Impact assessment of anthropogenic interpositions on hydrological regimes of Godavari and Krishna River Basins, India

2020 ◽  
Author(s):  
Rahul Kumar Singh ◽  
Dr. Manoj Kumar Jain
Keyword(s):  
Flow Regime ◽  
Anthropogenic Activities ◽  
River Basins ◽  
Low Flow ◽  
Hydrologic Alteration ◽  
Riverine Ecosystems ◽  
Godavari River ◽  
Hydrological Alteration ◽  
Biotic Diversity ◽  
The Impact

<p>The rivers around the world have been transformed due to various anthropogenic activities and have led to the altered natural flow regime, which is crucial for controlling the essential environmental conditions within the river which in turn forms the biotic diversity. This study quantifies the adverse impacts due to the construction of dams on the hydrology of the Godavari and Krishna River Basins over the last half a century. The quantification of hydrologic alteration at five representative gauging stations of both the rivers has undertaken using Indicator of Hydrological Alteration (IHA) and the Flow Health (FH) methods based on the Range of Variability approach. To evaluate the alterations of flow regime due to the impact of dams (anthropogenic) only, the data for wet and dry years were excluded from the analysis as these represent the impact of climate variability. The IHA results reveal that the average monthly flow (especially from June to September), annual extreme streamflow indices (1-, 3-, and 7-day maxima flow), and rise and fall rates were among the most affected ones when compared to the pre-impacted period. The improved overall hydrologic alteration values for the Dhalegaon, Nowrangpur, K. Agraharam, and Vijayawada stations were found approximately 75.5%, 73.2%, 76.9 %, and 67.9 % respectively, suggesting a significant impact on the overall riverine ecosystem. The flow health (FH) analysis scores for high flow (HF) (K.Agraharam and Yadgir) highest monthly (HM) (Dhalegaon, K.Agraharam, and Yadgir), Low Flow (LF) (Dhalegaon) and flood flow intervals (FFI) (Dhalegaon and Vijayawada) during the test period were in the very high alteration range and these all hydrological indicator represents important ecological functions in both the rivers. The results showed in this study may guide in strategizing the multi-step process needed to improve the riverine ecosystems of Godavari and Krishna Basins and their ecological functioning.</p><p>Keywords: Hydrological alteration; Krishna River; Godavari River; Ecosystem</p>

scholarly journals Assessing flow regime alterations in a temporary river – the River Celone case study

2015 ◽  
Vol 63 (3) ◽  
pp. 263-272 ◽  
Author(s):  
Anna Maria De Girolamo ◽  
Antonio Lo Porto ◽  
Giuseppe Pappagallo ◽  
Francesc Gallart
Keyword(s):  
Flow Regime ◽  
Assessment Tool ◽  
Anthropogenic Activities ◽  
Swat Model ◽  
Reference Conditions ◽  
Hydrological Regime ◽  
Low Flow ◽  
Anthropogenic Pressures ◽  
Before And After ◽  
Temporary River

AbstractIn this paper, we present an approach to evaluate the hydrological alterations of a temporary river. In these rivers, it is expected that anthropogenic pressures largely modify low-flow components of the flow regime with consequences for aquatic habitat and diversity in invertebrate species. First, by using a simple hydrological index (IARI) river segments of the Celone stream (southern Italy) whose hydrological regime is significantly influenced by anthropogenic activities have been identified. Hydrological alteration has been further classified through the analysis of two metrics: the degree (Mf) and the predictability of dry flow conditions (Sd6). Measured streamflow data were used to calculate the metrics in present conditions (impacted). Given the lack of data from pristine conditions, simulated streamflow time series were used to calculate the metrics in reference conditions. The Soil and Water Assessment Tool (SWAT) model was used to estimate daily natural streamflow. Hydrological alterations associated with water abstractions, point discharges and the presence of a reservoir were assessed by comparing the metrics (Mf, Sd6) before and after the impacts. The results show that the hydrological regime of the river segment located in the upper part of the basin is slightly altered, while the regime of the river segment downstream of the reservoir is heavily altered. This approach is intended for use with ecological metrics in defining the water quality status and in planning streamflow management activities.

scholarly journals Zooplankton trajectory before, during and after a hydropower dam construction

2020 ◽  
Vol 32 ◽  
Author(s):  
Jaqueline Schmidt ◽  
Patrícia Dammski Borges de Andrade ◽  
André Andrian Padial
Keyword(s):  
Beta Diversity ◽  
Power Plants ◽  
Spatial Organization ◽  
Community Organization ◽  
Anthropogenic Activities ◽  
Hydroelectric Power ◽  
Aquatic Communities ◽  
Riverine Ecosystems ◽  
Compositional Changes ◽  
The Impact

Abstract: Aim Understanding the impact of anthropogenic activities is central for supporting management and conservation efforts. In aquatic ecosystems, the construction of dams for hydroelectric power plants is a major environmental change that turns the riverine ecosystem into a reservoir lake. Such environmental deep alteration causes profound impacts in biota. The goal of this study is to make a comprehensive description of zooplankton trajectory following the construction of a reservoir in the transition from the hotspot Cerrado to Amazon, Central Brazil. Methods We used data sampled before, during and after the formation of the reservoir lake in 10 sampling units each period. We evaluated compositional changes, shifts in spatial organization, and a variation in beta-diversity from before to after the dam constructions using a set of multivariate analyses. We evaluated effects for Rotifers, Copepods and Cladocerans separately. Results Compositional changes were evident for all zooplankton groups: Rotifers, Copepods and Cladocerans. Besides, spatial community organization was also affected but depending on the beta-diversity facet and data resolution – mainly turnover using abundance data, except for Copepods. Finally, an increase in nestedness occurred for all groups during the formation of the reservoir lake. Conclusions In summary, our study showed the deep impacts for zooplankton that the formation of a reservoir lake causes. We innovate by making a complete assessment, which indicate clearly the complexity of evidencing impacts in aquatic communities. We also suggest that long-term monitoring should continue in reservoirs for scientific purposes. The changes in biota also make clear that the construction of dams should be accompanied by preservation of other pristine riverine ecosystems.

scholarly journals Impact of Lake Gopło on low-flow regime of the upper Noteć river

2016 ◽  
Vol 16 (2) ◽  
pp. 95-103
Author(s):  
Edmund Tomaszewski
Keyword(s):  
Water Management ◽  
Flow Regime ◽  
Low Flow ◽  
Influence Of Water ◽  
Daily Discharge ◽  
The Impact

Abstract The main aim of this study is to make an assessment of the impact of Lake Gopło on a river low-flow regime. Two water gauges were selected, located in an upstream and downstream position to the lake on the River Noteć. On the basis of the daily discharge series from the period 1965–1990, a group of low-flow regime estimators was computed. Analyses involved various aspects of minimum flows and drought streamflow deficits. Comparison of the data between both gauging stations showed the extent of the influence of water management on Lake Gopło on low-flow regime transformation in the River Noteć.

scholarly journals Development of a revised method for indicators of hydrologic alteration for analyzing the cumulative impacts of cascading reservoirs on flow regime

2020 ◽  
Vol 24 (8) ◽  
pp. 4091-4107
Author(s):  
Xingyu Zhou ◽  
Xiaorong Huang ◽  
Hongbin Zhao ◽  
Kai Ma
Keyword(s):  
Flow Regime ◽  
Negative Impact ◽  
Rate Of Change ◽  
Low Flow ◽  
Outlet Section ◽  
Cumulative Impacts ◽  
Hydrologic Alteration ◽  
Jinsha River ◽  
Flow Part ◽  
Cascading Reservoirs

Abstract. The impacts of reservoirs, especially multiple reservoirs, on the flow regimes and ecosystems of rivers have received increasing attention. The most widely used metrics to quantify the characteristics of flow regime alterations are the indicators of hydrologic alteration (IHAs) which include 33 parameters. Due to the difference in the degree of alteration and the intercorrelation among IHA parameters, the conventional method of evaluating IHA parameters that assigns the same weight to each indicator is obviously inadequate. A revised IHA method is proposed by utilizing the projection pursuit (PP) and real-coded accelerated genetic algorithm (RAGA). Data reliability is analyzed by using the length of record (LOR) method. The projection values reflecting the comprehensive characteristics of the evaluation parameters are calculated. Based on these methods, a scientific and reliable evaluation of the cumulative impacts of cascading reservoirs on the flow regime was made by examining the Jinsha River. The results showed that with the increase in the number of reservoirs, the alteration degrees of IHA parameters gradually increased in groups 1, 2, 3 and 4 but decreased in group 5 (each group addresses the magnitude, timing, frequency, duration and rate of change in turn), and the flow duration curves showed a declining trend at the high-flow part and an increasing trend at the low-flow part. The flow regime alteration of the outlet section was more stable than before. This change had a negative impact on downstream fish reproduction and ecological protection. An attempt at ecological regulation was made to simulate the natural rising process of water, and four major Chinese carps have a positive response to the flood peak process caused by manual regulation.

scholarly journals The impact of stormwater source-control strategies on the (low) flow regime of urban catchments

2013 ◽  
Vol 69 (4) ◽  
pp. 739-745 ◽  
Author(s):  
Perrine Hamel ◽  
Tim D. Fletcher
Keyword(s):  
Flow Regime ◽  
Stormwater Management ◽  
Control Strategies ◽  
Management Strategies ◽  
Low Flow ◽  
Source Control ◽  
Control Techniques ◽  
Urban Catchments ◽  
Development Levels ◽  
The Impact

Stormwater management strategies increasingly recognise the need to emulate the pre-development flow regime, in addition to reducing pollutant concentrations and loads. However, it is unclear whether current design approaches for stormwater source-control techniques are effective in restoring the whole flow regime, and in particular low flows, towards their pre-development levels. We therefore modelled and compared a range of source-control stormwater management strategies, including some specifically tailored towards enhancing baseflow processes. The strategies were assessed based on the total streamflow volume and three low flow metrics. Strategies based on harvesting tanks showed much greater volume reduction than those based on raingardens. Strategies based on a low flow rate release, aimed at mimicking natural baseflow, failed to completely restore the baseflow regime. We also found that the sensitivity of the low flow metrics to the proportion of catchment treated varied amongst metrics, illustrating the importance of metrics selection in the assessment of stormwater strategies. In practice, our results suggest that realistic scenarios using low flow release from source-control techniques may not be able to fully restore the low flow regime, at least for perennial streams. However, a combination of feasibly-sized tanks and raingardens is likely to restore the baseflow regime to a great extent, while also benefitting water quality through the retention and filtration processes.

Potential flow regime alterations under climate change in an intermittent river system

2020 ◽  
Author(s):  
Anna Maria De Girolamo ◽  
Antonio Lo Porto
Keyword(s):  
Climate Change ◽  
Flow Regime ◽  
River System ◽  
Low Flow ◽  
Annual Rainfall ◽  
Slight Reduction ◽  
Future Scenarios ◽  
Daily Streamflow ◽  
The Impact ◽  
Intermittent River

<p>The potential impact of climate change on the flow regime was analyzed for the Celone River, an intermittent river system in the Apulia Region (S_E, Italy). Rainfall and temperature recorded in the past century were analyzed. Flow regime under climate projections for the future (2030–2059) and for the recent conditions (1980–2009) were compared. The Soil and Water Assessment Tool, a hydrological model, was used to simulate daily streamflow in selected river sections.</p><p>Daily climate data used to simulate future scenarios were obtained by a combination of a global circulation model (GCM, ECHAM5) and different regional models (RACMO2; RCA; REMO). The impact on the hydrological regime was estimated as a deviation from the baseline (1980–2009) by using a number of indicators of hydrological alterations.</p><p>From 1919 to 2012, a slight reduction in total annual rainfall and a decrease of the number of rainy days was recorded, hence, an increase in extreme rainfall events. From 1954 to 2012, the minimum daily temperature in January and February increased reducing the snowfall.</p><p>Under future scenarios, an increase in mean temperature was predicted for all months between 0.5–2.4 °C and a reduction in precipitation (by 4–7%). As a consequence, the flow regime moves towards drier conditions and the divergence of the flow regime from the current conditions increases in future scenarios, especially for those reaches classified as I‐D (ie, intermittent‐dry) and E (ephemeral).</p><p>Hydrological indicators showed an extension of the dry season and an exacerbation of the extreme low flow conditions with a decrease in both high flow and low flow magnitudes for various time durations. These changes are expected to have several implications for river ecosystems that have to be considered in River Basin Management and Planning.</p>

scholarly journals Evaluation of Reservoir-Induced Hydrological Alterations and Ecological Flow Based on Multi-Indicators

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2069 ◽  
Author(s):  
Mingqian Li ◽  
Xiujuan Liang ◽  
Changlai Xiao ◽  
Xuezhu Zhang ◽  
Guiyang Li ◽  
...  
Keyword(s):  
Hydrological Regime ◽  
Ecological Indicators ◽  
Shannon Index ◽  
Low Flow ◽  
Ecological Diversity ◽  
Human Beings ◽  
Hydrologic Alteration ◽  
Flow Duration ◽  
The Impact ◽  
The Relationship

Although they fulfill various needs of human beings, reservoirs also cause hydrological regime variation in the downstream regions, thus affecting ecological diversity. Therefore, studying the reservoir-induced hydrological alterations and ecological effects is of great significance, as it could guide the regulation of the reservoir to protect the river ecology. In this study, taking the Taizi River as an example, the impact of a reservoir on hydrological alteration and ecological diversity was comprehensively evaluated through eco-flow indicators based on the flow duration curve and multiple hydrological indicators. The results reveal that: (1) Ecological indicators can be used to analyze the annual and seasonal changes in the streamflow after the construction of the reservoir. The high-flow values and frequency decrease after the construction of the reservoir, especially in the autumn, while the low-flow component values increase significantly, especially in spring and summer. (2) The main influencing factors of the ecological indicators can be reflected by the relationship with precipitation, as the annual ecosurplus is not significantly affected by the reservoir, while the ecodeficit is greatly affected, and the seasonal ecological indicators (especially in spring and summer) are greatly affected by the reservoir. (3) The indicators of hydrologic alteration (IHA) show significant changes after the construction of the reservoir and are consistent with the changes in the eco-flow indicators; the change in the Shannon index indicates that the ecological diversity reduced after construction of the reservoir. It is controlled by the reservoir, and a new equilibrium state appears. (4) The eco-flow indicators have a good correlation with the 32 IHAs; they can reflect the change information of most IHAs and can avoid statistical redundancy.

The impact of climate change on water provision under a low flow regime: A case study of the ecosystems services in the Francoli river basin

2013 ◽  
Vol 263 ◽  
pp. 224-232 ◽  
Author(s):  
Montse Marquès ◽  
Rubab Fatima Bangash ◽  
Vikas Kumar ◽  
Richard Sharp ◽  
Marta Schuhmacher
Keyword(s):  
Climate Change ◽  
Flow Regime ◽  
River Basin ◽  
Low Flow ◽  
Impact Of Climate Change ◽  
Water Provision ◽  
The Impact

Flow regime variation in Arctic rivers

2020 ◽  
Author(s):  
Nasim Fazel ◽  
Ali Torabi Haghighi ◽  
Kabir Rasouli ◽  
Bjørn Kløve
Keyword(s):  
Climate Change ◽  
Flow Regime ◽  
Anthropogenic Activities ◽  
Flow Regimes ◽  
The Arctic ◽  
Hydro Power ◽  
Stream Flows ◽  
Arctic Rivers ◽  
Thawing Permafrost ◽  
The Impact

<p>Arctic rivers’ flow regime has changed under climate change and its consequences on melting glaciers, thawing permafrost, and precipitation patterns. Reservoirs, hydro-power sites, and water diversions have also changed flow regimes in the Arctic. The flow regime alteration in the Arctic rivers has a strong influence on the conservation and sustainability of the native biodiversity of the riverine ecosystem. The main objective of this paper is to evaluate changes in the (1) magnitude of monthly stream flows, (2) magnitude and duration of annual maxima and minima flows, (3) timing of annual maxima and minima, (4) frequency and duration of high and low pulses, and (5) rate and frequency of daily flows in seven major Arctic Rivers. The analyses provide an important basis to characterize and understand the influence of climate change and anthropogenic activities on the flow regimes in the Arctic. Streamflow observations were obtained from the outlet of the Lena, Yenisei, Kolyma, Ob (Russia), Yukon (USA and Canada), Mackenzie (Canada), and Tana (Norway and Finland) rivers in this study. These rivers are main freshwater suppliers for Arctic Ocean. Of these, five have been regulated and two are considered pristine rivers. In addition, the impact of 16 reservoirs on flow regime in the headwaters and tributaries of Lena, Yenisei, Mackenzie, and Kolyma were evaluated. The annual flow showed an increasing trend in all rivers and with a statistically significant level in Yenisei, Lena, and Mackenzie. Our results also indicated that changes in the observed flow regimes at the outlet stations vary from low to incipient level. Out of 16 reservoirs that were analyzed for flow regimes changes, construction of Krasnoyarsk and Shushenskaya dams on the Yenisei River showed the highest impact on flow regime and flow regime alteration was classified as severe in this river.</p>

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