China Irrigation and Drainage Development Center

Beijing, China

China Irrigation and Drainage Development Center

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Zheng J.,China Agricultural University | Li G.-Y.,China Agricultural University | Han Z.-Z.,China Irrigation and Drainage Development Center | Meng G.-X.,China Institute of Water Resources and Hydropower Research
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2011

A distributed hydro logical model was developed for piedmont irrigation district based on the SWAT model (Soil and Water Assessment Tool) and the artificial-natural effect on the hydrological cycle for this kind of piedmont irrigation district was considered. Based on the interference of artificial irrigation canal, drainage ditches and river, the SWAT model was modified in the aspect of extraction of ditches, division of distributed subbasins and hydrologic response units, as well as the method for calculating crop actual ET. The modified SWAT model was applied to the irrigation district of Fenhe River basin. The hydrology, weather and water use information from 1996 to 2001 of the irrigation district were used to simulate and analyze the water balance. The sensitive parameters were estimated. The model was further validated with the monthly flow data of 2002-2006, which attained excellent results. The simulated results of two monitoring points meet the estimated requirements, and SWAT model is applicable to the Fenhe irrigation district water balance simulation.


Han Y.,Beijing Forestry University | Fan Y.,Chinese Academy of Agricultural Sciences | Yang P.,China Agricultural University | Wang X.,CAS Research Center for Eco Environmental Sciences | And 4 more authors.
Geoderma | Year: 2014

This study provides a new understanding to sources of nitrogen (N), and may serve as a foundation for further exploration of anthropogenic effects on N inputs. Estimation of net anthropogenic nitrogen inputs (NANI) was based on an inventory of atmospheric N deposition, N fertilizer use, N in human food and animal feed, seeding N and N fixation. This study took a step forward to calculate NANI in detail on a regional scale, and analyzed its temporal variations and geographic differences. Over the past 28years, NANI increased significantly in Mainland China, from 2360kgNkm-2yr-1 to 5013kgNkm-2yr-1. On a geographical basis, NANI was higher in southeast where China's eight major watersheds are located than in northwest, and the largest NANI, 26160kgNkm-2yr-1, appeared in Shanghai. The administrative regions corresponding to Haihe watershed, Huaihe watershed and Tai lake watershed have the largest NANI. N input of fertilizer is the largest source of NANI, followed by atmospheric N deposition and N fixation. The primary factor in relation to the change in NANI is total population density, followed by cultivated land area and total grain yield. In those densely populated large cities and watersheds, reasonably allocating the social resources to reduce the existing population density is the most effective way to address the problem of high N inputs, while in those agriculture-dominated regions and watersheds, the most effective way for reducing NANI is to improve fertilizer utilization efficiency in agriculture. © 2013 Elsevier B.V.


Zheng J.,China Agricultural University | Li G.-y.,China Agricultural University | Han Z.-z.,China Irrigation and Drainage Development Center | Meng G.-x.,China Institute of Water Resources and Hydropower Research
Mathematical and Computer Modelling | Year: 2010

A distributed hydrological cycle model of an irrigation district was developed based on the SWAT model (Soil and Water Assessment Tool) and an artificial-natural composite of the hydrological cycle was considered. The SWAT model was modified in the aspects of the extraction of ditches, distributed subbasins and hydrologic response units, and the calculation method of the crop's actual ET. The applicability of the model was validated in the Fenhe irrigation district. The information on hydrology, weather and water use from 1996 to 2001 in the Fenhe irrigation district was used to simulate and analyze the water balance. The sensitive parameters were estimated by En s, RE and R2. The model was further validated with the monthly flow data from 2002 to 2006. The results showed that the simulated results of two monitoring points meet the estimated requirements. The RE value of the average annual runoff at the Erba Station varied from -7.34% to 19.13% except a low RE value (-30.70%) in 2006. The RE of the average annual runoff at the Yitang station was from -17.21% to 9.86% with an exceptional RE value (-21.13%) in 2003. From the monthly simulated results, the R2 of the monthly runoff at the Erba and Yitang stations was 0.81 and 0.77, respectively. The En s of the monthly runoff was 0.72 and 0.65, respectively. A modified SWAT model was applicable for water balance simulation at the Fenhe irrigation district. © 2009 Elsevier Ltd. All rights reserved.


Li Y.,China Agricultural University | Yan H.,China Agricultural University | Xu C.,China Irrigation and Drainage Development Center | Xiao J.,China Agricultural University | Li W.,China Agricultural University
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2013

Based on the model of droplet dynamics and evaporation, the simulation method of droplet flight was put forward under the wind condition. Software of simulating sprinkler water distribution was developed by Visual Basic 6.0. With the radial water distribution data of single sprinkler, the software could simulate water distribution of single sprinkler or sprinkler irrigation system and calculate combined application rate, uniformity coefficient and evaporation loss rate of sprinkler irrigation system. Taking the sprinkler 9708A as example, radial water distribution of single sprinkler and water distribution of sprinkler irrigation system with the combined spacings of 14 m × 14 m and 14 m × 12 m were simulated and compared with the measured values under the pressures of 0.20, 0.25 and 0.30 MPa. The results showed that the simulated values of radial water distribution of single sprinkler had the same tendency as the measured values on the whole, the relative error between simulated and measured values of flow rate ranging from 0.83% to 8.01%, that of the uniformity coefficient (Cu) ranging from 0.44% to 7.77%, and the simulated evaporation loss rate ranging from 0.51% to 1.75%. Several cases of sprinkler water distribution with different combined spacing were compared by using the developed software and other software. The relative error of the simulated values of Cu varied from 0.11% to 2.44%.


Li X.-H.,Hohai University | Zhang Z.-Y.,Hohai University | Yang J.,CAS Institute of Soil and Water Conservation | Zhang G.-H.,China Irrigation and Drainage Development Center | Wang B.,Northeast Agricultural University
Pedosphere | Year: 2011

Rainfall, runoff (surface runoff, interflow and groundwater runoff) and soil loss from 5 m × 15 m plots were recorded for 5 years (2001-2005) in an experiment with three treatments (cover, mulch and bare ground) on sloping red soil in southern China. Surface runoff and erosion from the Bahia grass (Paspalum notatum Flugge) cover plot (A) and mulch plot (B) during the 5 years were low, despite the occurrence of potentially erosive rains. In contrast, the bare plot (C) had both the highest surface runoff coefficient and the highest sediment yield. There were significant differences in interflow and surface runoff and no significant difference in groundwater runoff among plots. The runoff coefficients and duration of interflow and groundwater runoff were in the order plot B > plot A > plot C. Effects of Bahia grass cover were excellent, indicating that the use of Bahia grass cover can be a simple and feasible practice for soil and water conservation on sloping red soil in the region. © 2011 Soil Science Society of China.


Zuo C.-Q.,China Institute of Water Resources and Hydropower Research | Zuo C.-Q.,Chinese Ministry of Water Resources | Zhang G.-H.,China Irrigation and Drainage Development Center
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2012

Based on the kinematic wave theory, a basic equation has been deduced to describe the runoff generation on a slope under the condition of natural rainfall with different rainfall intensities. The equation can be numerically solved by applying the Preissmann format. The feasibility of the model is verified by field experimental data. The maximum deviation between calculated results and experimental data is within ±17%. Putting field testing rainfall information into the model set up in this paper, the processes of rain?fall under different rainfall intensity condition were simulated, which indicated that the start of runoff yield time in the ground covered and apply covered by Bahia grass is obvious later than that in the bare ground, and the peak flow was less than that in the bare ground in evidence, making out that the measures by covering and apply covering with Bahia grass have significantly effect on reducing and suspending peak flow effect.


Ni W.,China Irrigation and Drainage Development Center
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2010

The main elements of the rural water conservancy are irrigation and drainage engineering, and rural water supply. The current work of rural water conservancy includes three main objectives, such as reinforce of dangerous reservoirs, safety of rural drinking water, and reform of water-saving irrigation for irrigation regions, which includes reform of water-saving irrigation for large and middle scaled irrigation regions, reform of large scaled pump stations for irrigation and drainage systems, construction of small scaled agricultural water conservancy projects, and water-saving irrigation etc. Progress of above situation was analyzed in this paper, which also included overview of rural water technology development, such as research progress of water-saving irrigation techniques, rural drinking water technology and their integration, and the rapid evaluation and software development of the modern irrigation region management, water resource management technology which based on crop evapotranspiration. After discussing the technology requirement and key areas of rural water conservancy, the author thinks that we should increase joint research, accelerate the transformation and promotion of research fruits, pay attention to the relationship between inputs and outputs. Suggestions for extension service of rural water conservancy should be focused on the increase of farmers' income and the improvement of their living conditions, increase the guidance, support of rural water-related key enterprises, accelerate the transformation of scientific and technological achievements, give full play to enterprises in the important role of technology promotion.


Chang M.,China Irrigation and Drainage Development Center | Fan Y.,Beijing Forestry University
Applied Mechanics and Materials | Year: 2013

Early warning system of water resources security is a multi-level and complex system made of many factors. By analyzing current situation of water resources security early warning, operating mechanism of water resources security early warning system is put forward. Logic, time and knowledge related to operating mechanism are discussed. For early warning threshold decision is one of key technologies in water resources security early warning, warning threshold decision and warning degree classification of water resources security early warning are set forth. These methods are systematic method, control chart method, catastrophe theory method and expert decision method. Adopting the water resources security early warning system, situation can be analyzed and predicted promptly and effectively. © (2013) Trans Tech Publications, Switzerland.


Zhang G.,China Irrigation and Drainage Development Center | Xie C.,China Irrigation and Drainage Development Center | Pi X.,Water Service Bureau of Chaoyang of Beijing City | Wang B.,Northeast Agricultural University
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

The existing water-distribution models in irrigation canal system are established on the basis that the water discharge of the lower-level canals are equal and the cross sections of upper-level canals are unchanging with equal hydraulic power parameters, which limited the application of models. A new-type refined water-distribution model was developed, which took into account such factors as variations of water discharge of the lower canals and the conditions of section changes of the upper canals. By means of constructing reasonable fitness functions and through high-efficiency processing with the limited conditions, the model was solved based on free search algorithm. The application result showed that compared with the original way of water-distribution, water loss by this model reduced by 8.26%. As a result, the course of water-distribution was more regular and the regulating frequency of sluice gates was effectively reduced.


Han Y.,Beijing Forestry University | Yu X.,Beijing Forestry University | Wang X.,CAS Research Center for Eco Environmental Sciences | Wang Y.,Beijing Forestry University | And 3 more authors.
Chemosphere | Year: 2013

This study provides a new understanding on sources of P, which may serve as a foundation for further exploration of anthropogenic effects on P input. Estimation of net anthropogenic phosphorus input (NAPI) was based on an inventory of phosphorus (P) fertilizer use, consumption of human food and animal feed, seeding phosphorus and non-food phosphorus net flux. Across Mainland China, NAPI had an upward trend from 1981 to 2009, which reflects development trend of the population and economic. NAPI for years 1981, 1990, 2000 and 2009 are 190kgPkm-2yr-1 (1.8kg P per person yr-1), 295kgPkm-2yr-1 (2.5kgP per person yr-1), 415kgPkm-2yr-1 (3.1kg P per person yr-1) and 465kgPkm-2yr-1 (3.4kgP per person yr-1), respectively. On a geographical basis, NAPI per unit area is lower in northwest Mainland China than in southeast Mainland China with the largest NAPI of 3101kgPkm-2 yr-1 in Shanghai, while NAPI per person is in reverse with the largest NAPI 7.7kg P per person yr-1 in Tibet. P input of fertilizer is the largest source of NAPI, accounting for 57.35-83.73% (109-390kgPkm-2yr-1) of the total NAPI, followed by non-food P and P in human food and animal feed. Year 2000 was a critical point where P changed almost from net input to output. Grain production rate per unit mass of fertilizer showed an obvious downward trend. The primary factor in relation to the change in NAPI is total population. © 2012 Elsevier Ltd.

Loading China Irrigation and Drainage Development Center collaborators
Loading China Irrigation and Drainage Development Center collaborators