scholarly journals The Ecological Water Demand of Schizothorax in Tibet Based on Habitat Area and Connectivity

2019 ◽  
Vol 16 (17) ◽  
pp. 3045
Author(s):  
Zili Zhou ◽  
Yun Deng ◽  
Yong Li ◽  
Ruidong An
Keyword(s):  
Water Demand ◽  
Aquatic Organisms ◽  
Field Investigation ◽  
Spawning Period ◽  
Cover Type ◽  
Ecological Water Demand ◽  
Suitability Index ◽  
River Hydrology ◽  
Flow Demand ◽  
Suitable Habitats

Water resource regulation is convenient for humans, but also changes river hydrology and affects aquatic ecosystems. This study combined a field investigation and two-dimensional hydrodynamic model (MIKE21) to simulate the hydrodynamic distribution from 1 March to 30 April of 2008–2013 and establish the HDI (habitat depth suitability index) and HVI (habitat velocity suitability index) based on static hydraulic conditions at typical points. Additionally, by using MIKE21 to simulate the hydraulic state in the study area under 20 flow conditions from 530–1060 m3/s, and combining these states with the HCI (habitat cover type suitability index), HDI, and HVI, we simulated the WUA (weighted usable area) and habitat connectivity under different runoff regulation scenarios to study the water requirements of Schizothorax during the spawning period in the Yanni wetland. The results showed the following: (1) the suitable cover type was cobble and rock substrate, with nearby sandy land; furthermore, the suitable water depth was 0.5–1.5 m, and the suitable velocity was 0.1–0.9 m/s. (2) Using the proximity index to analyse the connectivity of suitable habitats, the range of ecological discharge determined by the WUA and connectivity was 424–1060 m/s. (3) Habitat quality was divided into three levels to detail the flow demand further. When the flow was 424–530 m3/s or 848–1060 m3/s, the WUA and connectivity generally met the requirements under natural conditions. When the flow was 530–636 m3/s or 742–848 m3/s, the WUA and connectivity were in a good state. When the flow was 636–742 m3/s, the WUA and connectivity were in the best state. This study complements existing research on the suitability of Schizothorax habitat in Tibet, and introduces the connectivity index to enrich the method for calculating ecological water demand, providing a reference for resource regulation and the protection of aquatic organisms.

Research on the Ecological Water Demand Based on Physical Habitat Simulation Model

2014 ◽  
Vol 1022 ◽  
pp. 376-379
Author(s):  
Jun Xian Chen ◽  
Rui Zhi Qiao ◽  
Wen Hua Li ◽  
Xin Wen
Keyword(s):  
Life Cycle ◽  
Water Demand ◽  
Southwest China ◽  
Aquatic Organisms ◽  
Habitat Model ◽  
Environmental Benefits ◽  
Physical Habitat ◽  
Ecological Water Demand ◽  
Ecological Flow ◽  
Habitat Simulation

A basin in Southwest China is selected as an example for ecological water demand calculation to obtain the ecological flow required for the survival of typical creatures within the watershed by solving the physical habitat model. The implementation of ecological operation can better meet the two fish suitable ecological needs for each life cycle, and is of great significance for fish conservation. Results indicate that the implementation of ecological operation has tremendous ecological environmental benefits and great significance for the protection of aquatic organisms.

scholarly journals Study on the Ecological Operation and Watershed Management of Urban Rivers in Northern China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 914 ◽  
Author(s):  
Guangyi Deng ◽  
Xiaohan Yao ◽  
Haibo Jiang ◽  
Yingyue Cao ◽  
Yang Wen ◽  
...  
Keyword(s):  
Water Quality ◽  
Watershed Management ◽  
Water Demand ◽  
Reservoir Operation ◽  
Northern China ◽  
Ecological Function ◽  
Ecological Environment ◽  
Physical Habitat ◽  
Urban Rivers ◽  
Ecological Water Demand

Small- and medium-sized rivers are facing a serious degradation of ecological function in water resource-scarce regions of Northern China. Reservoir ecological operation can restore the damaged river ecological environment. Research on reservoir ecological operation and watershed management of urban rivers is limited in cold regions of middle and high latitudes. In this paper, the urban section of the Yitong River was selected as the research object in Changchun, Northern China. The total ecological water demand and reservoir operation water (79.35 × 106 m3 and 15.52 × 106 m3, respectively) were calculated by the ecological water demand method, and a reservoir operation scheme was established to restore the ecological function of the urban section of the river. To examine the scientific basis and rationality of the operation scheme, the water quality of the river and physical habitat after carrying out the scheme were simulated by the MIKE 11 one-dimensional hydrodynamic-water quality model and the Physical Habitat Simulation Model (PHABSIM). The results indicate that the implementation of the operation scheme can improve the ecological environment of the urban section of the Yitong River. A reform scheme was proposed for the management of the Yitong River Basin based on the problems in the process of carrying out the operation schemes, including clarifying department responsibility, improving laws and regulations, strengthening service management, and enhancing public participation.

Analysis of Ecological Water Demand and Measures of Ecological Comprehensive Management in the Downstream of Heihe River

2012 ◽  
Vol 518-523 ◽  
pp. 4967-4971
Author(s):  
Li Bin Yang ◽  
Qiang Huang ◽  
Yu Wang ◽  
Yong Yong Zhang ◽  
Jing Meng
Keyword(s):  
Water Demand ◽  
Practical Significance ◽  
Ecological Environment ◽  
Heihe River ◽  
Comprehensive Treatment ◽  
Ecological Health ◽  
Comprehensive Management ◽  
Water Demands ◽  
Ecological Water Demand ◽  
The Heihe River Basin

In order to maintain the optimum ecological health for the downstream of Heihe River, it is necessary to analyze the ecological water demand in the downstream of Heihe River respectively from two aspects that artificial and natural ecological water demand, then the ecological water demands in the downstream of Heihe River of current situation and 2015 are determined in this paper, which are 962 million and 1.048 billion cubic metres. At the same time, some integrated measures for repairing and improving ecology for the downstream of Heihe River, including ecological water transporting project, ecological restoration project and ecological immigrant project, etc., are put forward in this paper, so as to guarantee the ecological safe for the downstream of Heihe River. Overall, all of these have the important practical significance for protecting the local ecological environment, supporting the local sustainable economic and society development, and guiding comprehensive treatment of the Heihe River basin.

Study on Off-Stream Ecological Water Demand of Fu River Basin

2014 ◽  
Vol 641-642 ◽  
pp. 92-96
Author(s):  
Fa Lei Wang ◽  
Wei Hu
Keyword(s):  
River Basin ◽  
Water Conservation ◽  
Water Demand ◽  
Green Space ◽  
Sewage Treatment ◽  
Scientific Basis ◽  
Soil And Water Conservation ◽  
Ecological Water Demand ◽  
Public Green Space ◽  
Soil And Water

According to researches on mechanism and concept of off-stream ecological water demand, off-stream ecological water demand of Fu River Basin is consist of ecological water demand for soil and water conservation and for urban public green space, considering the current situation and planning objectives of off-stream ecological water demand of Fu River Basin. Directly calculation method is employed in this study. Choosing 2005 as the current year in this study, indicators of public green space and soil erosion data are obtained. Then the ecological water demand of urban public green space in Fuzhou City is determined as 0.438×108m3 and the water demand for off-stream soil and water conservation in Fu River Basin is determined as 0.3159×108m3 in virtue of quota method. The off-stream ecological water demand in the Basin (2005 as the current year) is about 0.359×108m3. The determination of the off-stream ecological water demand in the basin provide a scientific basis on taking a variety of water-saving measures, improving the recovery rate of sewage treatment and increasing the off-stream ecological water consumption. Results of this study will make the ecological environment of this area to achieve a healthy state, and shall greatly improve regional water resources and water environmental situation.

Combined Impacts of Sand Mining Activities: The Nandu River Downstream Segment

2013 ◽  
Vol 671-674 ◽  
pp. 3134-3137 ◽  
Author(s):  
Shu Wei Jiang ◽  
Abuduhelili Haibier ◽  
Yong Xin Wu
Keyword(s):  
Water Environment ◽  
Aquatic Organisms ◽  
Field Investigation ◽  
Hydrodynamic Characteristics ◽  
Social Stability ◽  
Mining Activities ◽  
Sand Mining ◽  
Natural Evolution ◽  
River Sand ◽  
Downstream Section

With the accelerated pace of urban construction in Hainan province, demand for building sand increased rapidly, river sand prices soared. This led to the illegal and unauthorized sand mining continue to emerge at Nandu River downstream segment. The current sand mining situation of Nandu River downstream section was expounded. The various impacts of sand mining activities on river regime, flood safety, hydrodynamic characteristics of the river, development of delta and water environment have been studied according to measured data and results of field investigation. It is shown that sand mining activities undermines the natural evolution of the river regime; affects the habitat of fish and other aquatic organisms. Water level drops, water velocity decreases, and the Nandu Rive delta coastline retrogrades due to sand extraction. Besides, sand mining has an obvious adverse impact on infrastructures, waterway safety and social stability.

scholarly journals Hydrological Restoration and Water Resource Management of Siberian Crane (Grus leucogeranus) Stopover Wetlands

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1714 ◽  
Author(s):  
Haibo Jiang ◽  
Chunguang He ◽  
Wenbo Luo ◽  
Haijun Yang ◽  
Lianxi Sheng ◽  
...  
Keyword(s):  
Resource Management ◽  
Water Supply ◽  
Water Resource ◽  
Water Demand ◽  
Water Resource Management ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Siberian Crane ◽  
Ecological Water Demand

Habitat loss is a key factor affecting Siberian crane stopovers. The accurate calculation of water supply and effective water resource management schemes plays an important role in stopover habitat restoration for the Siberian crane. In this paper, the ecological water demand was calculated and corrected by developing a three-dimensional model. The results indicated that the calculated minimum and optimum ecological water demand values for the Siberian crane were 2.47 × 108 m3~3.66 × 108 m3 and 4.96 × 108 m3~10.36 × 108 m3, respectively, in the study area. After correction with the three-dimensional model, the minimum and optimum ecological water demand values were 3.75 × 108 m3 and 5.21 × 108 m3, respectively. A water resource management scheme was established to restore Siberian crane habitat. Continuous, area-specific and simulated flood water supply options based on water diversions were used to supply water. The autumn is the best season for area-specific and simulating flood water supply. These results can serve as a reference for protecting other waterbirds and restoring wetlands in semi-arid areas.

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