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Journal articles on the topic 'Annual flow'

Author: Grafiati

Published: 1 June 2024

Last updated: 31 July 2025

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1

Woo, Ming‐Ko, and Peter R. Waylen. "Interbasin Water Transfers and the Régimes of Three Northwestern Ontario Rivers." Canadian Geographies / Géographies canadiennes 32, no. 4 (1988): 319–27. http://dx.doi.org/10.1111/j.1541-0064.1988.tb00019.x.

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Runoff régimes of three northwestern Ontario river systems undergoing interbasin transfer of water were compared to the natural flow patterns of neighbouring rivers. Long‐term diversion effects can be identified by analysing the probability distributions of annual runoff, annual floods, and annual low flows, representing mean, maximum, and minimum flow conditions of each year, respectively. Rivers exporting water have reduced annual flow and highly variable peak runoff, accompanied by high probability of zero low flow. Rivers importing water exhibit smaller variations of annual flow and peak f

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2

Wang, Wen, Xiao-Gang Wang, and Xuan Zhou. "Impacts of Californian dams on flow regime and maximum/minimum flow probability distribution." Hydrology Research 42, no. 4 (2011): 275–89. http://dx.doi.org/10.2166/nh.2011.137.

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Dams have major impacts on river hydrology with a general tendency to decrease annual maximum flows and increase annual minimum flows. The analysis of 41 streamflow series in California, USA are examined, and the results show that, as expected, the mean values and variations of annual peak flows and maximum flows of different durations are reduced for almost all sites after dam use, and the larger the ratio of total reservoir capacity to pre-dam annual runoff, the larger the rate of peak flow reduction. However, the impacts on minimum flow are mixed. For five out of seven cases with long data

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Nuriyev, A. A. "ŞİRVAN ÇAYLARININ AXIMININ ÇOXİLLİK TƏRƏDDÜDLƏRİ." “Water Problems: science and technologies” 1, no. 1 (2021): 38–45. http://dx.doi.org/10.30546/wtst.2020.1.38.

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Abstract. The article is devoted to the analysis of long-term fluctuations of the annual flow of the Shirvan rivers. The analysis used data from 4 rivers with an observation period of more than 50 years. linear trends were identified in the observation series, and their significance was assessed. The annual water discharge observations are divided into two series, covering 1961-1990 and 1991-2018. The dynamics of annual precipitation data of meteorological observation stations located in the study area were also analyzed. Annual precipitation increased in Goychay and Ismayilli meteorological s

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4

Georgiadi, Alexander G., Irina P. Milyukova, Oleg O. Borodin, and Artyom V. Gusarov. "Water Flow Changes In The Don River (European Russia) During 1891–2019." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 16, no. 2 (2023): 6–17. http://dx.doi.org/10.24057/2071-9388-2022-083.

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The Don River Long near Razdorskaya Village had long phases (lasting 33–86 years) of increased/decreased naturalized annual and seasonal water flow, and their properties for 1891–2019 were identified. Long-term changes in the annual and snow-melt flood flow occurred in the opposite phase relative to changes in the winter and summer-autumn flow. Annual hydrographs in the phase of decreased flow were characterized by an increase in water discharge during the low-water seasons of the year, but a noticeable decrease in daily flood water discharge and maximum water discharge. The share of high-wate

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Suwal, Naresh, Alban Kuriqi, Xianfeng Huang, João Delgado, Dariusz Młyński, and Andrzej Walega. "Environmental Flows Assessment in Nepal: The Case of Kaligandaki River." Sustainability 12, no. 21 (2020): 8766. http://dx.doi.org/10.3390/su12218766.

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Environmental flow assessments (e-flows) are relatively new practices, especially in developing countries such as Nepal. This study presents a comprehensive analysis of the influence of hydrologically based e-flow methods in the natural flow regime. The study used different hydrological-based methods, namely, the Global Environmental Flow Calculator, the Tennant method, the flow duration curve method, the dynamic method, the mean annual flow method, and the annual distribution method to allocate e-flows in the Kaligandaki River. The most common practice for setting e-flows consists of allocati

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Georgiadi, A. G., I. P. Milyukova, E. A. Barabanova, and Yu Yu Alentyev. "Features of the Yenisei River long phases of increased/decreased water flow (downstream from the confluence of the Angara River)." Hydrometeorological research and forecasting 3 (October 18, 2024): 124–41. http://dx.doi.org/10.37162/2618-9631-2024-3-124-141.

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The article presents the results of studying long phases of decreased and increased conditionally natural annual and seasonal water flow of the Yenisei River at Kyzyl Сity, Nikitino and Bazaikha settlements. The retrieval of long-term water flow time series (with excluded anthropogenic changes) at Nikitino and Bazaikha settlements is based on the transformation of the annual hydrograph of daily water discharges using the Kalinin–Milyukov method. Long phases of annual and seasonal water flow were revealed on the basis of cumulative deviations curves. For the entire observation period of 1936–20

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Pastor, A. V., F. Ludwig, H. Biemans, H. Hoff, and P. Kabat. "Accounting for environmental flow requirements in global water assessments." Hydrology and Earth System Sciences Discussions 10, no. 12 (2013): 14987–5032. http://dx.doi.org/10.5194/hessd-10-14987-2013.

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Abstract. With growing water needs for food production, it is necessary to improve the quantification of "Environmental Flow Requirements (EFRs)" to secure enough water for the freshwater ecosystems. In this study, five methods for calculating EFRs were compared to 11 case studies of locally-calculated EFRs. Three of the methods already existed (Smakhtin, Tennant and Tessmann) and two were developed in this study (the Variable Monthly Flow method and the Q90_Q50 method). The Variable Monthly Flow (VFM) method mimics for the first time the natural flow regimes while being "validated" at global

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Rostami, Sajjad, Jianxun He, and Quazi K. Hassan. "Water quality response to river flow regime at three major rivers in Alberta." Water Quality Research Journal 55, no. 1 (2019): 79–92. http://dx.doi.org/10.2166/wqrj.2019.033.

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Abstract Both anthropogenic activities and natural factors affect river water in quantity and quality, while anthropogenic activities have been often blamed to cause water quality temporal degradation. In addition, riverine water quality displays intra-annual/seasonal variations, which are often more prominent than inter-annual variations. The intra-annual variations in water quality, which are attracting the attention of managers and policy-makers, beg the question of how to better manage riverine water quality at a finer time resolution. The natural factors, in particular, the hydro-meteorol

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Arefiev, N. V., N. S. Bakanovichus, A. A. Lyalina, et al. "Development of an Automated Approach for Updating of the Annual Runoff Module Map." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (June 17, 2015): 35. http://dx.doi.org/10.17770/etr2015vol2.259.

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<p>Several Russian Hydropower Design and Research Institutes have recently fulfilled studies of hydropower potential estimation for NorthWest, Caucasian and Angara River’s regions in Russia. An approach to automate the calculation of river flow characteristics, based on the usage of annual flow rate map, was proposed and tested by the authors for the aims of the studies.</p><p>Annual river flow characteristics together with the terrain data are the most important data sources for evaluation of the hydropower potential.</p><p>A set of requirements was made for the

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10

Hughes, JMR, and B. James. "A hydrological regionalization of streams in Victoria, Australia, with implications for stream Ecology." Marine and Freshwater Research 40, no. 3 (1989): 303. http://dx.doi.org/10.1071/mf9890303.

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Annual, monthly, low and peak flow data were used to classify and ordinate 138 stream gauges in Victoria. Sixteen hydrological variables were used and low-flow and entire-flow regionalizations were derived. The low-flow regionalization was spatially indistinct and therefore unusable, but the entire-flow regionalization produced five distinctive and spatially significant regions. Least-squares relationships were calculated between mean annual runoff, catchment area and coefficient of variation of annual flows, and the 16 variables. Rivers in the dry western districts of Victoria exhibit high va

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Chen, Rongchang, Chen Liu, Xiaofeng Luo, and Wei Shen. "Numerical Simulation Study of Booming Effect in Fast Currents of Inland River." E3S Web of Conferences 38 (2018): 03048. http://dx.doi.org/10.1051/e3sconf/20183803048.

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In the downstream tidal section of the Yangtze River, nine kinds of combinations of hydrological environmental conditions are considered, including the annual average runoff flow, the annual average peak flow and the flood control design flow, as well as the three conditions of spring, medium and neap tides. By means of the numerical simulation method, the effective performance parameter values for conventional intercepting boom under different environmental conditions are obtained by simulating 9 kinds of maximum current speed to withstand, Max.CS, respectively. The results show that, in the

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12

Burgan, Halil Ibrahim, and Hafzullah Aksoy. "Annual flow duration curve model for ungauged basins." Hydrology Research 49, no. 5 (2018): 1684–95. http://dx.doi.org/10.2166/nh.2018.109.

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AbstractA flow duration curve (FDC) plots the percentage of time that flow in a stream is equal to or exceeding a given value. In a gauged basin, it is obtained by sorting the observed flow from the largest to the smallest, and plotting against the corresponding exceedance probability. At ungauged basins where no data exist, the need for developing empirical methods emerges. This study aims at developing an FDC model for ungauged basins. The model is based on the normalized nondimensional annual mean flow quantiles. The annual mean flow is empirically calculated by a regression equation that t

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13

Horn, Dennis R. "Annual Flow Statistics for Ungaged Streams in Idaho." Journal of Irrigation and Drainage Engineering 114, no. 3 (1988): 463–75. http://dx.doi.org/10.1061/(asce)0733-9437(1988)114:3(463).

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Tiwari, Harinarayan, Subash Pd Rai, Nayan Sharma, and Dheeraj Kumar. "Computational approaches for annual maximum river flow series." Ain Shams Engineering Journal 8, no. 1 (2017): 51–58. http://dx.doi.org/10.1016/j.asej.2015.07.016.

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15

Gudmundsson, Gudmundur. "Disaggregation of annual flow data with multiplicative trends." Journal of Forecasting 18, no. 1 (1999): 33–37. http://dx.doi.org/10.1002/(sici)1099-131x(199901)18:1<33::aid-for687>3.0.co;2-t.

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16

Liu, Shuiqing, Zuhao Zhou, Jiajia Liu, et al. "Analysis of the Runoff Component Variation Mechanisms in the Cold Region of Northeastern China under Climate Change." Water 14, no. 19 (2022): 3170. http://dx.doi.org/10.3390/w14193170.

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Climate change alters hydrological processes in cold regions. However, the mechanisms of runoff component variation remain obscure. We implemented a WEP-N model to estimate monthly runoff in the Songhua River Basin (SRB) between 1956 and 2018. All flow simulations were accurate (NSE > 0.75 and RE < 5%). The annual runoff was attenuated in 1998, and the hydrological series (1956–2018) was divided into base and change periods in that year. Relative to the BS (base scenario), annual production flow reduction was −28.2% under climate change and water use. A multifactor attribution analysis s

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17

Adlul Islam, Alok K Sikka, B Saha, and Anamika. "Modelling Sensitivity of Stream flow to Climate Change in the Brahmani River Basin." Journal of Agricultural Engineering (India) 46, no. 4 (2009): 49–53. http://dx.doi.org/10.52151/jae2009464.1393.

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It is widely accepted that increasing concentration of greenhouse gases in the atmosphere is causing climate change, which may alter the hydrologic cycle and regional water availability. Hydrological modelling to assess the sensitivity of stream flow in the Brahmani basin to different hypothetical climate change scenarios indicated significant changes in mean monthly stream flow. Simulation results indicated 76% increase in annual stream flow with a 30% increase in rainfall and no change in temperature, and a maximum decrease of 33% in annual stream flow with 4°C increase in temperature and 10

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18

Xu, Zhicheng, Lei Cheng, Peng Luo, et al. "A Climatic Perspective on the Impacts of Global Warming on Water Cycle of Cold Mountainous Catchments in the Tibetan Plateau: A Case Study in Yarlung Zangbo River Basin." Water 12, no. 9 (2020): 2338. http://dx.doi.org/10.3390/w12092338.

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Global warming has a profound influence on global and regional water cycles, especially in the cold mountainous area. However, detecting and quantifying such changes are still difficult because noise and variability in observed streamflow are relatively larger than the long-term trends. In this study, the impacts of global warming on the catchment water cycles in the Yarlung Zangbo River Basin (YZRB), one of most important catchments in south of the Tibetan Plateau, are quantified using a climatic approach based on the relationship between basin-scale groundwater storage and low flow at the an

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19

Chen, Xiaohong, Lijuan Zhang, C. Y. Xu, Jiaming Zhang, and Changqing Ye. "Hydrological Design of Nonstationary Flood Extremes and Durations in Wujiang River, South China: Changing Properties, Causes, and Impacts." Mathematical Problems in Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/527461.

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The flood-duration-frequency (QDF) analysis is performed using annual maximum streamflow series of 1–10 day durations observed at Pingshi and Lishi stations in southern China. The trends and change point of annual maximum flood flow and flood duration are also investigated by statistical tests. The results indicate that (1) the annual maximum flood flow only has a marginally increasing trend, whereas the flood duration exhibits a significant decreasing trend at the 0.10 significant level. The change point for the annual maximum flood flow series was found in 1991 and after which the mean maxim

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20

Hulley, Mike, Colin Clarke, and Ed Watt. "Low flow frequency analysis for stream with mixed populations." Canadian Journal of Civil Engineering 42, no. 8 (2015): 503–9. http://dx.doi.org/10.1139/cjce-2014-0323.

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A methodology is developed for the estimation of annual low-flow quantiles for streams with annual low flows occurring in both the summer and winter. Since the low flow generating processes are different in summer and winter, independent seasonal analyses are required. The methodology provides recommendations for assessment of record length, randomness, homogeneity, independence and stationarity, as well as guidelines for distribution selection and fitting for seasonal distributions. The seasonal distributions are then used to develop the combined distribution for annual low flow estimation. F

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Zhukov, Igor, Nickolay Pechurin, Lyudmila Kondratova, and Sergey Pechurin. "GDP in Value as a Measure for Evaluating Annual Data Flow Increase on IoT." Advances in Cyber-Physical Systems 4, no. 2 (2019): 137–42. http://dx.doi.org/10.23939/acps2019.02.137.

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22

Courtillot, Vincent, Jean-Louis Le Mouël, Fernando Lopes, and Dominique Gibert. "On the Nature and Origin of Atmospheric Annual and Semi-Annual Oscillations." Atmosphere 13, no. 11 (2022): 1907. http://dx.doi.org/10.3390/atmos13111907.

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This paper proposes a joint analysis of variations of global sea-level pressure (SLP) and of Earth’s rotation (RP), expressed as the coordinates of the rotation pole (m1, m2) and length of day (lod). We retain iterative singular spectrum analysis (iSSA) as the main tool to extract the trend, periods, and quasi periods in the data time series. SLP components are a weak trend, seven quasi-periodic or periodic components (∼130, 90, 50, 22, 15, 4, 1.8 years), an annual cycle, and its first three harmonics. These periods are characteristic of the space-time evolution of the Earth’s rotation axis an

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Arfan, M., A. H. Makhdum, and G. Nabi. "ASSESSMENT OF TEMPORAL FLOW VARIABILITY OF THE KABUL RIVER." Journal of Mountain Area Research 2 (August 7, 2017): 1. http://dx.doi.org/10.53874/jmar.v2i0.21.

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Water resources estimation under changing flow regimes is required for planning and smooth distribution of water to provinces. Since the hydrological parameters are changing significantly due to climate change, the changes in the pattern of flow regimes are definite. The objective of present study was to assess the spatial and temporal hydro variability of Indus basin. The data of Kabul river at Nowshera before its confluence with Indus river were collected from Surface water Hydrology Project (SWHP), WAPDA. The seasons were divided as three and six month keeping in view the hydrological cycle

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Tursunova, Aisulu, Aliya Nurbatsina, Zhanat Salavatova, and Fredrik Huthoff. "Sustainability Challenges in Kazakhstan’s River Systems: Assessing Climate-Induced Hydrological Changes." Sustainability 17, no. 8 (2025): 3405. https://doi.org/10.3390/su17083405.

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Global and regional climate change and their water-related impacts are a key component in future development scenarios to guide sustainable water management. Climatic changes may lead to an undesirable redistribution of water supplies and potentially harmful extremities in river flows throughout the year. If we add to this the uneven spatial distribution of water resources in Kazakhstan, the importance of assessment of the intra-annual distribution of river flows under historical and present climatic conditions becomes evident. The presented scientific study analyzes decadal regional trends fr

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Nurbatsina, Aliya, Aisulu Tursunova, and Zhanat Salavatova. "INTRA-ANNUAL DISTRIBUTION OF RUNOFF OF TYPICAL RIVERS OF KAZAKHSTAN (ON THE EXAMPLE OF THE BUKTYRMA, ESIL, ZHAYIK RIVERS)." Hydrometeorology and Ecology 116, no. 1 (2025): 24–37. https://doi.org/10.54668/2789-6323-2025-116-1-24-37.

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Global climate change and intensive economic activity lead to redistribution of the rivers water regime. The study of patterns of intra-annual distribution of river runoff is one of the most important issues of rational and integrated use of water resources. The presented research analyses long-term regional trends in the intra-annual distribution of river runoff in the catchments of the Bukhtyrma - Lesnaya Pristan, Zhabay - Atbasar, and the Ulken Kobda - Kobda from 1985 to 2022. Scientific research was carried out on the basis of statistical analysis methods using multiyear values of average

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Imanov, Farda, Irada Aliyeva, Saleh Nagiyev, and Harald Leummens. "Changes in the annual flow of the Kura River." Czasopismo Geograficzne 94, no. 1 (2023): 39–52. http://dx.doi.org/10.12657/czageo-94-02.

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The article presents the analysis of changes in the annual flow of the Kura River and its large transboundary tributaries, resulting from climate change and anthropogenic factors, mainly irrigated agriculture. It is shown that a significant change in the flow regime of the Kura River began after the construction of the multi-purpose Mingachevir reservoir in 1953. Morevoer, climate change observed in the river basin since the mid 1990s manifests itself by an increase in air temperature and a decrease in precipitation, which has led to a further decrease in the river’s flow. During the lengthy d

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Mizukami, Naoki, Oldrich Rakovec, Andrew J. Newman, et al. "On the choice of calibration metrics for “high-flow” estimation using hydrologic models." Hydrology and Earth System Sciences 23, no. 6 (2019): 2601–14. http://dx.doi.org/10.5194/hess-23-2601-2019.

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Abstract. Calibration is an essential step for improving the accuracy of simulations generated using hydrologic models. A key modeling decision is selecting the performance metric to be optimized. It has been common to use squared error performance metrics, or normalized variants such as Nash–Sutcliffe efficiency (NSE), based on the idea that their squared-error nature will emphasize the estimates of high flows. However, we conclude that NSE-based model calibrations actually result in poor reproduction of high-flow events, such as the annual peak flows that are used for flood frequency estimat

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Piętka, Izabela. "Variability of Spring Riverflow of Selected Lowland Rivers." Miscellanea Geographica 14, no. 1 (2010): 177–83. http://dx.doi.org/10.2478/mgrsd-2010-0016.

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Abstract This paper aims at identification of changes in the spring discharge of six lowland rivers in Poland in 1966-2006. The contribution of the spring flow (February, March, April) in the annual flow was analysed as well as the 0.95 quantile time series of the daily flow. To investigate how the date of the occurrence of the spring riverflow changes, for each hydrological year the day up to which 50% of the annual flow had been reached was determined (CMD, the center of mass data). A test based on linear regression was applied, which determined the direction and rate of the changes. In five

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Benyahya, Loubna, Daniel Caissie, Fahim Ashkar, Nassir El-Jabi, and Mysore Satish. "Comparison of the annual minimum flow and the deficit below threshold approaches: case study for the province of New Brunswick, Canada." Canadian Journal of Civil Engineering 36, no. 9 (2009): 1421–34. http://dx.doi.org/10.1139/l09-077.

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A low-flow frequency analysis using the annual minimum flow (AMF) and the deficit below threshold (DBT) approaches was carried out for 30 hydrometric stations across the province of New Brunswick. The AMF method considers only the annual minimum events, and the DBT method considers all low flows below a certain threshold (or truncation level). In the present study, the DBT method characterizes low flow in terms of deficit intensity, which is becoming increasingly important in both water and aquatic resources management. The annual minimum series were fitted using the three-parameter Weibull di

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Szatten, Dawid, Edward Zbigniew Łaszyca, Alberto Bosino, Mattia De Amicis, and Oleksandr Obodovskyi. "Impact of Climate Conditions on the Sensitivity of Long-Term Annual River Flow in a Cascade-Dammed River System: The Brda River Case Study (Poland)." Geosciences 15, no. 6 (2025): 197. https://doi.org/10.3390/geosciences15060197.

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Maintaining the sustainable quantity and quality of water resources is crucial for fluvial systems, as well as for human life. This study describes the long-term annual river flow within the Brda River catchment of Poland, a fluvial system subjected to the strong hydrotechnical transformations of a cascade of dams. Our research was based on the following hydrological data (1951–2021), meteorological data (1971–2021), and climate scenarios (2022–50) to determine observed and simulated annual river flows. In this research, rising trends in the mean annual temperature and in the annual precipitat

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Strupczewski, Witold G., Krzysztof Kochanek, Iwona Markiewicz, Ewa Bogdanowicz, Stanislaw Weglarczyk, and Vijay P. Singh. "On the tails of distributions of annual peak flow." Hydrology Research 42, no. 2-3 (2011): 171–92. http://dx.doi.org/10.2166/nh.2011.062.

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This study discusses an application of heavy-tailed distributions to modelling of annual peak flows in general and of Polish data sets in particular. One- and two-shape parameter heavy-tailed distributions are obtained by transformations of random variables. The correct selection of a flood frequency model with emphasis on heavy-tailed distribution discrimination is then discussed. If a distribution is wrongly assumed, the error, in the upper quantile, arising as a result, depends on the method of parameter estimation and is shown analytically for three methods. Asymptotic and sampling values

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Hu, Kaiheng, Yong Li, and Fangqiang Wei. "Annual risk assessment on high-frequency debris-flow fans." Natural Hazards 49, no. 3 (2008): 469–77. http://dx.doi.org/10.1007/s11069-008-9290-y.

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Pumo, D., F. Viola, G. La Loggia, and L. V. Noto. "Annual flow duration curves assessment in ephemeral small basins." Journal of Hydrology 519 (November 2014): 258–70. http://dx.doi.org/10.1016/j.jhydrol.2014.07.024.

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Cockayne, B. J., D. Sternberg, D. W. Schmarr, A. W. Duguid, and R. Mathwin. "Lake Eyre golden perch (Macquaria sp.) spawning and recruitment is enhanced by flow events in the hydrologically variable rivers of Lake Eyre Basin, Australia." Marine and Freshwater Research 66, no. 9 (2015): 822. http://dx.doi.org/10.1071/mf14242.

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Understanding the links between fish recruitment and riverine flows is integral for setting priorities for river-management strategies, particularly in hydrologically variable and unpredictable arid and semi-arid zone rivers. In the present study, we used daily and annual otolith age estimates to identify relationships between riverine flow and spawning and recruitment of Lake Eyre golden perch (Macquaria sp.); an endemic fish of the Lake Eyre Basin, central Australia. We found a close association between Lake Eyre golden perch spawning and periods of increased river flow, with most of spawnin

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Zhang, Ling, Jianzhong Lu, Xiaoling Chen, et al. "Stream flow simulation and verification in ungauged zones by coupling hydrological and hydrodynamic models: a case study of the Poyang Lake ungauged zone." Hydrology and Earth System Sciences 21, no. 11 (2017): 5847–61. http://dx.doi.org/10.5194/hess-21-5847-2017.

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Abstract. To solve the problem of estimating and verifying stream flow without direct observation data, we estimated stream flow in ungauged zones by coupling a hydrological model with a hydrodynamic model, using the Poyang Lake basin as a test case. To simulate the stream flow of the ungauged zone, we built a soil and water assessment tool (SWAT) model for the entire catchment area covering the upstream gauged area and ungauged zone, and then calibrated the SWAT model using the data in the gauged area. To verify the results, we built two hydrodynamic scenarios (the original and adjusted scena

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Zhukov, I. A., and D. N. Aibulatov. "Trends of changes in water regime of small rivers in the Volga river basin during the period of instrumental observations." Lomonosov Geography Journal 79, no. 6, 2024 (2024): 81–90. https://doi.org/10.55959/msu0579-9414.5.79.6.7.

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Currently, the qualitative and quantitative hydrological characteristics and the dynamics of their changes are studied mainly for medium and large rivers. The hydrological characteristics of small rivers in Russia are poorly investigated. Considering the increasing deterioration of the ecological state of rivers, affecting primarily the intra-annual water flow distribution of small rivers, the study of flow formation processes, its variability and intra-annual changes is becoming the most important task of hydrology. The article examines changes in the indicators of the intra-annual distributi

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Wakeyo, Fekremariam N., Assefa M. Melesse, and Brook Abate. "Trends of Hydro-Meteorological Indices in Tendaho Catchment Part of Awash River Basin, Ethiopia." Environmental Sciences Proceedings 4, no. 1 (2020): 33. http://dx.doi.org/10.3390/ecas2020-08133.

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The variability in the intensity and frequency of extreme hydro-meteorological events due to climate change have an enormous impact on managing water resources in developing countries. Frequently it has been recognized as sudden droughts and severe floods. This study analyzed the spatial and temporal trends of five meteorology indices: annual maximum precipitation (AMP), annual precipitation (AP), mean areal precipitation (MAP), annual maximum temperature (AMaT) and annual minimum temperature (AMiT), and three streamflow indices: mean annual flow(MAF), annual maximum flow (AMaxF) and total mea

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Wakeyo, Fekremariam N., Assefa M. Melesse, and Brook Abate. "Trends of Hydro-Meteorological Indices in Tendaho Catchment Part of Awash River Basin, Ethiopia." Environmental Sciences Proceedings 4, no. 1 (2020): 33. http://dx.doi.org/10.3390/ecas2020-08127.

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The variability in the intensity and frequency of extreme hydro-meteorological events due to climate change have an enormous impact on managing water resources in developing countries. Frequently it has been recognized as sudden droughts and severe floods. This study analyzed the spatial and temporal trends of five meteorology indices: annual maximum precipitation (AMP), annual precipitation (AP), mean areal precipitation (MAP), annual maximum temperature (AMaT) and annual minimum temperature (AMiT), and three streamflow indices: mean annual flow(MAF), annual maximum flow (AMaxF) and total mea

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Pastor, A. V., F. Ludwig, H. Biemans, H. Hoff, and P. Kabat. "Accounting for environmental flow requirements in global water assessments." Hydrology and Earth System Sciences 18, no. 12 (2014): 5041–59. http://dx.doi.org/10.5194/hess-18-5041-2014.

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Abstract. As the water requirement for food production and other human needs grows, quantification of environmental flow requirements (EFRs) is necessary to assess the amount of water needed to sustain freshwater ecosystems. EFRs are the result of the quantification of water necessary to sustain the riverine ecosystem, which is calculated from the mean of an environmental flow (EF) method. In this study, five EF methods for calculating EFRs were compared with 11 case studies of locally assessed EFRs. We used three existing methods (Smakhtin, Tennant, and Tessmann) and two newly developed metho

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Venkataraman, Kartik, Narayanan Kannan, and Victoria Chraibi. "Low Flow Trends in Texas Stream Segments Serving Unique Hydrologic Functions." Texas Water Journal 14, no. 1 (2023): 3–33. http://dx.doi.org/10.21423/twj.v14i1.7143.

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In recognition of the unique hydrologic functions they serve, certain stream segments in Texas have been designated as ecologically significant. In this study, we evaluated low flow trends in seven hydrologically unique stream segments spanning three climatic divisions in Texas from 1970 to 2019. Despite increasing mean annual temperatures, there are no trends in low flows or other hydrologic variables in the East Fork of the San Jacinto River in the Upper Coast climatic division, likely due to local moisture surplus effects from the Gulf of Mexico. In the Edwards Plateau climatic division, an

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Eiyubov, I. A. "CHANGES IN THE MONTHLY AND SEASONAL FLOW OF RIVERS IN AZERBAIJAN (OGUZ-GABALA DISTRICTS)." Geography and water resources, no. 4 (December 28, 2023): 3–13. http://dx.doi.org/10.55764/2957-9856/2023-4-3-13.18.

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Azerbaijan (Oguz-Gabala region) was carried out. To assess current changes in water flow of rivers in the Oguz-Gabala region, statistical, water balance methods, as well as mathematical comparison methods were used. Average annual flows cover the period of observations of river flow from 1960 to 2017. The impact of modern changes on the regime of rivers in the Oguz-Gabala region has been assessed. The main goal of the work is to assess modern changes in river flow. River water flow for 1960-1990 (I period) was compared with water flow for 1991- 2017 (II period). Based on the results of compari

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Giles-Hansen, Krysta, Qiang Li, and Xiaohua Wei. "The Cumulative Effects of Forest Disturbance and Climate Variability on Streamflow in the Deadman River Watershed." Forests 10, no. 2 (2019): 196. http://dx.doi.org/10.3390/f10020196.

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Climatic variability and cumulative forest cover change are the two dominant factors affecting hydrological variability in forested watersheds. Separating the relative effects of each factor on streamflow is gaining increasing attention. This study adds to the body of literature by quantifying the relative contributions of those two drivers to the changes in annual mean flow, low flow, and high flow in a large forested snow dominated watershed, the Deadman River watershed (878 km2) in the Southern Interior of British Columbia, Canada. Over the study period of 1962 to 2012, the cumulative effec

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Pramono, I. B., T. M. Basuki, and D. Auliyani. "Effect of rainfall on assessment of hydrologic sustainability in Citanduy sub-watersheds." IOP Conference Series: Earth and Environmental Science 1201, no. 1 (2023): 012032. http://dx.doi.org/10.1088/1755-1315/1201/1/012032.

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Abstract Hydrology is one of the criteria for monitoring and evaluation (monev) of watersheds management as stated in the Minister of Forestry Regulation Number P.61/Menhut-II/2014. So far, the use of various hydrological parameters for the monev of watersheds has not been evaluated whether these parameters truly reflect the condition of the watershed. This study aimed (1) to evaluate the effect of rainfall on the hydrological criteria of each sub-watershed, which include: flow regime coefficient, annual flow coefficient, sediment load, and water use index and (2) to evaluate the effect of rai

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ISMAILOVA, I. G., G. KH ISMAIYLOV, L. D. RATKOVICH, N. V. MURASHCHENKOVA, and A. V. PERMINOV. "ANALYSIS AND FORECAST OF RIVER WATERS IN THE VOLGA RIVER RUNOFF FORMATION ZONE BY THE TRENDS METHOD." Prirodoobustrojstvo, no. 2 (2022): 69–78. http://dx.doi.org/10.26897/1997-6011-2022-2-69-78.

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The results of the study on the analysis, generalization and forecast of changes in the average annual and seasonal volumes (flows) of the Volga River to Volgograd (the formation zone) are presented. For the forecast, time flow series are used for the periods 1881/1882-2020/2021, N-140 years and 1914/1915/2020/2021, N-107 years. These periods are accepted as the basic periods characterizing the formation of the Volga River flow to Volgograd. It is revealed that the long-term fluctuations of the Volga River flow contain three periods, the first series, two periods, the second series, signifi ca

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Dong, Qianjin, Debin Fang, Jian Zuo, and Yongqiang Wang. "Hydrological alteration of the upper Yangtze River and its possible links with large-scale climate indices." Hydrology Research 50, no. 4 (2019): 1120–37. http://dx.doi.org/10.2166/nh.2019.112.

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Abstract The relationship between hydrological alteration and climate variability in the upper Yangtze River is not fully understood. In this paper, the periodicity features and the intercorrelation of annual and seasonal eco-flow metrics at the Yichang gauge station are analyzed for the period 1882 to 2013. Analysis is carried out to explore the formation of the eco-flow metrics and the possible linkages between eco-flow metrics and selected climate indices, using the cross-wavelet and wavelet coherence methods on data from 1948 to 2013. The results show that the variation of eco-flow metrics

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Alibaba, Halil. "Heat and Air Flow Behavior of Naturally Ventilated Offices in a Mediterranean Climate." Sustainability 10, no. 9 (2018): 3284. http://dx.doi.org/10.3390/su10093284.

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Air changes per hour (ach) rates for windows of different sizes and opened in different ratios were studied to establish natural ventilation concepts in offices with a Mediterranean climate. Dynamic thermal simulations were carried out in EDSL Tas for whole year investigations of an office. The office lost 0.01 W of heat during the winter but gained 0.01 W of heat during the summer. Annual average heat gain was 2.4 W. The heat gain via an external opaque wall was 138.9 W during the winter and 227.3 W during the summer, with an annual average of 190.7 W. The heat gain via an external glass surf

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SARMA, AALN, VVIZAYA BHASKAR, and CM SASTRY. "Potential Evapotranspiration over India - An estimate of Green Water flow." MAUSAM 65, no. 3 (2014): 365–78. http://dx.doi.org/10.54302/mausam.v65i3.1042.

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The spatial distribution of Potential Evapotranspiration (PET) is studied by selecting stations that are drawn from the Koppen Climate spectrum of India that spread the length and breadth of the country using the modified Penman potential evapotranspiration equation. Annual and seasonal PET trends are reported. Variation of mean seasonal PET for the country as whole for all the four meteorological seasons and its rate of change are graphically shown. Anomalies in the annual and seasonal PET for the epoch of 1961-1995 with reference to the base period 1931-1960 are brought out. Distribution of

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Xu, Shan, Liang Zhai, Bin Zou, and Huiyong Sang. "Multiscale Analysis of Water Area, Level and Flow and Their Relationships for a Large Lake Connected to Rivers: A Case Study of Dongting Lake, China." Water 16, no. 9 (2024): 1198. http://dx.doi.org/10.3390/w16091198.

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Exploring the different characteristics of water status at different time scales is essential for the understanding of the complex hydrological processes in lakes connected to rivers. Taking Dongting Lake, a large-scale lake connected to the Yangtze River, as an example, this study employed wavelet analysis and multiple models to explore the temporal characteristics of water area, level, and flow and the water level–area and flow–area correlations from 2000 to 2021 on annual, seasonal, and monthly scales. The results show that the interannual variations in annual, seasonal, and monthly water a

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Marahatta, Suresh, Laxmi Prasad Devkota, and Deepak Aryal. "Impact of Flow Variation on Hydropower Projects in Budhigandaki River Basin of Nepal." Journal of Institute of Science and Technology 26, no. 1 (2021): 89–98. http://dx.doi.org/10.3126/jist.v26i1.37831.

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Daily flow data from 1964 to 2015 of Budhigandaki River at Arughat were analyzed to assess the impact of flow variation at different time scales to the run of the river (RoR) type of hydropower projects. The data show very high inter-annual variation in daily, monthly and seasonal flows. The long term annual average flow at Arughat was 160 m3/s and varies from 120 to 210 m3/s. The long-term averages of loss in flow for both dry and wet seasons based on daily flows for three design discharges (Q90, Q60 and Q40) were found to be respectively -0.72, -1.76 and -1.54 m3/s for dry season and 0.0, -0

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Xiong, Bin, Lihua Xiong, Jie Chen, Chong-Yu Xu, and Lingqi Li. "Multiple causes of nonstationarity in the Weihe annual low-flow series." Hydrology and Earth System Sciences 22, no. 2 (2018): 1525–42. http://dx.doi.org/10.5194/hess-22-1525-2018.

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Abstract. Under the background of global climate change and local anthropogenic activities, multiple driving forces have introduced various nonstationary components into low-flow series. This has led to a high demand on low-flow frequency analysis that considers nonstationary conditions for modeling. In this study, through a nonstationary frequency analysis framework with the generalized linear model (GLM) to consider time-varying distribution parameters, the multiple explanatory variables were incorporated to explain the variation in low-flow distribution parameters. These variables are compr

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