements to realize one of Japan’s greatest water diversion plan and flood control effect of dams

2006 ◽  
pp. 39-46
Author(s):  
Yokito Sugimura
Keyword(s):  
Flood Control ◽  
Development Project ◽  
Water Diversion ◽  
Control Effect ◽  
Comprehensive Development

scholarly journals Research on Water Environment Regulation of Artificial Playground Lake Interconnected Yangtze River

2018 ◽  
Vol 15 (10) ◽  
pp. 2110 ◽  
Author(s):  
Weiwei Song ◽  
Xingqian Fu ◽  
Yong Pang ◽  
Dahao Song ◽  
Qing Xu ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Yangtze River ◽  
Flood Control ◽  
Numerical Models ◽  
Rapid Development ◽  
Control Level ◽  
Water Environment ◽  
Water Diversion ◽  
Coupled Models

With the rapid development of China, water pollution is still a serious problem despite implementation of control measures. Reasonable water environment management measures are very important for improving water quality and controlling eutrophication. In this study, the coupled models of hydrodynamics, water quality, and eutrophication were used to predict artificial Playground Lake water quality in the Zhenjiang, China. Recommended “unilateral” and “bilateral” river numerical models were constructed to simulate the water quality in the Playground Lake without or with water diversion by pump, sluice and push pump. Under “unilateral” and “bilateral” river layouts, total nitrogen and total phosphorus meet the landscape water requirement through water diversion. Tourist season in spring and summer and its suitable temperature result in heavier eutrophication, while winter is lighter. Under pumping condition, water quality and eutrophication of “unilateral” river is better than “bilateral” rivers. Under sluice diversion, the central landscape lake of “unilateral river” is not smooth, and water quality and eutrophication is inferior to the “bilateral”. When the water level exceeds the flood control level (4.1 m), priority 1 is launched to discharge water from the Playground Lake. During operation of playground, when water level is less than the minimum level (3.3 m), priority 2 is turned on for pumping diversion or sluice diversion to Playground Lake. After opening the Yangtze river diversion channel sluice, priority 3 is launched for sluice diversion to the Playground Lake. When the temperature is less than 15 °C, from 15 °C to 25 °C and higher than 25 °C, the water quality can be maintained for 15 days, 10 days and 7 days, respectively. Corresponding to the conditions of different priority levels, reasonable choices of scheduling measures under different conditions to improve the water quality and control eutrophication of the Playground Lake. This article is relevant for the environmental management of the artificial Playground Lake, and similar lakes elsewhere.

scholarly journals Foundational Study on Water Use and Flood Control Effect by the Large Scale Reservoir

2005 ◽  
Vol 49 ◽  
pp. 457-462 ◽  
Author(s):  
Taichi TEBAKARI ◽  
Kazuhiko FUKAMI ◽  
Chanchai SUVANPIMOL ◽  
Mamoru MIYAMOTO ◽  
Tadashi YAMADA
Keyword(s):  
Water Use ◽  
Flood Control ◽  
Large Scale ◽  
Control Effect

An Experimental Study on Flood Control Capability of Dry Dams Constructed in a Series

2015 ◽  
Vol 10 (3) ◽  
pp. 467-474 ◽  
Author(s):  
Hideo Oshikawa ◽  
◽  
Yuka Mito ◽  
Toshimitsu Komatsu ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Flood Control ◽  
Laboratory Experiments ◽  
Slide Gate ◽  
Reservoir Capacity ◽  
Control Effect ◽  
Flood Disasters ◽  
Control Capability ◽  
Cascade Method ◽  
Large Dam

The new Cascade concept of flood control is demonstrated in laboratory experiments in which upstream dams in a series of dams constructed along a river overflow from emergency spillways while the final downstream dam is required only to use its normal spillway and never do its emergency spillway. Multiple small dry dams lacking a slide gate in a normal spillway should be constructed in a series rather than as a single large dam to prevent flood disasters and to preserve the natural environment. Dry dams for flood control have recently been reviewed, planned, and built at sites in Japan. In this paper, we compare the Cascade method to conventional flood control in laboratory experiments conducted based on the condition that dams all have the same reservoir capacity. Results have shown that the Cascade method using multiple dry dams was considerably more effective than conventional flood control. Furthermore, the additional flood control effect of a dry dam equipped with closable and openable gate in its regular spillway was experimentally confirmed although there is no such kind of the gate on an ordinary dry dam. This new dry dam should be constructed in the river’s upper reaches away from the existing downstream storage dam needing still more its capacity for water utilization, thus ensuring the amount of water available by closing the regular spillway after the dry dam is filled to capacity. The flood control capacity of dams including the new dry dam is stronger than that of an ordinary storage dam thanks to the dry dam’s storage function.

Assessing the flood control effect of the existing and projected reservoirs in the middle amur basin by physically—based hydrological models

2015 ◽  
Vol 42 (5) ◽  
pp. 580-593 ◽  
Author(s):  
Yu. G. Motovilov ◽  
V. I. Danilov-Danilyan ◽  
E. V. Dod ◽  
A. S. Kalugin
Keyword(s):  
Flood Control ◽  
Hydrological Models ◽  
Amur Basin ◽  
Control Effect ◽  
Physically Based

Numerical Simulation of the Internal Flow of a New-Type Shaft Tubular Pumping System

2011 ◽  
Author(s):  
Honggeng Zhu ◽  
Longyang Dai ◽  
Rentian Zhang ◽  
Guoxian Zhu ◽  
Linbi Yao ◽  
...  
Keyword(s):  
Flood Control ◽  
Energy Performance ◽  
Structural Features ◽  
Water Diversion ◽  
Small Scale ◽  
Pumping Station ◽  
Pumping System ◽  
Pumping Stations ◽  
Low Head ◽  
New Type

The structural features of a pumping system will directly affect the investment of the pumping station and its pumping efficiency. In the design and construction of low head or extra-low head pumping stations, bulb tubular pumping system and shaft tubular pumping system are widely adopted. So far all the 5 large tubular pumping stations finished or under construction took the form of rear type bulb tubular pumping system (bulb is arranged inside the discharge passage) in China’s Eastern Route Project of South-to-North Water Diversion. However, front type shaft tubular pumping systems (shaft is arranged inside the suction box) are more widely used in city flood-control pumping stations, which are characteristic of large amounts and medium or small scale. To improve the reliability of city flood-control pumping stations, the authors have invented a new-type shaft tubular pumping system featuring shaft suction box, siphon-type discharge passage with vacuum breaker valve as the cutoff device, which is possessed of such advantages as simpler structure, reliable cutoff and better energy performance. Taking an real pumping station in Yancheng city of China as an example, the computational fluid dynamics method was adopted in this paper to simulate the three dimensional turbulent flow of a model new-type tubular pumping system (impeller diameter D = 0.3m, rotational speed n = 1100r/min and specific speed ns is about 1500) and predict its performance, to improve the pumping system efficiency through hydraulic design optimization. Computation results show that the efficiency of the new-type shaft tubular pumping system reached 56.0% when the design head and discharge are 1.15m and 0.326m3/s respectively, and up to 68.8% when the maximum head and relevant discharge are 1.95m and 0.296m3/s respectively, having more extensive foreground for low-head, especially extra-low-head city flood-control pumping stations.

scholarly journals Special Issue on Expectations for Upgrading Dams Under Operation

2018 ◽  
Vol 13 (4) ◽  
pp. 581-584
Author(s):  
Tetsuya Sumi ◽  
Makoto Nakatsugawa ◽  
Yoshikazu Yamaguchi
Keyword(s):  
Lake Biwa ◽  
Development Project ◽  
Special Issue ◽  
Reservoir Capacity ◽  
Sediment Deposits ◽  
Hoover Dam ◽  
Healthy State ◽  
The Us ◽  
Comprehensive Development ◽  
Effective Use

IntroductionThere are approximately 2,700 dams in Japan. Their total reservoir capacity is approximately 25 billion m3(BCM), far less than the 34.4 BCM of Hoover Dam in the US or the 39.3 BCM of the Three Gorges Dam in China. Lake Biwa, with a capacity of 27.5 BCM, which has recently been used for multiple purposes by the Lake Biwa Comprehensive Development Project, is equivalent in scale to such artificial lakes. On the other hand, dams in Japan that were constructed on mountain rivers with considerable sediment deposits are decreasing their capacity more rapidly than those constructed on continental rivers, so they require measures against deposition to maintain their long-term reservoir capacity. In addition, extreme weather phenomena (increased rainfall and drought intensity) under climate changes increase high demand for storage capacity of dams. In order to effectively use these dams as limited resources and to hand them over to the next generation in healthy state, continuous investment and development of maintenance technology are required. Recently, to promote this investment and development, “A vision for upgrading dams (effective use of existing dams to mitigate damage from frequent floods and droughts and to generate renewable energy)” was established by the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT) on June 27, 2017 [1]. This special issue is collecting the significance of the dam upgrading projects and important challenges from various aspects to be implemented.

scholarly journals Impacts of the emergency operation of the South-to-North Water Diversion Project’s eastern route on flooding and drainage in the water-receiving area: An empirical case from China

2018 ◽  
Author(s):  
Kun Wang ◽  
Zongzhi Wang ◽  
Kelin Liu ◽  
Liang Cheng ◽  
Lihui Wang ◽  
...  
Keyword(s):  
Flood Control ◽  
Integrated Management ◽  
Emergency Operation ◽  
Water Levels ◽  
Water Diversion ◽  
Lake Basin ◽  
Efficiency Coefficient ◽  
The South ◽  
Basin Scale ◽  
North Water

Abstract. The water levels of lakes along the eastern route of the South-to-North Water Diversion Project (ER-SNWDP) are expected to rise significantly and subsequently affect the process of flood control and drainage in those lake basins. However, few studies have focused on the impacts of interbasin water diversion on the flood control and drainage of water-receiving areas at the lake basin scale. Using MIKE software, this paper builds a coupled hydrodynamic model to address the existing literature gap on the impacts of interbasin water diversion on the process of flood control and drainage in a water-receiving lake basin, and it considers the many types of hydraulic structures in the model. First, a flood and waterlogging simulation model was constructed to simulate the interactions among the transferred water, waterlogging of the lakeside area surrounding Nansi Lake (NL), and water in NL and its tributaries. The ER-SNWDP was also considered in the model. Second, the model was calibrated and verified with measured data, and the results showed that the model is efficient and presents a Nash-Sutcliffe efficiency coefficient (NSE) between 0.65 and 0.99. Third, the process of flood and drainage in the lakeside area of NL was simulated under different water diversion and precipitation values. Finally, the impacts of emergency operations of the ER-SNWDP on flood control and waterlogging drainage in the lakeside area of NL were analyzed based on the results from the proposed model, and selected implications are presented for the integrated management of the interbasin water diversion and the affected lakes.

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