Vidaus vandens kelio E-41 skaičiuotini vandens lygiai ir jų kaita

Tiriamojo darbo objektas: Nemuno upės Kaunas- Kuršių Marios atkarpa, priklausanti Vidaus vandens keliui E-41 vandens lygių kaitos tendencijos. Tiriamojo darbo tikslas: atlikti Nemuno upės baseino vandens lygių duomenų analizę, apskaičiuoti pagrindines hidrologines charakteristikas taikomas vidaus vandens keliams, išnagrinėti duomenų tarpusavio ryšį, vandens lygių kaitos cikliškumą ir periodiškumą bei įvertinti vandens lygių kaitos tendencijas. Tiriamojo darbo uždaviniai:

1. surinkti Nemuno upės vandens lygių matavimo duomenis iš Rusnės, Panemunės, Smalininkų ir Lampėdžių vandens matavimo stočių;
2. palyginti vandens lygių analizės metodus.
3. išanalizuoti Nemuno upės baseino surinktus vandens lygių matavimo duomenis ir įvertinti jų patikimumą. Tiriamojo darbo metodika: Nemuno upės ties Rusne, Panemune, Smalininkais ir Lampėdžiais vandens lygių stebėjimų duomenys išrinkti iš hidrologijos metraščių nuo 1950 iki 2020 metų. Informacijos šaltinių analizės skyrius rašomas remiantis kitų mokslininkų atliktais tyrimais bei naudojamais metodais. Išsamiai išanalizuojama vidaus vandens kelio parametrai, apskaičiuojama vandens kelio projektiniai vandens lygiai, optimalūs vandens kelio lygiai po tiltais. Gauti rezultatai sutvarkomi, įvertinami ir daromos išvados. Tiriamojo darbo rezultatai: Vidaus vandenų transporto naudojimas gali padėti pasiekti strateginį tikslą – sukurti aplinkai ir visuomenei draugišką susisiekimo sistemą (vvkd.lt). Darbe analizuojamos ilgalaikės vandens lygių duomenų eilės, apskaičiuojant vidaus vandens kelio E-41 projektinius lygius. Kintantys vandens lygiai yra klimato kaitos formavimosi netiesioginis indikatorius, kuris gali daryti reikšmingą poveikį projektiniams vandens lygiams. Analizei atlikti vadovautasi „Mėlynojoje knygoje“ aprašyta vandens lygių nustatymo metodika. Išanalizuotos VL ilgalaikės duomenų eilės, naudojant neparametrinius testus, o rezultatai įvertinti klimato kaitos atžvilgiu. Testų analizė parodė, kad 70 m. VL duomenys yra ryškiai paveikti vagos degradacijos bei klimato kaitos ir netenkina (WMO) nustatytų testų, bei turi labai ryškią mažėjimo tendenciją, todėl visos eilės negalima naudoti hidrologiniuose skaičiavimuose. Todėl naudota sutrumpinta duomenų eilė, kuri tenkina nepriklausomumo, stacionarumo ir homogeniškumo testus. Tyrimo metu nustatyta, kad vandens kelio maksimalių VL kaita klimato kaitos fone leidžia daryti išvadą, kad jie nedidės. Tuo tarpu minimalūs VL gali didėti. Scope of work: master's thesis 49 pages, 11 paintings, 10 tables, * literary source. Key words: calculated (design) water levels, inland waterway, Nemunas River. Subject of the research work: Nemunas River Kaunas - Part of the Curonian Lagoon, which belongs to the Inland Waterway E-41 water level change trends. The aim of the research work is to carry out an analysis of hydrological data of the Nemunas River basin, to calculate the main hydrological characteristics applied to inland waterways, to examine the interrelationship between the data, the cyclicality and periodicity of the change in water levels, and to assess the trends of water level change. The tasks of the research work are: collect water levels measurement data of the Nemunas River from Rusnė, Panemunė, Smalininkai and Lampėdžiai water measuring stations; discuss methods of analyzing water levels. analyse the water level measurement data collected by the Nemunas River basin and assess their reliability. Methodology of the research work: the data of water level observations of the River Nemunas near Rusnė, Panemunė, Smalininkai and Lampėdžiai were collected from the hydrology annals from 1950 to 2020. The literature review section is written by analyzing the research carried out by other scientists and the methods used. The parameters of the inland waterway are analyzed in detail, the design water levels of the waterway are calculated, the optimal levels of the waterway under the bridges are calculated. The results obtained are arranged, evaluated and conclusions are drawn. Results of the research work: The use of inland waterway transport can contribute to the strategic objective of establishing an environmentally and socially friendly transport system. The article analyzes long-term data series of water levels by calculating the design levels of the inland waterway E-41. Changing water levels are an indirect indicator of the formation of climate change, which can have a significant impact on the design water levels. The methodology for determining water levels described in the Blue Paper was used for the analysis. Long - term data series of water levels were analysed using non - parametric tests and the results were assessed in relation to climate change. Test analysis has shown that data on 70 – year - old water levels are significantly affected by the degradation of the riverbed and climate change and do not meet the tests set by the WMO, and have a very marked downward trend, so that the entire series cannot be used in hydrological calculations. Therefore, a shortened data series was used to meet the independence, stationary and homogeneity tests. The study found that the change in the maximum water levels of the waterway against the background of climate change leads to the conclusion that they will not increase. Meanwhile, minimum water levels may increase.

Subject of the research work: Nemunas River Kaunas - Part of the Curonian Lagoon, which belongs to the Inland Waterway E-41 water level change trends. The aim of the research work is to carry out an analysis of hydrological data of the Nemunas River basin, to calculate the main hydrological characteristics applied to inland waterways, to examine the interrelationship between the data, the cyclicality and periodicity of the change in water levels, and to assess the trends of water level change. The tasks of the research work are: collect water levels measurement data of the Nemunas River from Rusnė, Panemunė, Smalininkai and Lampėdžiai water measuring stations; discuss methods of analyzing water levels. analyse the water level measurement data collected by the Nemunas River basin and assess their reliability. Methodology of the research work: the data of water level observations of the River Nemunas near Rusnė, Panemunė, Smalininkai and Lampėdžiai were collected from the hydrology annals from 1950 to 2020. The literature review section is written by analyzing the research carried out by other scientists and the methods used. The parameters of the inland waterway are analyzed in detail, the design water levels of the waterway are calculated, the optimal levels of the waterway under the bridges are calculated. The results obtained are arranged, evaluated and conclusions are drawn. Results of the research work: The use of inland waterway transport can contribute to the strategic objective of establishing an environmentally and socially friendly transport system. The article analyzes long-term data series of water levels by calculating the design levels of the inland waterway E-41. Changing water levels are an indirect indicator of the formation of climate change, which can have a significant impact on the design water levels. The methodology for determining water levels described in the Blue Paper was used for the analysis. Long - term data series of water levels were analysed using non - parametric tests and the results were assessed in relation to climate change. Test analysis has shown that data on 70 – year - old water levels are significantly affected by the degradation of the riverbed and climate change and do not meet the tests set by the WMO, and have a very marked downward trend, so that the entire series cannot be used in hydrological calculations. Therefore, a shortened data series was used to meet the independence, stationary and homogeneity tests. The study found that the change in the maximum water levels of the waterway against the background of climate change leads to the conclusion that they will not increase. Meanwhile, minimum water levels may increase.