scholarly journals Seasonality and multiannual variability of floods: case study from Eastern Poland

2018 ◽  
Vol 23 ◽  
pp. 00031
Author(s):  
Grzegorz Siwek
Keyword(s):  
Climate Change ◽  
Flow Duration Curve ◽  
Distribution Analysis ◽  
Climate Change Effects ◽  
Flow Duration ◽  
Flood Season ◽  
Seasonality Index ◽  
Annual Distribution ◽  
Flood Characteristics

Nowadays, under increasing climate change effects on the environment, we can observe increasing number of extreme phenomena, including meteorological and hydrological ones. One of such phenomena are floods. The objective of this article is the assessment of basic flood characteristics seasonality in the annual distribution. Analysis were performed based on time series of daily flow values recorded in the years 1951–2014 in three gauging stations located on rivers in Easter Poland, in upper Wieprz catchment. Floods were defined according to TLM algorithm and were assumed to be all cases of flow occurrence exceeding 10% read from FDC (flow duration curve) (Q10). Seasonality was analysed using Markham’s Seasonality Index and Period of Seasonal Concentration, analysis of autocorrelation function (ACF) as well as proposed by the author Seasonal Winter Floods Index. The distribution of floods during year indicates one flood season in year which occurs in the spring.

scholarly journals Hydro-Morphological Characteristics Using Flow Duration Curve, Historical Data and Remote Sensing: Effects of Land Use and Climate

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 309 ◽  
Author(s):  
Philip Kibet Langat ◽  
Lalit Kumar ◽  
Richard Koech ◽  
Manoj Kumer Ghosh
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Active Sites ◽  
Water Resource Management ◽  
Morphological Characteristics ◽  
Flow Duration Curve ◽  
Flow Duration ◽  
Tana River ◽  
Downstream Reach ◽  
History Of

Ecohydrological changes in large rivers of the world result from a long history of humandimensions and climate. The increasing human population, intensified land use, and climate change haveled to a decline in the most critical aspect of achieving sustainable development, namely, that of waterresources. This study assessed recent hydromorphological characteristics of the tropical Tana River inKenya using flow duration curve, and geospatial techniques to gain a better understanding of humanimpacts over the last two decades and their consequences for new development projects. The results showthat all extremal peak, low, and mean discharges exhibited significant increasing trends over a period of17 years. Dam construction represents a 13% reduction of the maximum discharge and a 30% decrease inlow flows, while post-regulation hydrological changes indicated an increase of 56 and 40% of high flowsand low flows respectively. Dominant flow was observed to be higher for the current decade than theprevious decade, representing a rise of the dominant streamflow by 33%. The assessment of fourmorphologically active sites at the downstream reach showed channel adjustments which support thechanges in the flow regimes observed. The channel width increased by 8.7 and 1.9% at two sites butdecreased by 31.5 and 16.2% for the other two sites under study during the time period. The resultsunderscore the contribution of other main human modifications, apart from regulation, such as increasedwater abstraction and inter basin transfer, up-stream land use and anthropogenic climate change to assessthe ecohydrological status in this river basin. Such streamflow regime dynamics may have implicationson water resource management, riverine environments, and development of new water projects.

scholarly journals Environmental Flows Assessment in Nepal: The Case of Kaligandaki River

2020 ◽  
Vol 12 (21) ◽  
pp. 8766 ◽  
Author(s):  
Naresh Suwal ◽  
Alban Kuriqi ◽  
Xianfeng Huang ◽  
João Delgado ◽  
Dariusz Młyński ◽  
...  
Keyword(s):  
Environmental Flows ◽  
Environmental Flow ◽  
Trophic Levels ◽  
Flow Duration Curve ◽  
Small Hydropower ◽  
Distribution Method ◽  
Flow Duration ◽  
Hydropower Plants ◽  
Study Results ◽  
Annual Distribution

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 allocating a specific percentage of mean annual flow or portion of flow derived from specific percentiles of the flow duration curve. However, e-flow releases should mimic the river’s intra-annual variability to meet the specific ecological function at different river trophic levels and in different periods over a year covering biotas life stages. The suitability of the methods was analyzed using the Indicators of Hydrological Alterations and e-flows components. The annual distribution method and the 30%Q-D (30% of daily discharge) methods showed a low alteration at the five global indexes for each group of Indicators of Hydrological Alterations and e-flows components, which allowed us to conclude that these methods are superior to the other methods. Hence, the study results concluded that 30%Q-D and annual distribution methods are more suitable for the e-flows implementation to meet the riverine ecosystem’s annual dynamic demand to maintain the river’s health. This case study can be used as a guideline to allocate e-flows in the Kaligandaki River, particularly for small hydropower plants.

Impacts of global climate change in a hydrologically vulnerable region: challenges to South African hydrologists

1997 ◽  
Vol 21 (1) ◽  
pp. 113-136 ◽  
Author(s):  
R.E. Schulze
Keyword(s):  
Climate Change ◽  
South Africa ◽  
South African ◽  
Southern Africa ◽  
Climate Changes ◽  
Global Climate ◽  
Sensitivity Study ◽  
Hydrological Models ◽  
Climate Change Effects

South Africa is already hydrologically vulnerable and this is likely to be exacerbated by both nonpermanent ENSO-related as well as more permanently greenhouse-gas forced climate changes. Climate change effects are explained by way of the hydrological equation. This serves as a backdrop to a brief review, in a hydrological context, of projected perturbations to temperature, rainfall and potential evaporation, over southern Africa. Methodologies for simulating hydro logical responses to climate change are assessed. These include more direct GCM-derived output, with some emphasis on recent advances in climatic downscaling, and the application of appro priate hydrological models for use in impact studies. Scale problems of importance to hydrologists are highlighted. Directions to which climate change-related hydrological research efforts should be expended in South Africa are summarized, before two case study simulations, one a general sensitivity study of hydrological responses to changes in rainfall over southern Africa, the other a more specific hydrological response study to the El Niño of the 1982-83 season, are presented. The article concludes with a discussion on whether or not water resources practitioners in South Africa should respond to climate change.

scholarly journals Climate change effects on the worst-case storm surge: a case study of Typhoon Haiyan

2015 ◽  
Vol 10 (6) ◽  
pp. 064011 ◽  
Author(s):  
Izuru Takayabu ◽  
Kenshi Hibino ◽  
Hidetaka Sasaki ◽  
Hideo Shiogama ◽  
Nobuhito Mori ◽  
...  
Keyword(s):  
Climate Change ◽  
Storm Surge ◽  
Worst Case ◽  
Climate Change Effects

scholarly journals Climate change effects on animal ecology: butterflies and moths as a case study

2021 ◽  
Author(s):  
Geena M. Hill ◽  
Akito Y. Kawahara ◽  
Jaret C. Daniels ◽  
Craig C. Bateman ◽  
Brett R. Scheffers
Keyword(s):  
Climate Change ◽  
Animal Ecology ◽  
Climate Change Effects

scholarly journals THE ECONOMIC EFFECTS OF APPLYING BENEFICIAL MICROORGANISMS IN VITICULTURAL PRODUCTION UNDER CLIMATE CHANGE CONDITIONS

2019 ◽  
Vol XXI (4) ◽  
pp. 299-307
Author(s):  
Mariusz Maciejczak
Keyword(s):  
Climate Change ◽  
Economic Effect ◽  
Economic Effects ◽  
Mitigation Strategies ◽  
Organic Fertilization ◽  
Climate Change Effects ◽  
Beneficial Microorganisms ◽  
Direct Benefits ◽  
Grape Varieties

The paper aimed to present the economic effects of applying beneficial microorganisms in viticultural production under climate change conditions. It was found that increasing climate change effects calls for a broad range of adaptation and mitigation strategies in agriculture, especially in viticultural production. One of them might be the innovative use of microorganisms that have the ability to interact with plants, and thus contribute to the prevention of stresses as well as respond to them, both abiotic – like drought and biotic – like pests. Based on the direct survey carried out in 2018 among experienced winegrowers from Germany, Italy and Poland, it was observed that there was a direct economic effect of the inoculation of beneficial microorganisms to the cultivation of resistant grape varieties. The majority of farmers think that such innovation in vineyards could reduce both the costs of protection and cultivation as well as increase direct benefits. Empirical evidence from the case study performed in 2018 in the Italian sustainable farm showed that such innovation, despite increasing the costs of irrigation and organic fertilization, also led to a significant reduction of artificial fertilizer and pesticide use, the costs of which predominated.

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