Ecological water requirement based on ecological protection and restoration targets in the lower reaches of the Heihe River, northern China

2009 ◽  
Vol 4 (3) ◽  
pp. 263-270
Author(s):  
Li Zhang
Keyword(s):  
Northern China ◽  
Water Requirement ◽  
Heihe River ◽  
Restoration Targets ◽  
Ecological Protection ◽  
Ecological Water Requirement

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 Evaluation of the Effects of Land Cover Change on Ecosystem Service Values in the Upper Reaches of the Heihe River Basin, Northwestern China

2018 ◽  
Vol 10 (12) ◽  
pp. 4700 ◽  
Author(s):  
Minmin Zhao ◽  
Zhibin He
Keyword(s):  
Land Cover ◽  
Land Cover Change ◽  
River Basin ◽  
Ecosystem Service ◽  
Heihe River Basin ◽  
Northwestern China ◽  
Heihe River ◽  
Ecological Management ◽  
Ecological Protection ◽  
The Heihe River Basin

Ecological protection and restoration results in a series of complicated changes in land cover. Lack of research on the historical and potential effects of land cover change on ecosystem service value (ESV) hinders decision-making on trade-offs involved in environmental management. To address this gap, the effects of land cover change on ESV in the upper reaches of the Heihe River Basin in northwestern China were evaluated. First, on the basis of land cover maps for 2001, 2008 and 2015, the land cover map for 2029 was predicted with CA-Markov model. Then, the changes in ESV resulting from land cover change were valuated with the benefit transfer method. The results showed that the total ESV increased from $1207.33 million (USD) in 2001 to $1479.48 million (USD) in 2015, and the value was expected to reach $1574.53 million (USD) in 2029. The increase in ESV can be mainly attributed to expansion in areas of wetland. In this study, the elastic index was applied to identify areas that were more sensitive to ecological management, aiding in selecting sites for investment in ecological protection and restoration programs. Furthermore, the potential effects of land cover change on ESV was evaluated. The results are of great importance for guiding future ecological management.

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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