The core stakeholders of river basin such as original habitant、enterprises and government, had never been come out at the same time in the watershed governance history. Their interests and influence changed dynamically, the incentives of cooperation and governance contracts are different with the stakes of different periods. From the evolution analysis of the governance mechanism, this article shows that the present of enterprises destroyed the balance situation of river-basin eco-system, but the local benefits seems improved at the cost of heavy society loss, so the government compulsory management became the necessary. While the benefit of central and local government is different, the government governance get into dilemma. Further research finds that, even if higher levels of government no longer asses the local officials based on the GDP index, doesn’t mean the governance policies effective, also need to satisfy the constraints and then will take positive role. The analysis of residents、enterprises and government revenue function proofs the effective practical mechanism of government-led river-basin governance.

This paper described the basic concept of environmental flow and introduced four kinds of domestic and foreign methods. They are hydraulic method, hydrological method, habitat simulation method and holistic analysis method. By means of hydraulic method, hydrological method and ecological flow velocity and flow method in which taked fish into account, the paper calculated environmental flow of the river of Beibu Gulf economic region. Finally, it compared and analyzed three results. The result of ecological flow velocity and flow method is minimum environmental flow of Nanliu River of Beibu Gulf economic region that is 25.75 m3/s.

The hydrologic conditions, degradation coefficients of the pollutants, pollutant concentration and the generalization of the sewage outlet are the parameters which influence the precision of Assimilative Capacity. The paper discusses the uncertainties of these parameters, analyses the influence mechanism to Assimilative Capacity theoretically. Taking a water zone as example, the quantitative influence of the sewage outlet generalization, hydrologic conditions, degradation coefficients and the pollutant concentration to Assimilative Capacity are calculated separately. When the design discharge is given a fixed value, the conclusions can be drawn as follows: Assimilative Capacity calculated in which the sewage outlet is generalized to intensively distributed is close to that of the sewage outlet generalized to evenly distributed, and Assimilative Capacity increases with the distance between generalization point and the end section in an exponential type when the sewage outlet is generalized to intensively distributed; the target pollutant concentration in water body and the initial pollutant concentration have bigger influence to Assimilative Capacity; the influences of the degradation coefficients of the pollutants and the flow velocity are weaker compared to the pollutant concentration.

Water projects in South China region were often affected by a kind of shellfish – golden mussel, Limnoperna fortunei. They attached in a number of water facilities such as water pumping stations, water pipelines, power plant cooling systems, water collection wells, sedimentation tanks and other waters, blocking off the water channel. Their feces will produce secondary pollution. While golden mussel growing, especially in a large scale of growth will consume dissolved oxygen in water, cause further deterioration of water quality, so that cause serious economic losses and environmental hazards. In this paper , the ecological hydraulic was introduced to study the ecological characteristics of the Limnoperna fortune, such as the geometry, temperature, water depth and so on.

Based on the observed pH values of the Wuliangsuhai Lake, the support vector regression (SVR) method of ε-SVR and kernel functions were analyzed. Then the model using ε-SVR with radial basis kernel was setup to predict the pH values. In addition, the algorithms of linear regression, back propagation neural network and radial basis function network were introduced to verify the accuracy of the SVR model. The results indicates that: (1) the accuracy of simulated results using RBF kernel in ε-SVR is superior to using other kernels; (2) the ε-SVR has more excellent fitting accuracy and prediction accuracy than the other methods such as linear regression, back propagation neural network and radial basis function network. The study results adequately support the conclusion that the SVR has outstanding learning capacity and generalization capacity and the method can be used in water quality prediction.

Based on the low-temperature and low-turbidity water coagulation effect is poor, treatment method of complex situation, with Weishan Lake of low-temperature and low-turbidity water as test samples, through jar test discussed the use of polymeric aluminum ferric chloride as coagulant coagulation effect. In the test sample adding different amounts of selected coagulant solution, with an electric blender, mixing, reaction after the test in different static settling time supernatant turbidity and chromaticity, taking the average value as a result of the determination. The results show that: the temperature of 2.4℃, static settling 21 minutes sediment ,supernatant turbidity of settling that meet the requirements; coagulant ferric oxide in the content without causing chroma increased; at this time the optimal coagulant dosage is 10mg / L. Visible, without adding a coagulant directly under the conditions of use of polymeric aluminum ferric chloride as coagulant to treat Weishan Lake low-temperature and low-turbidity water ,the method is simple, can achieve satisfactory effect of coagulation.

Research on hydrolytic acidification-aerobic biological contact oxidation-Fenton oxidation processes to treat Azocarmine G dye wastewater was made. The experiment results showed that COD was less than 60mg/l and chroma was less than 30 times in the effluent when COD was 832.53mg/l and chroma was 1042 times in the influent, which met standard Ⅰof 《Discharge standard of water pollutants for dyeing and finishing of textile industry（GB4287—92）》and also met the local standards of Jiangsu province and Shandong province.

According to the problem of sediment deposition in the lower approach channel of Pak Beng hydropower station, numerical simulation was conducted by use of plane two-dimensional sediment mathematical model, and the 5-year deposition process of lower approach channel especially the entrance area was obtained. On this basis, flushing flow rate and flushing time of the channel scouring sluice were discussed, and measures to improve the flushing effect of channel scouring sluice were proposed. It’s suggested that flushing time be chosen when the discharge is small, and the sand scouring in the lower approach could be conducted at mid-night, when load is at a low ebb in order to reduce the loss of the electric energy.

Aiming at the Shiyanghe Basin, a multi-source, multi-user and multi-objective water resources optimal allocation model was worked out. The benefit of living, agriculture and ecological environment shall be converted to commensurable benefit on the basis of industrial water benefit, then transform the multi-objective problem into a single-objective one based on method of index weight. 11 non-inferior solutions have been screened from 36 optimal solutions, finally get the equilibrium solution by approximate aspiration dot arrange method, that is, optimal allocation of limited surface water , ground water and diversion water in four major departments: industries, living, agricultural and the ecological environment. The example is presented to verify the feasibility and availability of the approximate aspiration dot arrange method.

In order to ensure the normal and benign operation of the water resource security system, in addition to its own self-organization, we must have a scientific and reasonable adjustment to and control over the system. This Thesis brings forward the connotation of the water resource security system and the basic process of its operation. Its basic process includes five steps, i.e. botanizing water resources from the natural system, protecting the water resources polluted by social living, transforming and processing natural water resources into social products, consuming social products and discharging wastes into the natural water resource system. The control process of the water resource security system is a complicated system engineering issue that involves many factors and is characterized by initiative, uncertainty, unknowing, in-development and decentralization. This Thesis brings forward the basic principle for the control over the water resource security system and pointed out that the coordination and control of the water resource security system include two aspects, namely, resource coordination and task coordination. On the basis of the local optimization of every system at single level, we should realize the overall safe operation and optimization of the multi-level large water resource security system.

Climate in Hexi inland region is dry. Water resources are limited. Outstanding contradiction exists between ecosystem water demand and social-economic development. This conflict becomes more serious with continued population increase and rapid social-economic growth. Downstream of Heihe, Shiyanghe, and Shulehe, severe eco-environmental problems such as land desertification, abandoned farmland, wilting vegetation, and shrinking wetland emerges one after another. The ecosystem support capacity based on different levels of water-saving agricultural practices is analyzed along with the Twelve Five-year Plan. This will provide important reference to the establishment of the ecosystem construction plan.

Traditional grey prediction model have many of application in waterlog prediction, but it's precision is very low. To improve the prediction precision, this paper add grey relation application on the basis of traditional grey prediction model, the model finds dependency relationships of sequences based on the grey incidences degree, uses the grey prediction model to forecast the trend of development among data ,apply of 1980-2010's data of Shenyang, set up combined prediction model, the results show that the effect is better than traditional grey prediction model, added a new means to predict patterns.

So many of hydraulic projects and so frequently of human activities in this river basin result in lacking of consistency on actual measured flood data from hydrometric stations in main stream. Due to not having the conditions to using the water balance, the upper-lower related flood, storm flow, and other common methods, we need find a solution to this question from another perspective. This paper would try to take the consumption effect from upper reservoirs into consideration, revising the computation results of actual measured flood data from hydrometric stations, and finally, making a reasonable and reliable achievement.

In this paper,the volume and days of the rainstorm in some one river basin was analyzed.The fractional dimension theory was used as quantitative analysis method to reveal the law of the flood to accompany with maximum daily flux as sample, half a month as calculation step,and diagonal relative error 5% of the fractional dimension as threshold.The result showed this method was reasonable and feasible in the paper.

The flood in mountain areas is one of natural disasters in rural areas, Miaoyuanxi stream flowing through the Shiwu village located in Quzhou City of Zhejiang province is chosen as the study object. In view of the characteristics of lack of actual flood data in small basin, the extraction’s basin feature with high precision and high efficiency is achieved based on the geographic information system(GIS).Applying the triangulated irregular network and spatial analysis function to produce the contour lines of hydrological statistical parameters, and to interpolate the needed contour lines. According to the hydrological model parameters achieved from the geographic information system, the design rainfall of different frequency under different duration are calculated through the frequency computation. Then using the rational formula, the design flood peak is obtained,which provides basis for early warning of mountain torrents.

In recent years, due to the rigorous challenges brought about by increasingly lack of water resources, the rural stormwater storage and utilization has gained rapid development all over the world, especially in the arid and semi-arid areas, where the population are mostly dependent on rain-fed agriculture. In order to learn from the advanced techniques and successful management experience gained in practice at home and abroad, the different ways of rainwater harvesting, different ways of rainwater utilization, supplemental management policies as well as social and economic benefits are reviewed in detail. Meanwhile, the research and applications in China on rural stormwater storage and utilization are also briefly introduced. Some suggestions are proposed to help decision-making and in-depth research on rural stormwater management of China in the future.

In this paper, to filter out typical the Inner Mongolia Autonomous Region Township 119 centralized drinking water source for the object of investigation and study, the survey assessed the water quality, the water resource protection zone pollution, environmental supervision capacity and the influence factors on the basis of, analyse the problem of existence and reason, put forward the Countermeasures for protecting the environment, environmental management provides basis of reference.

Although the two-part water price can reduce the manage risk of water dispatch project efficiently, it also has insecurity factors. In this paper the risk source in the implement of two-part water price is illustrated. Based on the construction characteristic of two-part water price, it is promoted that the total loss ratio, short term loss ratio, water price overrun ratio and total risk degree are used to measure the risk degree of water price schemes which have different basic water amount. The water supply cost is calculated, under which the risk degree of three water price schemes are calculated when the actual water supply is inadequate, and the conclusion is obtained that the feasible basic water amount of Jiaodong water dispatch project is the 20% percent of designed water supply amount, which scheme is proved to be risk resistant through sensitivity analysis.

The article conducted monetary value evaluation of ecosystem service function for Linghe estuarine wetland. Using method of map data visual interpretation and function classification of the wetland, identified eight main functions of wetland ecosystem services, calculated monetary value to be 67.07×108 yuan. The historical and cultural function has the largest ratio, followed by the material production function, which indicates the value of wetland is not limited to the material production function, the value of various functional services should be considered as well. By evaluation of monetary value of the wetland’s ecological function, there should be increasingly awareness on scientific and environmental conservation and development of resources in Linghe River estuarine wetland reasonably. Therefore achieve the purpose of sustainable development of Linghe estuarine wetland.

The water saving reform of irrigation area has important significance for saving water resources, improving grain yield and guaranteeing national food security. The reform effect and relative restrictive factors can be made clear by scientific evaluation of water saving reform benefit, and can provide decision basis for improving modification measures. According to the variable fuzzy sets theory, this paper presents a new method for evaluating comprehensive benefit of water saving reform of irrigation area based on the opposites unity and quantity change and quality change theorem. The proposed method can make opposites unity organically combined with dialectical understanding of problem, and can satisfy the materialist dialectics’ opposite’s unity and quantity change and quality change law, is precise for the theory and clear for the concept. The comparison and analysis of results of case demonstrates that the proposed method not only can accurately give the trend of grade, but also can clearly show the relative difference degree, and is an effective, reliable and practical novel method for evaluating comprehensive benefit of water saving reform of irrigation area.

The sustainable development of Water-Land resource relates to economy，environment and other resources． It has dynamic，synthesis，spatial variance and other characters．Combined with the characters of the regional sustainable development of Water-Land resources, an evaluation method for a quality of Water-Land resources under the basis thoughts of asset liability analysis is established in this paper． Finally，demonstrated with 14 Cities in Gansu Province，We worked out the range of the quality of Water-Land resources in Gansu province. In order to bring about the sustainable development of economy society in Gansu Province, we give a decision for foundation.

The finite element analysis of geotechnical engineering stability is based on the physical and mechanical parameters of geological materials, then according to the stress and deformation to looking for the fracture surface of the slope and evaluate the rockmass stable state. Finite element analysis choosing different yield criterions will draw the different safety factors, in this essay, using Mohr-Coulomb yield criterions and basic idea of the safety factor in the engineering to analyse the security of Each part in rock mass and define the point safety factor expression, this way the safety factor method for rockmass structure stability analysis and the quantity standard of the rockmass stability are developed. With soil slope and tunnel for example, using ADINA to analyse the stability analysis of slope and the failure mechanism of soil tunnel, explore the feasibility of the safety factor method in stability studies of slope and tunnel, which accords a new reference value for the stability analysis of geotechnical engineering.

In this paper, taking a rock slope of a expressway as an example,the finite element model was set up. According to the deformation observation data of the slope,the physical-mechanical parameters were analyzed inversely, and the stress change of the slope during each stage period were analyzed. The results showed the slope after excavation all the stress changes within permitted, can meet the required strength. In order to study the stability of the slope in the long term,Further considering creep characteristics, The creep parameters of rock masses were deduced，and the creep deformation changes of the slope during each stage period were analyzed,and the stability of slope was evaluated and predicted. It was shown that the creep deformation of the upper of parts slope was smaller than the under parts of that; before January 2011, the rock slope was unsteady after excavated and unloaded,and then it became steady, the rock displacement will keep stabl. The point 3-X axis of second platform had a biggest displacement change,more the displacement had rapidly increased to 26mm during the may 2010,and it was adversed to slope stability.The results not only provid a scientific basis for the project construction，but also have an important guiding to the slope reinforcement measures and landslide forecasting.

This paper discusses the variation regularities and influence factors of surface deformation of gravity dam taking Baozhusi concrete gravity dam as the research object. Based on the research of the basic principle and methods of establishing statistical model of surface deformation of gravity dam, a fittest monitoring model for gravity dam is put forward after factor expansion as reference by the stepwise regression method. The result shows that the improved statistics model is more precise than the conventional model.

This paper discussed the principle about rising and falling of water level of the inverted siphon’s entrance on discharge analysis, peak and minimum discharge’s hydraulic jump deduced. Under minimum discharge, hydraulic jump makes an impact on the tube falling of water level in the tube. The project steps discussed quantitative analysis and qualitative analysis taken to eliminate the hydraulic jump. It possesses guiding role designing the siphon.