scholarly journals Simulation of multiple water source ecological replenishment for Chagan Lake based on coupled hydrodynamic and water quality models

2017 ◽  
Vol 17 (6) ◽  
pp. 1774-1784 ◽  
Author(s):  
L. Zhang ◽  
M. R. Hipsey ◽  
G. X. Zhang ◽  
B. Busch ◽  
H. Y. Li
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Water Source ◽  
Scientific Basis ◽  
Water Diversion ◽  
Chagan Lake ◽  
Simulation Results ◽  
Ecological Water Level ◽  
Western Jilin ◽  
Grade Iii

Abstract Chagan Lake serves as an irrigation storage reservoir for the Qianguo Irrigation Area and an important ecological barrier in western Jilin. The coupled TUFLOW-FV and Aquatic Ecodynamic (AED2) models were used to simulate the hydrodynamic and water quality of Chagan Lake, and propose the water diversion scheme that could improve the water quality to reach Grade III and maintain the ecological water level. The simulation results showed a satisfactory agreement with observations. The total carrying loads of NH3-N, total nitrogen (TN) and total phosphorus (TP) for Chagan Lake were 1,147.6, 3,686.2 and 100.8 t from May to October. The range of the minimum amounts of water diversion to keep the water quality as Grade III and maintain the maximum ecological water level of 131.5 m for TN, TP were separately [32.60, 49.84, 57.19, 63.70, 70.91], [117.25, 135.26, 168.17, 190.65, 218.32] million m3 and the corresponding reduction amounts of farmland drainage for TN, TP were separately [4.03, 0, 0, 0, 0], [73.08, 61.88, 50.23, 40.94, 31.98] million m3 under the rainfall guarantee rates of 10%, 20%, 50%, 75%, 90%, respectively. The simulation results provide a scientific basis for the water quality improvement and ecological water supplement required for the interconnected river–lake system network (IRLSN) in Western Jilin Province.

scholarly journals Research on Water Environment Regulation of Artificial Playground Lake Interconnected Yangtze River

2018 ◽  
Vol 15 (10) ◽  
pp. 2110 ◽  
Author(s):  
Weiwei Song ◽  
Xingqian Fu ◽  
Yong Pang ◽  
Dahao Song ◽  
Qing Xu ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Level ◽  
Yangtze River ◽  
Flood Control ◽  
Numerical Models ◽  
Rapid Development ◽  
Control Level ◽  
Water Environment ◽  
Water Diversion ◽  
Coupled Models

With the rapid development of China, water pollution is still a serious problem despite implementation of control measures. Reasonable water environment management measures are very important for improving water quality and controlling eutrophication. In this study, the coupled models of hydrodynamics, water quality, and eutrophication were used to predict artificial Playground Lake water quality in the Zhenjiang, China. Recommended “unilateral” and “bilateral” river numerical models were constructed to simulate the water quality in the Playground Lake without or with water diversion by pump, sluice and push pump. Under “unilateral” and “bilateral” river layouts, total nitrogen and total phosphorus meet the landscape water requirement through water diversion. Tourist season in spring and summer and its suitable temperature result in heavier eutrophication, while winter is lighter. Under pumping condition, water quality and eutrophication of “unilateral” river is better than “bilateral” rivers. Under sluice diversion, the central landscape lake of “unilateral river” is not smooth, and water quality and eutrophication is inferior to the “bilateral”. When the water level exceeds the flood control level (4.1 m), priority 1 is launched to discharge water from the Playground Lake. During operation of playground, when water level is less than the minimum level (3.3 m), priority 2 is turned on for pumping diversion or sluice diversion to Playground Lake. After opening the Yangtze river diversion channel sluice, priority 3 is launched for sluice diversion to the Playground Lake. When the temperature is less than 15 °C, from 15 °C to 25 °C and higher than 25 °C, the water quality can be maintained for 15 days, 10 days and 7 days, respectively. Corresponding to the conditions of different priority levels, reasonable choices of scheduling measures under different conditions to improve the water quality and control eutrophication of the Playground Lake. This article is relevant for the environmental management of the artificial Playground Lake, and similar lakes elsewhere.

scholarly journals Temporal and Spatial Changes of Non-Point Source N and P and Its Decoupling from Agricultural Development in Water Source Area of Middle Route of the South-to-North Water Diversion Project

2019 ◽  
Vol 11 (3) ◽  
pp. 895 ◽  
Author(s):  
Liguo Zhang ◽  
Zhanqi Wang ◽  
Ji Chai ◽  
Yongpeng Fu ◽  
Chao Wei ◽  
...  
Keyword(s):  
Point Source ◽  
Quantitative Estimation ◽  
Effective Means ◽  
Source Area ◽  
Water Source ◽  
Scientific Basis ◽  
Water Diversion ◽  
Nps Pollution ◽  
Water Diversion Project ◽  
North Water

The quantitative estimation of non-point source (NPS) pollution provides the scientific basis for sustainability in ecologically sensitive regions. This study combined the export coefficient model and Revised Universal Soil Loss Equation to estimate the NPS nitrogen (NPS-N) and NPS phosphorus (NPS-P) loads and then evaluated their relationship with Primary Industrial Output Value (PIOV) in the water source area of the middle route of South-to-North Water Diversion Project (SNWDP) for 2000–2015. The estimated results show that: (1) dissolved nitrogen (DN) load increased 0.55%, and dissolved phosphorus (DP) load decreased 4.60% during the 15 years. Annual loads of adsorbed nitrogen (AN) and adsorbed phosphorus (AP) increased significantly before 2005 and then decreased after 2005. Compared with 2000, AN and AP loads in 2015 significantly decreased by 32.72% and 30.81%, respectively. Hanzhong Basin and Ankang Basin are key areas for controlling dissolved pollution, and southern and northern regions are key areas for adsorbed pollution. (2) From 2000 to 2005, NPS pollutants and PIOV showed weak decoupling status. By 2015, NPS pollutants had strong decoupling from PIOV in most counties. (3) Land use has been the main source of NPS-N and NPS-P pollution, accounting for about 75% of NPS-N and 50% of NPS-P based on the average value over the study period. In the future, various measures—such as returning cropland to forest and reducing the number of livestock—could be adopted to reduce the risk of NPS pollution. NPS pollution caused by livestock was grown over the past 15 years and had not yet been effectively controlled, which still needs to be urgently addressed. Collecting ground monitoring data and revising parameters are effective means to improve the accuracy of simulation, which deserve further study. The results will also provide scientific support for sustainable development in similar regions.

Influence of Longitudinal Fluctuation in Long Corridor Surge Tank on Hydraulic Transients

2009 ◽  
Author(s):  
Jian Zhang ◽  
Weihua Lu ◽  
Xiaodong Yu ◽  
Yu Zheng
Keyword(s):  
Water Level ◽  
Influence Factors ◽  
High Water ◽  
Water Diversion ◽  
Width Ratio ◽  
Surge Tank ◽  
Hydraulic Transients ◽  
Length Width ◽  
Water Conveyance ◽  
Simulation Results

Since the length-width ratio of large long corridor surge tank is big, longitudinal flow appears obviously, which influences the safety of water diversion system. Based on the water conveyance system of hydropower station with long corridor surge tank, influence of longitudinal fluctuation on hydraulic transients is analyzed, which is contrasted with the results without consideration of longitudinal fluctuation, and corresponding model test is also carried out. It is shown that numerical simulation results, without consideration of longitudinal fluctuation, are more dangerous and those considering longitudinal fluctuation relatively conform to reality. Further more, influence factors on longitudinal fluctuation are studied, the bigger the length-width ratio of surge tank and the lower the operation water level, the severer the longitudinal fluctuation. In order to decrease longitudinal fluctuation, surge tank with small length-width ratio should be designed, and station should be operated on high water level as much as possible.

scholarly journals Research on the spread of pathogens-carrying water in the coastal aquaculture system

2021 ◽  
Vol 63 (6) ◽  
pp. 18-22
Author(s):  
Dinh Vuong Nguyen ◽  
◽  
Duc Thang Tang ◽  
Keyword(s):  
Sustainable Design ◽  
Irrigation System ◽  
Water Source ◽  
Scientific Basis ◽  
Shrimp Farming ◽  
Modeling Tool ◽  
Aquaculture System ◽  
Coastal Aquaculture ◽  
Fast Pace ◽  
Simulation Results

This paper presents the application of water source components theory in combination with the MIKE11 modeling tool (1D) to simulate the transport of pathogens-carrying water components in the coastal aquaculture system of Kien Giang province. The simulation results show that pathogens-carrying water spreads at a relatively fast pace and extensively in the system. Drainage schemes have also been proposed to control and minimise the spread of diseases. The application of water source components theory provides the scientific basis to ensure the rational and sustainable design of irrigation system for coastal shrimp-farming areas.

Fishpond Reconstruction Based on Water Quality Security for the East Route Project of Diverting Water from the South to the North of China—With an Example of Weishan County Shandong Province

2013 ◽  
Vol 448-453 ◽  
pp. 517-520
Author(s):  
Wan Xi Wang ◽  
Jian Qiang Zhu ◽  
Gu Li
Keyword(s):  
Water Quality ◽  
Pollution Control ◽  
Ecological Engineering ◽  
Water Source ◽  
Field Investigation ◽  
Shandong Province ◽  
Water Diversion ◽  
The South ◽  
The North ◽  
Common Problems

Weishan County gets its name for Weishan Lake, also known as Nansi Lakes because it consists of the four major lakes (Small Weishan, Zhaoyang, Dushan and Nanyang). Weishan Lake is an important water source in Shandong Province and one of the main impounded lakes in the East Route Project of Water Diversion from the South to the North. In order to ensure the water quality, the relevant cities and counties of Shandong Province attach great importance to water pollution control around the Weishan Lake. According to field investigation and analysis of present situation of the project area, common problems existed in pond culture along Weishan Lake were found out, meanwhile the targeted solutions for them were given aiming at the transformation of snakehead farming pond by ecological engineering, that focus on an establishment of the demonstration base so as to demonstrate a mode of aquiculture that is environmentally friendly, to enhance ecological health of aquiculture for sankeheaded, and to provide a strong guarantee for the East Route Project of Water Diversion from the South to the North to have a good water quality.

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