To avoid the fuzziness and the subjective factors when evaluate the water quality and calculate weights,based on optimized fuzzy synthetic evaluation model,we use Analytic Hierarchy Process(AHP) to calculate the subjective Evaluation Model and use RAGA Projection Pursuit method to calculate objective weights. Then calculate the ascertaining weight according to the subjective and objective weights.Also applied this model to evaluate the underground water quality of 853Farm of land reclamation Hong xinglong administration,Heilongjiang Province.The result shows that the water quality of the first branch、third branch、sixth branch is up to drinking water standard , but the others aren，t up to standard due to Fe and Mn.Compaired with the traditional Nemerow Index Method and Fuzzy Evaluation model based on entropy weight,we can make the conclusion that the evaluated results accord with the fact of the quality of local underground water well.In addition, the new model is reasonable and the evaluation results are feasible.Morever,the new model provides a new method to evaluate the quality of regional water.

Aimed at the problem of poor water quality in modern agriculture garden, the low-carbon and ecological theory is used to design the use of garden water resource and water clean project after some research work. By collecting and using rain water resource, renewable water resource can be fully used in the garden and the water resource utilization rate will be raised; the design theory of water ecological purification in farmland water conservancy supporting facilities, to purify and maintain water quality by construct stable water ecosystem, is firstly put forward here. The design idea can give reference to similar agriculture plan and design in our country.

According to the growth characteristic of Potamogeton crispus of absorbing nitrogen and phosphorus efficiently from water, the outdoor field investigation and indoor simulated experiment were performed to research the effect of Potamogeton crispus on different species of nitrogen in Spring. The results indicated that different species of nitrogen was first absorbed then released by Potamogeton crispus, the absorption rate of NH4+-N was most with 86.44% and release rate of NH4+-N was also most with 721.62%, but the absorption rate and release rate of NO3--N were both least. There was a significant effect of distribution density of Potamogeton crispus on different species of nitrogen.When the distribution density of Potamogeton crispus was increased from 40 plants/m2 to 70 plants/m2, absorption rate and release rate of nitrogen decreased, and the best purifying effect present in D area with 40 plants/m2. The indoor simulated experiment showed the same regularity with the outdoor field investigation, and both two experiments found that different species of nitrogen would increase during the death of Potamogeton crispus. This research provides a theoretical basis for purifying water by Potamogeton crispus.

Base on field research and data analysis, considering the distribution of pollution sources in the region of Taipingzhuang gate-Sanyanggang tide gate on the Xinshuhe River, a distributed waste load model(DWLM)was established to calculate the pollutant quantity inlets into river. A 2D unsteady hydrodynamic water quality model in the FVS form for the channel reservior between 2 gates was established, and the simultaneous hydrodynamic and water qulity data were used to calibrate and verify the model. Using the numerical model, when the inflow of the upstream boundaries were Ⅲ standard of the water function zone and the most adverse conditions(pollutants entering river),the hydrodynamic and water quality processes of the studied area were simulated, and the changing process of the water quality concentration fields with the times of storage were quantitatively estimated.The results showed following: when the inflow of the upstream boundary met the level Ⅲ standard of the water function zone, the contamination concentration field was smaller than that under the adverse condition, and when water storage time was 45th day, the Fanhe gate intake for agricultural irrigation was covered by contamination field under the adverse condition,even so the water quality concentration reached the standard for irrigation.

Based on MATLAB，the water quantity and quality mathematical model is established，which includes multi-pollutant indices. The constraint conditions of this model are not to increase the total amount of water for Aiyi River. And the goal of it is that the main pollutants are controlled within the national surface water environmental quality standards of grade IV. And then，the model is used to research on the scientific and reasonable replenishment mechanism，which is suitable for the healthy development for Aiyi River.

For the reservoir flood control,elaborated the concept of controllable flood and uncontrollable flood,and research morphology of flood impact on the highest regulation level.Through the calculation,and analysis of different series impact on the highest level of flood.It is shown that the regulation levels between starting regulation level and the highest regulation level are controllable.On this basis,according to the form given reservoir flood the highest possible level and flood forecasting,we can quick identification about influence of a flood on reservoir safety could be realized,On this basis, appropriate to adopt flood control scheduling to ensure safety.

The paper analyses the characters of flood protection engineering. The decision index system is built for the flood protection engineering plans. And the TOPSIS priority of flood protection engineering based on AHP and entropy was proposed. The model considers the experts’ experience knowledge and information implicated in data. The comprehensive weight of each index is combined by applying AHP and entropy weight. The flood protection engineering plans can be optimized by the similarity to ideal solution method. Finally, taking an example of a flood protection engineering plans, which illustrates the validity and usefulness of the model.

The leakage of rockfill dam in the Yangjiang reservoir is serious, affecting the safety and normal operation of the dam. Taking the engineering practice into consideration and making the comparison on economy and technology, grouting for seepage prevention was adopted to repair the original seepage control system. In this paper, the grouting technology of this project was studied, grouting field tests were done respectively in the rockfill area and transition area, and the practical and reasonable grouting schemes were put forward.

Abstract：According to the design characteristics of steel gate, the parametric design method combining 2D and 3D is put forward. By means of the 3D modeling of gate based on Solidworks Software,the interference detection of bottom support and top support is made,and optimized the interference regions of parts.It improves efficiency and accuracy by turning 3D modeling to 2D drawing.The kinematic simulation is carried out on the gate of COSMOSMotion , which can visually display the gate operation and verify the reasonable of design.

In this paper, aiming at the structure dynamic response of the large scale aqueduct under water sloshing effect , by structural dynamics and fluid dynamics to simplify the sloshing damping effect between water and slurry wall of the groove, and built aqueducts equivalent mechanical models, and input horizontal EL-centro wave. With 3D FEM and the timing analysis technique, the dynamic displacement and stress under different discharges are calculated and analysed. Results show that compared with other directions , transverse dynamic displacement was more significantly affected by the shaking hydrodynamic pressure of water in the aqueduct; compared with added mass calculation results, computed by equivalent mechanical model of structure dynamic response are varying degrees lower, and horizontal reductions is the most significant of these; In the design of large-sized aqueduct structure, taking into account the liquid damping effects of added mass method compared to equivalent mechanical model is closer to reality, this article provides a reference basis for the practice engineering . mechanical model and the traditional method of added mass for engineering analysis. The results indicated that equivalent mechanical model has correctness and precision; under the action of lateral seismic, hydrodynamic pressure of water sloshing of aqueduct effects lateral displacement of slots significantly; because of additional quality law did not considere liquid shaking damping effect, the displacement and stress results are relatively conservative, on the dynamic analysis of large aqueduct, damping effect of impac should be taken into consideration.

In order to eliminate the uncertainty in the calculation process and ascertain the influence of the parameters on the simulation of rainfall-runoff, the sensitivity of the parameters is analyzed．And by LH-OAT sensitivity analysis method, the influence degree of different parameters on the simulation results of runoff in ZhaoTong city is analyzed. Confirmed several parameters which have greater impact and provided a reference for the parameter calibration. The results indicated that the most sensitive parameter for runoff coefficient was the infiltration attenuation coefficient, the most sensitive parameter for the runoff peak flow was the Impervious rate. The reliability of SWMM model is improved when used in the Jinsha River Basin.

There are some problems in applying traditional principal component analysis method to comprehensive evaluation of water resources, which including evaluations linear problem and traditional method can not reflect the importance of subjective evaluation, also the assessment scope can not be determined. To solve the above problems, this paper has improved the traditional method. First, the method uses improved terrible formal methods in undimensionlization, then considering the subjective weights on covariance calculation with the undimensionlization date, and using the positive and negative ideal point to inspect covariance eigenvectors; Next, in the calculation of comprehensive evaluation, the method takes the effectiveness of the eigenvectors into account, which respectively, the positive and negative extreme value; At last, the range of the evaluation value is obtained. Simultaneously, using combined improved method and comprehensive system of evaluation index to evaluate Regional Water Resources of Nanjing city, the results are basically accurate. Besides, the results are also more reasonable compared with the traditional method, gray relational analysis and expert system evaluation method.

The sensitivity analysis is a key and difficult issue to the application and development of the hydrological model . In this paper , local sensitivity analysis method and several qualitative and quantitative globe methods are inducted , which include the following methods : multiple regression method , Morris , Morris-OAT , FAST , LH-OAT , Sobol , Extend FAST , RSA , GLUE , RSMSobol and so on . We prospect the future development of the sensitivity analysis of the hydrological model .

As south-to-north water transfers gradually put into operation, Miyun Reservoir will be faced with a high water level.In research of this paper, we carried out the research of Miyun Reservoir flood forecast.Flood forecast model was establised based on the EasyDHM model and by using the runoff generation model of EasyDHM, the Muskingum method,the parameter sensitivity analysis method LH-OAT and the parameter optimization method SCE-UA,parameters were calibrated and flood events are simulated. the model was also validated through the session flood.The results show that the modelhas good applicability in the Miyun Reservoir basin.

Based on the study of the natural、socioeconomic and eco-environmental attributes of river basin, classification method is raised according to resources endowment、bearing capacity and development potential of river basin. River classification plan for 25 main streams or independent streams based on water allocation is made. The key points and suggestions which should be considered in the water allocation plan madding of different river types are put forward.

Reservoir backwater flooding is an important reason for the ecological destruction and resettlement. The reservoir backwater level and pinch point positions which are determined accurately are the important prerequisite for resettlement plan and submerged physical survey. Because the current mathematical and physical models have a certain lag, the model of reservoir backwater level and pinch point responses is established based on the hydrological data of water frequency. Verification shows that the model could reflect variation of reservoir backwater level and pinch point position for different water frequency quickly and accurately. The model could be used to respond the reservoir backwater level and pinch point position based on the different water frequency，and it also lends a reference for the scope of the reservoir backwater inundation and resettlement projects which are determined.

During Pubugou reservoir’s initial impounding,take Shenxigou cofferdam reservoir as the regulating reservoir, and take 50%,80%,90% as guaranteed rate of runoff. In this case, study the processes of Shenxigou reservoir’s storage in advance,Pubugou reservoir’ closing gate,Shenxigou reservoir’ draining water temporarily, as well as their Specific practices. And take the 80% guaranteed rate of runoff as the design guaranteed rate.During the implement, we discuss the running of the two reservoirs, when the upstream flow is 960 m3/s, and Niri river’s flow is 64 m3/s.

With the finite volume method and unstructured grid, RNG turbulent model is adopted to simulate the interior three-dimensional flow of siphon outlet pipe. On the basis of numerical simulation results, analysis of the pipeline internal hydraulic characteristics, and put forward the Siphon outlet pipe optimization scheme by changing the main parameters influencing the siphon hydraulic characteristics. Comparing the optimization scheme with the original scheme, optimization schemes were obviously improved in the flow regime, pressure distribution and hydraulic losses, it can provide a reference for the siphon outlet pipe hydraulic optimization design. Key words: siphon pipe; numerical simulation; hydraulic optimization

To meet some special requirements of flood control and drainage, such as large variations in water level and poor installation environment, the combination-pontoon mobile pumping station is designed and made in this paper. The mobile pumping station takes pump-on-top submersible electric pump as packaged unit, small pontoons as floating body, hose as outlet pipe and use rigid bars and rope to fixed. This paper focuses on the stability check, describes the performance, and puts forward the application of combination-pontoon mobile pumping station. The calculation and analysis show that if 11 small pontoons are used, the mobile pumping station would has a higher safety factor, the front edge and trailing edge of pontoon would be partially immersed in water and the mobile pumping station would be stable equilibrium. If 10 small pontoons are used, the safety factor would be high, the mobile pumping station would be still stable equilibrium, the eccentric mounting of submersible electric pump would come true, and the trimming angle would be reduced. The combination-pontoon mobile pumping station has met the design requirements. It has the advantages of easy dismantling and remounting, convenient transportation, good stability and high reliability. It has a certain practicality and promotional value.

Regarding a type of double suction pump as the research object, analyses the effect of the geometry parameter of half-spiral suction chamber on the unstable flow field’s pressure pulsation in a centrifugal pump. On the basis of ensuring the same that the basic geometric parameters of suction chamber, designed two kinds of calculation scheme by changing the shape of cross section and the position of tongue. The full port unsteady numerical calculation were performed for the double suction centrifugal pump of different design scheme,based on the Navier-Stokes equation and the standard two-equation turbulent model of ,using the body-fitted coordinates,unstructured-tetrahedron grid and SIMPLEC algorithm,which obtained the pressure pulsation characteristics of the monitoring points in centrifugal pump and analysed. The calculation results indicates, with the change of the suction chamber section shape and tongue location with horizontal line from 90o to 45o, the curves of pressure changes that the suction chamber monitoring points in scheme Ⅱ tend to be uniform and smooth; in the pressurized-water chamber, affected mainly by the rotor-stator interaction of impeller and tongue,the pressure fluctuation of two schemes are the same almost in the tongue, while the uniformity of the monitoring points’ pressure change of the scheme Ⅱis better than the scheme Ⅰ,which improved the stability of unit operation, and provides a theoretical reference and practical application for further studying the design of the double suction centrifugal pump suction chamber .

During Jiangsu county water conservancy modernization planning’s preparation process, the related issues about it from the perspective of analytical methods is discussed. Takes Sheyang County in Jiangsu Province, as example, the status of the county water conservancy internal conditions and the external environment is analyzed. Proposed way uses SWOT method to analysis the water conservancy modernization strategy of counties. By the analysis of internal conditions’ strengths or weaknesses and opportunities or threats of the external environment, then establishes SWOT strategy to make a plan of water conservancy and modernization of Sheyang County in Jiangsu Province is the unique pilot provinces of country' s water conservancy modernization plan, and Sheyang County’s Water conservancy modernization is an important component of Jiangsu Province, so it plays an important guiding and leading role in promoting water conservancy modernization of other provinces and counties.

With the deepening of the property rights reform of rural water conservancy, there is diversification subject of the construction and management of rural water conservancy, as well as diversification of property right structure, in order to balance the interests of investor, water user and related damaged unit,we must establish scientific benefit compensation mechanism on rural water conservancy. Based on the literature analysis of both domestic and abroad about water conservancy compensation mode, this paper analyzes the necessity of establishing elastic compensation mechanism, and focuses on using elastic mechanism to compensate investors investing in water conservancy under uncertainty earnings conditions, the compensation mechanism conducive to mobilize the enthusiasm of social investors to participate in rural water conservancy construction and maintenance, and in favor of reasonable risk sharing.

Water scarcity has been restricting the development of Ningxia "bottleneck". To explore solutions to the Yellow River water supply and demand effective way, Ningxia launched a water right transfer related work. As the water rights transfer system and the system is improving, water right transfer prices have gradually return to a reasonable. From the project cost, the amount of water-saving method of calculating water right transfer prices, etc，this paper analyzes the impact of water right transfer price factors and reasons for change.

This paper mainly discusses the status of the farmland water conservancy construction and management in United States, Japan, Australia, summed up the main features of these developed countries in the construction and management of irrigation and water conservancy, and based on the analysis of the current situation and existing problems of farmland water conservancy construction and management in our country, selective study the enlightenment and reference to our country of the construction and management experience and methods in these countries. This paper argues that our country shall establish a diversified investment mode and the participatory management mode in the construction of irrigation and water conservancy.

When allocating water resources in irrigated area using a multi-objective model, some problems must be solved, such as information acquisition problem and falling into local optimum. A Pareto ant colony algorithm (PACA) was introduced and improved through two strategies: pseudo random parallel search and nearest neighbor selection. Then PACA was coupled with 3S (GIS, RS and GPS) technology. Yinbei Irrigation District in Ningxia was selected as a case study. Optimal spatial allocation model of water resources in irrigated area, with multi-objective, multi-constraint and pixel-based characteristics, was calculated in the PACA-based GIS platform. Finally, allocation schemes, including irrigation water from wells and canals, drainage volume, economic benefit and costs from irrigation and drainage, were optimized. The integration of PACA with 3S technology can accelerate the PACA convergence, and simultaneously obtain the global optimal solution. Therefore, the method makes the optimization results more close to the reality for support and decision of water resource scheduling in irrigated area.

With the process of bigness and complication of distribution pipenet, pumps, the power offered equipments, are growing larger as well. Pump head is determined by the calculating precision of frictional head loss. And in engineering, different head loss formulas are always used randomly. So that the results distinguish from one another, especially when pipe system has a large frictional head loss or considerable amount of parallel pipelines. Thus, this paper studies on four frequently-used head loss formulas: Blassius, Shievieliev, Cheyz and Hazen-williams, calculating the head loss of different pipe system and contrasting these results. It can tell that not only the material, diameter and velocity of pipeline, but also the length and topological structure, have an impact on head loss and consequently influence type selection and matched power of pump. This paper is exemplified by a long-distance dewatering pipeline and a circulating water system, illustrating the standpoints above and bring out the applicable conditions of these four formulas on different pipenet structure or length.