scholarly journals Hydraulic method to determine the ecological flow for fish

2018 ◽  
Vol 246 ◽  
pp. 01110
Author(s):  
Jun Yan ◽  
Xuewei Fu ◽  
chengwei Tian ◽  
Zhenyu Yang ◽  
Qingyan Liu
Keyword(s):  
Reference Value ◽  
Water Requirement ◽  
Time And Space ◽  
Living Space ◽  
Hydraulic Method ◽  
Ecological Protection ◽  
Ecological Water Requirement ◽  
Social And Economic Development ◽  
Ecological Flow ◽  
Ecological Problems

Social and economic development will influence the nature environment and lead to ecological problems, among which the ecological flow concerns the food chain and fish populations. Although there are many computation formulas for counting ecological flow, it is very difficult to unite and get reasonable values. According to the existing research of ecological flow, the concept and calculation method of ecological flow are analyzed, which shows that in a complex ecological system, ecological water requirement is difficult to meet the requirements of all the protection object of water requirement at the same time. Therefore, we should focus on the specific fish with reference value to build ecological protection object and determine the ecological flow. Furthermore, the ecological flow should be the regulation of water quality and water quantity in time and space. Using hydraulic method, the fish living space under different water flow environments can be determined, and specific time and space regulation schemes can be obtained.

scholarly journals Calculation of Comprehensive Ecological Flow with Weighted Multiple Methods Considering Hydrological Alteration

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1212 ◽  
Author(s):  
Zhenxiang Xing ◽  
Yinan Wang ◽  
Xinglong Gong ◽  
Jingyan Wu ◽  
Yi Ji ◽  
...  
Keyword(s):  
Water Requirement ◽  
Hydrological Process ◽  
The Sanjiang Plain ◽  
Flow Calculation ◽  
Hydrological Alteration ◽  
Ecological Water Requirement ◽  
Study Results ◽  
Runoff Series ◽  
Ecological Flow ◽  
Calculation Results

Instream ecological flow is an essential determinant of river health. Intra- and interannual distribution characteristics of runoff have been altered to different degrees by dam construction. Historical runoff series with alterations, as basic data for ecological flow calculation, provide minimal instream hydrological process information, which affects the credibility of calculation results. Considering the influence of the alterations in runoff series on ecological flow calculation, the Gini coefficient (GI) is introduced to study the evenness degrees of the intra-annual runoff distribution of four hydrological stations located in the Naolihe basin of the Sanjiang Plain. The hydrological alteration diagnosis system is used to examine the alteration points in the GI series of each hydrological station for selecting reasonable subsequences. Based on the selected subsequences, the ecological flow of each station is calculated using three hydrological methods, and the comprehensive ecological flow is calculated using weighted calculation results from the three hydrological methods. The study results show that ecological flow and natural flow have similar processes with two peaks occurring in the process in May and August, respectively. Also, dams decrease the ecological water requirement damage frequency in dry seasons, but overuse of water resources increases the ecological water requirement damage frequency in flood seasons.

scholarly journals Ecological Water Requirement in Upper and Middle Reaches of the Yellow River Based on Flow Components and Hydraulic Index

2021 ◽  
Vol 18 (20) ◽  
pp. 10956
Author(s):  
Shibao Lu ◽  
Wenting Cai ◽  
Wei Shao ◽  
Farhad Taghizadeh-Hesary ◽  
Muhammad Faisal ◽  
...  
Keyword(s):  
Yellow River ◽  
Research Result ◽  
Water Requirement ◽  
Actual Condition ◽  
The Yellow River ◽  
Flow Process ◽  
Ecological Water Requirement ◽  
Ecological Flow ◽  
Flow Components ◽  
Regulation Model

Deterioration of the ecological environment in the upper and middle reaches of the Yellow River in China substantially impacts the growth and development of aquatic organisms in the drainage basin. This paper builds a conceptual model by applying flow components and fish ecological requirements relation with a relevant object of main fish in the upper and middle reaches of the Yellow River. The paper utilized the flow restoration method by employing the River2D model (two-dimensional model of river hydrodynamics and fish habitat), and a one-dimensional hydrodynamics HEC-RAS (hydrologic engineering center’s-river analysis system). The calculation result showed that the runoff condition required for Silurus lanzhouensis survival is that the monthly lowest flow in a year is 150 m3·s−1, and the lowest flow for suitable flow from April to October is 150 m3·s−1, and 300 m3·s−1 from November to March. The research result is closer to the actual condition and has more outstanding operability. Meanwhile, the results proposed the coupling method of ecological water requirement for the mainstream of the Yellow River. Moreover, the results portrayed the ecological flow process according to the upper envelope of minimum and maximum ecological water requirements of each fracture surface. It is regarded that the ecological flow process is deemed as the initial value of the reservoir regulation model.

scholarly journals WSPÓŁCZESNE UWARUNKOWANIA PLANOWANIA STRATEGICZNEGO ROZWOJU SPOŁECZNO-GOSPODARCZEGO MIASTA – WYBRANE ASPEKTY

2021 ◽  
Vol 36 ◽  
pp. 11-24
Author(s):  
Dorota Małgorzata Rynio
Keyword(s):  
Economic Development ◽  
Strategic Planning ◽  
City Management ◽  
Negative Effects ◽  
Strategic Development ◽  
Living Space ◽  
New Information ◽  
Social And Economic Development ◽  
The Times ◽  
The One

In the times of quick and widespread changes, innovations and new ways of city management, new approaches to planning of strategic development of urban entities are expected. Therefore there is a continuing search for possibilities of acquiring new information about the city market and ways to shape it, residents’ participation and involvement, and also creating city openness. Urban centres are not closed entities but they have strong relations with the local, domestic and global markets. There is a search for new directions and priorities in strategic planning of social and economic development, while the established goals follow consultations, workshops and meetings of various groups of urban stakeholders. The consequences of long-term implementation of a city’s image as open is, on the one hand, its recognisability, yet – on the other one – the experience of positive and negative effects of the implementation. The purpose of the study is to identify selected contemporary conditions of strategic planning of a city’s social and economic development, emphasising – in particular – the bases for creating a city’s openness, including the related opportunities and hazards. Another intention is to highlight innovative ways of collecting market information about needs and aspirations of city users, as well as to form the residents’ attitude towards their involvement in the development of their living space. The applied research methods include literature studies, benchmarking and reasoning.

Study on eco-environmental water requirement in the middle-reach oasis of Shulehe River Basin based on ecological protection target

2017 ◽  
Vol 37 (3) ◽  
Author(s):  
孙栋元 SUN Dongyuan ◽  
杨俊 YANG Jun ◽  
胡想全 HU Xiangquan ◽  
金彦兆 JIN Yanzhao ◽  
张云亮 ZHANG Yunliang
Keyword(s):  
River Basin ◽  
Environmental Water ◽  
Water Requirement ◽  
Middle Reach ◽  
Ecological Protection
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