Time filter

Source Type

Yu C.,Peking University | Yao Y.,Peking University | Hayes G.,University of Illinois at Chicago | Zhang B.,Peking University | And 3 more authors.
Science of the Total Environment | Year: 2010

Groundwater vulnerability assessment has been an increasingly important environment management tool. The existing vulnerability assessment approaches are mostly index systems which have significant disadvantages. There need to be some quantitative studies on vulnerability indicators based on objective physical process study. In this study, we tried to do vulnerability assessment in Huangshuihe catchment in Shandong province of China using both contaminant transport simulations and index system approach. Transit time of 75% of hypothetical injected contaminant concentration was considered as the vulnerability indicator. First, we collected the field data of the Huangshuihe catchment and the catchment was divided into 34 sub areas that can each be treated as a transport sub model. Next, we constructed a Hydrus1D transport model of Huangshuihe catchment. Different sub areas had different input values. Thirdly, we used Monte-Carlo simulation to improve the collected data and did vulnerability assessment using the statistics of the contaminant transit time as a vulnerability indicator. Finally, to compare with the assessment result by transport simulation, we applied two index systems to Huangshuihe catchment. The first was DRASTIC system, and the other was a system we tentatively constructed examining the relationships between the transit time and the input parameters by simply changing the input values. The result of comparisons between the two index systems and transport simulation approach suggested partial validation to DRASTIC, and the construction of the new tentative index system was an attempt of building up index approaches based on physical process simulation. © 2010 Elsevier B.V.


Guan Q.H.,Water Resources Research Institute of Shandong Province | Li F.L.,Water Resources Research Institute of Shandong Province | Chen X.Q.,Water Resources Research Institute of Shandong Province | Zhang Y.F.,University of Jinan | Tian C.J.,University of Jinan
Applied Mechanics and Materials | Year: 2014

In order to investigate the groundwater level and quality, and study the groundwater contaminant in vertical and the dynamics relation in different aquifers, the place of sampling and monitoring need to be installed in the relevant position of the aquifers to differentiate groundwater from different aquifers. In recent years, groundwater monitoring and sampling system has made great progress, this paper focuses on the current study and development of groundwater monitoring well technology, and analyses the development and the applied direction of monitoring well technology from single-well monitoring to multi-level monitoring, which would provide scientific references for domestic related and groundwater contaminant. © (2014) Trans Tech Publications, Switzerland.


Zhao Y.,Water Resources Research Institute of Shandong Province | Zhao Y.,Shandong Provincial Key Laboratory of Water Resources and Environment
Material Science and Environmental Engineering - Proceedings of the 3rd annual 2015 International Conference on Material Science and Environmental Engineering, ICMSEE 2015 | Year: 2016

Runoff nutrient monitoring of water and soil loss usually adopts field acquisition followed by laboratory analysis which is very complex. To verify the reliability of the rapid nutrient measurement method of Ion Selective Electrode (ISE) in water and soil loss monitoring, the nitrogen ammonia ISE as an example was compared with traditional Nessler reagent spectrophotometry by simulating rainfall. Studies were conducted with regard to accuracy, anti-ion interference and migration rule in slope runoff. Experimental results showed that: With confidence level of 95%, results of the two methods are no significant difference; the maximum value of measurement range of ISE is 1000 mg/L and that of spectrophotometric method is 2 mg/L; ISE can automatically resist ion interference; when the power function model is used to simulate ammonia nitrogen migration in slope runoff, the fitting coefficient of measurement value of electrode method is 0.9537 and that of spectrophotometric method is 0.9305. © 2016 Taylor and Francis Group, London.


Huai W.,Wuhan University | Li C.,Water Resources Research Institute of Shandong Province
Water Science and Technology | Year: 2016

Suspended canopies can cause flow disturbances such as reducing velocities within the canopy, and increasing flow beneath the canopy. Flow modifications by canopies dramatically affect the fate and transport of sediment, nutrients, contaminants, dissolved oxygen, and fauna in aquatic systems. A three-zone model is presented here to predict the longitudinal dispersion coefficient by simplifying Chikwendu's N-zone model. To validate the model, both flow field and tracer experiments were conducted using a straight rectangular Plexiglas flume, with rigid circular rods as the modeled suspended canopies. The result shows that velocities increased above the flume bed and maximized at a point between the canopies and flume bed. Above that point, streamwise velocities decreased into and within the canopies. Reynolds shear stresses were largest at the canopy interface and smallest (zero) at the velocity maximum point. Good agreement between the modeled results and experimental data shows that the model can effectively predict the longitudinal dispersion coefficient in open channels with suspended canopies. © IWA Publishing 2016.


Li J.,Tianjin University | Tan S.,Tianjin University | Wei Z.,Water Resources Research Institute of Shandong Province | Chen F.,Shihezi University | Feng P.,Tianjin University
Water Resources Management | Year: 2014

Change point detection is an effective tool to identity whether the hydrological data are of consistency. In this paper, Pettitt test was first used to detect change point for annual rainfall and runoff time series in 6 selected sub-watersheds of Luanhe river basin in Northeast part of China. Then we presented a method to detect change point according to the law of mutual change of quality and quantity in variable fuzzy sets. We chose the mean of time series as assessment index as in other change point detection methods, and defined 95 and 5 % quantiles of the time series as the supremum and infimum respectively. We selected a reference period (for example, the first 10 points of the time series) as the stationary period, and after the reference period, we checked the mean value of the time series point by point. We used this method in the 6 sub-watersheds of Luanhe river basin. The results of the 2 methods showed that most annual rainfall time series had no change point, and some annual runoff time series had change point in 1979 or 1981. Comparison of the 2 methods was made, and it indicated that Pettitt test provided reference for variable fuzzy sets method, but the latter provided more reasonable results than Pettitt test in this study. This method can also be used in other natural time series. © 2014, Springer Science+Business Media Dordrecht.


Yang W.,Nanjing University | Yang W.,Huazhong Agricultural University | Liu F.,Nanjing University | Liu F.,Water Resources Research Institute of Shandong Province | And 3 more authors.
Agroforestry Systems | Year: 2013

We analyzed the growth and photosynthetic responses of Canarium pimela K. D. Koenig (Chinese black olive) and Nephelium topengii (Merr.) H. S. Lo. (Hainan shaozi) to a light gradient to recommend better procedures for optimizing seedling establishment and growth of both species in restoration and agroforestry practices. One-month-old seedlings were exposed to four irradiance levels (46, 13, 2 and 0. 2 % full sunlight) inside shade cloth covered shadehouses for 1 year. With decreased sunlight both species displayed trends of decreased relative growth rate (RGR) and leaf area (LA), and increased specific leaf area and leaf area ratio (LAR). The mean values of light-saturated net photosynthetic rate (Pmax) in 46 and 0. 2 % full sunlight were 10. 11 and 3. 44 μmol CO2 m-2 s-1 for C. pimela and 6. 26 and 3. 47 μmol CO2 m-2 s-1 for N. topengii, respectively. C. pimela had higher RGR in 46 and 13 % full sunlight than in 2 and 0. 2 % full sunlight. Differences in growth rates can be explained by the different values of LA, LAR and leaf mass ratio, as well as by the different values of photosynthetic saturation irradiance and net photosynthetic rate (Pmax) between the two species. Both morphological and physiological responses to shading indicate N. topengii could be rated as "very shade-tolerant," while C. pimela could be rated as "intermediately shade-tolerant". © 2012 Springer Science+Business Media B.V.


Ma L.,Water Resources Research Institute of Shandong Province | Zuo C.,China Institute of Water Resources and Hydropower Research | Qiu G.,Shenzhen University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Predictions of slope erosion from 2012-2099 were made in typical case of quaternary red soil region using the downscaled future precipitation from 17 global climate models (GCMs) under SRES B1, A1B and A2 emission scenarios in the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR4) and the physically based model WEPP. The model was calibrated and validated with the satisfied results by the observed data. The ensemble method was applied in the erosion prediction, and the probabilities of changes of rainfall amount, surface runoff and erosion in different of scenarios and GCMs were tested and analyzed. The prediction results from different GCMs were remarkable divergence. Compared with the current situation, the virtually certain increasing precipitation will very likely increase surface runoff and will likely increase erosion in the future. Furthermore, three time series of annual rainfall amount, runoff and erosion modulus have the rise tendency until the end of this century. The averages of soil erosion modulus of the predictive period under all three scenarios are obviously higher than that of the present. And SRES A2 scenario which represents the highest concentrations of greenhouse gases has a biggest increment among the three scenarios. Slope erosion in quaternary red soil region of Northern Jiangxi province will reach the peak in the late period of this century with a continuous increasing tendency.


Ma L.,Water Resources Research Institute of Shandong Province | Sui L.,Zhanhua Land Resources Bureau
Applied Mechanics and Materials | Year: 2012

Sediment diverted from the Lower Yellow River is crucial for irrigation district sustainable development. As a complex problem, spatial distribution of sediment in district is related with natural geographical environment, incoming water amount and sediment concentration, methods of treatment, engineering facilities. Analysis of sediment distribution is the precondition for sediment utilization, transportation and treatment. As Bojili irrigation district for example, the paper analyzed sediment siltation characteristics in desilting branch, main canal, branch canal and field ditch with long term observed data from 1985 to 2009. Proportions of sediment siltation in different parts of irrigation system were calculated and difference of seasonal siltation in desilting branch was discussed. Besides, the paper proposed effective suggestions about reducing sediment siltation and improving transportation with long distance. © (2012) Trans Tech Publications, Switzerland.


Tian S.G.,Water Resources Research Institute of Shandong Province
Advanced Materials Research | Year: 2013

Effects of promoting rainwater infiltration and the impact factors of concave herbaceous field were analyzed in urban area of Jinan at different scenarios of designed rainfall frequencies, greening rates and concave depths. The capability of rainwater storage and infiltration is correlated negatively with designed rainfall frequency, and positively with concave depth, greening rate and soil infiltration coefficient. The results show that when the ratio of green space is 30% and the concave depth is 100mm, the rainwater collection rate of concave herbaceous field is 76.55% and 63.45% respectively under the rainfall of 1- year and 3- years return periods. © (2013) Trans Tech Publications, Switzerland.


Shi Y.,Water Resources Research Institute of Shandong Province | Liu H.,Water Resources Research Institute of Shandong Province | Fan M.,Water Resources Research Institute of Shandong Province | Huang J.,Water Resources Research Institute of Shandong Province
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Runoff forecasting which subjects to model pattern and parameter optimization, has an important significance of reservoir scheduling and water resources management decision-makings. This paper proposed a new forecasting model coupled phase space reconstruction technology with relevance vector machine, and its model parameters is optimized by an improved PSO algorithm. The monthly runoff time series from 1953 to 2003 at Manwan station is selected as an example. The results show that the improved PSO has efficient optimization performance and the proposed forecasting model could obtain higher prediction accuracy. © 2013 Springer-Verlag Berlin Heidelberg.

Loading Water Resources Research Institute of Shandong Province collaborators
Loading Water Resources Research Institute of Shandong Province collaborators