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E-Flow |
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by Hnin Phyu Sin | 01-07-2019 00:44
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1. Flow-ecology relationships
Flow regime vary spatially according to climate, geology and vegetation etc. Quantifying ecological responses to flow regime variation allows us to: (i) Understand and predict effects of human alteration to natural flows (ii) Inform targets for flow restoration and flow protection It can also contribute to environmentally sustainable water resource development and conservation of aquatic ecosystems. Approaches to quantify flow-ecology relationships Not only data which we can use but also other things can be applied in the places where the representative data or accurate data cannot easily achieve. 1. Expert opinion (e.g. conceptual models, literature reviews) Expert survey to rate fish species vulnerability to drought based on: ü Dispersal ability ü Distribution & abundance ü Reproductive capacity 2. Desktop studies (use existing data sets to correlate flow with biotic data) It is the prediction of the relationships between aquatic biodiversity and riverine flow regime attributes by using maps and chart. 3. Observational studies (correlate biotic data with flow from samples collected along flow gradients) It is the process of comparing the data of the biotic species and river flow patterns. 4. Flow-response experiments (monitor ecological responses to flow manipulations) Experimental manipulation of flow (e.g. downstream of dams) and monitoring ecological responses can help to quantify flow-ecology relationships and mechanisms. 2. Flow alteration and ecological impact Human activities can change natural flow regimes over a range of scales. The sources of flow alteration are water infrastructure such as dams, water extraction and land use etc. Dams alter patterns of flow variability. Responses to flow alteration are as shown in the attached picture. Ecological change is visually associated with flow alteration owing to findings. The risk of ecological change increases with increasing magnitude of flow alteration. Difficulty is not to know how this knowledge can be used to inform environmental flow management. Managers require strong links between hydrology and ecology with rules that can guide the management of flows. 3. Environmental flow management E-flow means the quantity, timing and quality of water flows required to sustain freshwater and estuarine ecosystems and the human livelihoods and well-being that depend upon these ecosystems. Although many scientists defined e-flow in many way, the main message is to make balance situation between human and the nature (river is the subject). E-flow assessments are an important step for decision-makers to evaluate tradeoffs among multiple competing users of water. E-flow assessment methods are varied based upon the purposes; · Assessment of current impacts on aquatic ecosystems from existing flow regime changes · Recommendation of specific flow volumes to maintain/restore aquatic ecosystems · Prediction of risks to aquatic ecosystems of future water use scenarios Assessment approaches · Hydrological : for making e-flow recommendations for maintaining river health at designated level. · Hydraulic rating : for key habitat factors limiting for particular biota (usually fish) · Habitat simulation : Assess e-flows on basis of modeling of quantity and suitability of physical habitat available to target species under different flow regimes · Holistic : identify important flow events for all major components of river, model relationships between flow and ecological, geomorphological and social responses, and use in interdisciplinary team approach to establish recommended e-flow regime/implications of flow scenarios. All things mentioned above are the scientific thinking of e-flow. In decision making, qualitative assessment by local people is also considerable thing and social survey should be made. The social result might be same or not with scientific results. As the benefits of local participation in e-flow are that indigenous people can get financial support, employment and knowledge about rivers. Building relationship with the local people in order to get trust and knowledge gaps are the challenging things. Also in Myanmar, we need to find reliable and sufficient data for managing the river in the best way. Of course, we must listen to the local’s sound and have to consider in our decision processes. |
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5 Comments
Hello Hnin
I do hope that you are fine and doing great with your works.
Thank you for your report about E Flow. It is an innovative concept and thanks for letting us know about it.
Green Cheers from Nepal :)
Keep writing great reports.
We are eager to read more reports from you.
Regards,
Kushal Naharki
Posted 24-07-2019 02:53
Hello hnin
E flow, great piece of report.
Thank you so much
Green cheers
Posted 13-07-2019 15:37
Hello Hnin Phyu Sin
Thank you for sharing such an informative and through report on E-flow. The concept of e-flow is very new to me. It seems that assessing e-flow makes it easier for decision makers to find a balance between protection of nature and economic development by providing reliable and practical data. This will be very helpful in enhancing the quality of local residents. I look forward to reading more reports form you.
Wonhee Mentor
Posted 03-07-2019 13:36
Hi Hnin,
Thank you for your efforts and time in writing this report about E-flow. I did not know there is such a term called E-flow before and thanks to you I learned a new thing tonight! Please keep up with the good work and I am looking forward to read more reports from you.
Louis Mentor
Posted 02-07-2019 21:03
Hey there Hnin!
I hope you are well this evening. Thank you for your article piece on e-flow. I am interested that its concept aims to link people so as to acquire information on knowledge gaps to better understand ecosystems, such as that of river tarrains.
Thank you for this article piece Hnin.
With gratitude,
Rosa
Posted 01-07-2019 04:43