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Planning of guide lines of river regulation is an important evidence for river conservation and regulation as well as water front function maintenance and management. Studying the flood control guide lines of river regulation is of great significance to protect river ecosystem and settle water rights scientifically and rationally. In this paper, thelayout principles of guide lines of river regulation in Qingzhang River were examined and proved. Several guide lines of river regulation width control parameters such as flow per unit width, flow velocity and water level rising value were proposed. Taking the Qingzhang River as an example for further research, the layout principle of the flood control guide lines of river regulation was refined, and the specific control parameters of the flood control guide lines of river regulation were put forward based on the analysis and calculation of the hydrological data of the Qingzhang River, and the application analysis of the results was carried out. The results show that the proposed layout principles and control parameters of flood control guide lines of river regulation are suitable for Qingzhang River, and the flood control guide lines laid out of river regulation in this way are reasonable. [ABSTRACT FROM AUTHOR]

This paper analyzed the water and sediment characteristics and eroding effect on river of flood in 2018. The result shows that this flood has the characteristics including large volume of water, long duration and high flood peak, the dis-charge of the flood peak coming into and routing through the Ningxia and Inner Mongolia reach of the Upper Yellow River varies from 2 880 m³/s to 3 600 m³/s, among which wick flood plains in the reach from Sanhuhekou to Toudaoguai arc overflowcxL The flood effects the Ningxia-Inner Mongolia reach evidently, it has an obvious effect of " depositing on floodplain and eroding channel" in Bayangaole to Sanhuhekou reach. The scour efficiency of overbank flood is higher than that of non-overbank floord. After the flood, the same discharge water level of Bayangaole and Simhuhekon stations in Inner Mongolia reach drops 0.71 m and 0.47 m respectively and the bankfull discharge increases 500 m³/s and 320 m³/s respectively. [ABSTRACT FROM AUTHOR]

The Yellow River key reservoir projects bear on the big picture. The practices of planning, construction, operation and management of these key reservoir projects promote continually the deepening of the understanding of the governance of the Yellow River. Based on the planning and construction backgrounds of the Sanmenxia Reservoir and the Xiaolangdi Reservoir in the middle reaches of the Yellow River and their operation and management practices, this paper briefly reviewed the progress from practice to cognition to practice and cognition again, as well as the development and evolution of river harnessing thought through it. Based on the problems and challenges faced by the Yellow River management in the new era, this paper suggests to speed up the development of the Guxian key reservoir project. [ABSTRACT FROM AUTHOR]

The floods occurred in the lower reaches of the Yellow River has been the serious hidden danger for the Chinese nation. The flooding of the Yellow River and the shifting of river channel had posed a great threat to the life and property security of the people in the lower reaches. According to the record of historical literatures and combing of previous research results, this paper discussed the relationship between the river training works and the Yellow River floods in the Ming and Qing dynasties. The research shows that the river training works are obviously in response to the flood events in the Ming and Qing dynasties and there is a positive correlation between the river works and floods. The flood frequency of the Yellow River in the late Ming Dynasty is higher than that in the early period and the river training works also show a corresponding trend. In the early and middle Ming Dynasty, there are more frequent floods and more river engineering works in Henan area. In the late Ming Dynasty and Qing Dynasty, the flood occurred frequently in the area south of the lower reaches of the Yangtze River, the construction of river training works are also more frequent. The Yellow River floods have promoted the construction of river engineering works, which can effectively control the flood of the Yellow River. However, the most of the river works are built after burst or blocked, mainly belonging to post-disaster response types. [ABSTRACT FROM AUTHOR]

Predicting the future evolution of the flood according to the similar inlor^nation in historical rainstor^n and flood is an effective way to realize advance flood warning and prediction. This paper developed a multi-index similarity measure method for rainstor^n based on “ quantity” and “type” similarity indexes, the similarity index of rainstor^n distribution and the earth mover's distance (EMD) ； searched the similar rainstor^n process and its corresponding typical flood process in historical records and then scaled the typical flood process according to the ratio of rainfall amounts to achieve the advance waning and forecast of flood. The ideal rainstorm series generated from an actual rainstorm process were applied to validate the proposed approach, proving its rationality； and this paper used the method in Xinmiao Station of Kuye River, located in the middle Yellow- River. The results show that the proposed flood forecasting method based on rainfall similarity analysis is effective and feasible. [ABSTRACT FROM AUTHOR]

The paper analyzed the characteristics of channel and overbank flood, such as the bankfull discharge, runoff and sediment and the evolution rule of Xiaobeiganliu section of the Yellow River. It built the actual relationship of storage capacity to forecast the overbank flood based on the measuring data of the stage and cross-section. When the high sediment overbank flood happened, the runoff volume decreased and stored in the bottomland and the peak hydrograph was attenuating. The paper built the runoff and sediment detention model to forecast the high sediment overbank flood. The results show that the test qualified rate of 21 forecasted overbank floods is 85.7% since 1960, the certainty coefficient is 0.87 and 0.93 and the peak discharge accuracy is 86.5% and 96.3% respectively of “August 1992” and “August 1996” flood forecasting. [ABSTRACT FROM AUTHOR]

Earth observation satellite remote sensing can provide reliable wide-ranging spatial information and is believed as one of the key technologies for flood risk identification and dynamic modelling. Aiming at illustrating how satellite remote sensing technology promotes flood studies,this paper reviewed the development and technical demands of flood risk identification and dynamic modelling research and analyzed the historical contribution and periodic utility of spatial remote sensing information in flood studies based on the 3-stage evolution trajectory of earth observation satellite remote sensing. Application progresses in 3 typical methods in flood studies,which are risk zoning,hydrological modelling and microwave remote sensing monitoring,respectively,have been discussed and summarized. Focuses of the future research on flood risk identification and dynamic modelling have also been pointed out,including the integration of remote sensing spatial information and model algorithms,the development and application of remote sensing algorithms and systems,the development and application of an integrated system for typical methods and the application of big data methodology and technology,in expectation of providing valuable references for improving the response capacity and risk management level of flood disasters. [ABSTRACT FROM AUTHOR]

Rainstorms were frequent in the Yellow River basin during the flood season in 2018 and 3 numbered flood process at the mainstream, the high water level and large flow lasted for three months in Ningmeng reach. The paper analyzed the characteristics of rainfall and runoff, flood routing and sediment concentration process during the flood season of Ningmeng reach. The erosion-deposition variation and flow capacity of Ningmeng reach were analyzed through sections arbitrage of main hydrological station, calculation of section area under the same level and relation curve drawing of water level and area. The results show that the average precipitation and inflow during flood season of Ningmeng reach in 2018 are more than the average over the years, and there are three larger flood processes with high water level, large discharge and three large sediment peak process in Ningxia reach. The channel scouring is obvious and the flood carrying capacity has been increased significantly during the flood season of Ningmeng reach. In addition to Toudaoguai hydrologic section, all the sections below Shizuishan Hydrologic Station occur obvious scouring process. [ABSTRACT FROM AUTHOR]

This paper evaluated the risk of reservoirs collapse caused by nature-flood-based dam overtopping using a Bayesian network. Probabilities of single and cascade reservoirs collapse were calculated for reservoirs in Sichuan Province. The analysis demonstrates that Bayesian network is intuitive and user-friendly to investigate the risk of reservoirs collapse under multiple risk sources. A same conditional dam overtopping probability magnitude of 10-6 is derived, indicating a low risk of single reservoir dam overtopping. However, the conditional probability of dam overtopping is over 0. 8 when the water storage level is higher than normal, meaning there is a high probability of dam overtopping under this condition. [ABSTRACT FROM AUTHOR]

Combining flood hydrograph generalization and Support Vector machine for Regression ( SVR) , a new gradual and continuous channel flood forecasting technique was presented in this paper. A research about channel flood forecast was performed on the Wubu-Longmen reach of the middle Yellow River. Twenty eight flood events during the period between 1980 and 2000 were used to generate the flood hydrograph model and calibrate the SVR-GA models applied to forecast flood peak and duration. With the amplifier of forecasted flood peak and duration ,the flood hydrograph model was amplified to obtain the forecasted flood hydrographs. Five flood events during the period between 2001 and 2006 were forecasted to test forecast accuracy of the new technique. The results indicate that the forecast accuracy of the new technique increases continuously by using the updating relevant data. In addition, forecasted flood hydrograph performes well during the whole flood process. [ABSTRACT FROM AUTHOR]

Agricultural flood and drought are the major factors that constrain the agricultural production in China. In view of the deficiency of information diffusion theory model, an entropy information diffusion theory model for agricultural flood and drought risk assessment was built in this paper, and a case was taken which verified that the entropy information diffusion theory model is superior to the information diffusion theory model in the aspect of estimation results. Then, the entropy information diffusion theory model is employed to assess the risk of agricultural flood and drought in the 30 provinces/municipalities/autonomous regions of the mainland of China (Chongqing city is contained in Sichuan Province) based on the data gathered during the period of 1985-2013, and a comprehensive comparative analysis is conducted on the agricultural flood and drought risks in China based on the assessment result. According to the evaluation and the analysis, China is faced with serious agricultural flood and drought risk; the agricultural drought risk is obviously higher than the agricultural flood risk in China; agricultural flood and drought risks exhibit a remarkable spatial pattern; the high and medium risk area of agricultural flood are mainly found in the middle and lower reaches of Yangtze River and Northeast China, while the high risk area of agricultural drought disaster are mainly observed in the northern part of China and Northeast China. According to the spatial distribution pattern of agricultural floods and droughts in China, the southern part of China is susceptible to flood, the northern part of China is susceptible to drought, and Northeast China is faced with the overlapped effect of flood and drought. [ABSTRACT FROM AUTHOR]