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    Wyświetlanie 1-4 z 4
    Tytuł:
    The analysis of the El Niño phenomenon in the East Nusa Tenggara Province, Indonesia
    Autorzy:
    Karuniasa, Mahawan
    Pambudi, Priyaji Agung
    Powiązania:
    https://bibliotekanauki.pl/articles/2073753.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    climate
    communities
    drought
    El Nino
    freshwater
    rainfall
    Opis:
    Climate change causes various events, such as El Niño , and we experience their larger frequency. This study based on a quantitative approach uses observation data from the Umbu Mehang Kunda Meteorological Station and the Ocean Niño Index (ONI). As a result, East Sumba, which has an arid climate, has more challenges in dealing with drought and water deficits during El Niño. This study identifies rainfall when the El Niño phenomenon takes place in East Sumba through data contributing to the ONI value and dry day series from 1982 to 2019. The analysis was carried out by reviewing these data descriptively and supported by previous literature studies. The research found that there was a decrease in the accumulative total rainfall in El Niño years. The annual rainfall in the last six El Niño events is lower than the annual rainfall in the first six El Niño events. The dry day series is dominated by an extreme drought (>60 days) which generally occurs from July to October. This drought clearly has a major impact on livelihoods and causes difficulties in agriculture as well as access to freshwater. This results in crop failure, food shortages, and decreased income. The phenomenon triggers price inflation in the market and potential increase in poverty, hunger, and pushes the country further away from the first and second Sustainable Development Goals. This phenomenon and problems related to it need to be dealt with by multistakeholders.
    Źródło:
    Journal of Water and Land Development; 2022, 52; 180--185
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    El-Nino effect on reservoir capacity reliability: Case study of Sumi dam, Sumbawa Island, Indonesia
    Autorzy:
    Andawayanti, Ussy
    Yasa, I. Wayan
    Bisri, Mohammad
    Sholichin, Mochamad
    Sulianto, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/947275.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    capacity
    El-Nino
    evaporation
    reliability
    reservoir
    Opis:
    Reservoirs have a very important function in providing multi-sector water requirements. In the future, reservoirs not only serve to store and available water can also be used as disaster mitigation instruments. The completeness of hydrological measurements in reservoirs can be expanded more widely for climate change mitigation. The reliability of the reservoir capacity varies greatly depending on the El-Nino character that occurs among them El-Nino is weak, moderate, strong and very strong. The El-Nino characteristic is very influential on the period of water availability, the increase of evaporation capacity and decrease of reservoir capacity. Analysis of the reliability of the reservoir volume due to El-Nino using the Weibull equation. The deficit reservoir was calculated using the concept of water balance in the reservoir that is the relationship between inflow, outflow, and change of storage at the same time. Based on the results of the analysis showed that the evaporation increase and the decrease of reservoir capacity had a different pattern that is when the evaporation capacity started to increase at the same time the reservoir capacity decreased significantly. The correlation coefficient between evaporation capacity increase and decrease of reservoir water capacity are consecutively –0.828, –0.636, and –0.777 for El- Nino weak, moderate and very strong respectively. At the reservoir capacity reliability of 50% reservoir has a significant deficit. When weak El-Nino the deficit is 2.30∙106 m3, moderate: 6.58∙106 m3, and very strong 8.85∙106 m3.
    Źródło:
    Journal of Water and Land Development; 2020, 44; 1-7
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrological drought index based on reservoir capacity – Case study of Batujai dam in Lombok Island, West Nusa Tenggara, Indonesia
    Wskaźnik suszy hydrologicznej obliczany na podstawie pojemności zbiornika – przypadek zapory Batujai na wyspie Lombok, West Nusa Tenggara w Indonezji
    Autorzy:
    Yasa, I. W.
    Bisri, M.
    Sholichin, M.
    Andawayanti, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/293090.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    drought
    El-Nino
    hydrological drought index
    inflow
    outflow
    reservoir
    dopływ
    El-Niño
    odpływ
    susza
    wskaźnik suszy hydrologicznej
    zbiornik
    Opis:
    Hydrological drought index analysis has been widely developed and applied for the development of water resources. The island of Lombok, which is largely a dry land, requires a significant hydrological drought index to be sourced from measurable data analysis. This research focused aims to obtain hydrological drought index in Lombok Island using the capacity change of reservoir. The analysis includes reservoir data especially in the event of El-Nino. The main parameters analysed in this work are data homogeneity, decrease line of reservoir volume, increase in the line of reservoir volume, reservoir volume deficit, and hydrological drought index (RDI). The basic equation uses the water balance in the reservoir, which is the inflow–outflow and change of reservoir. The results of the analysis show that in the event of El-Nino, the drought hydrological index indicates different levels depending upon the water level of the reservoir. The criteria for the drought level are as follows: weak RDI = from −0.46 to −0.01 at an reservoir elevation of 90.88 to 92.33 m a.s.l, moderate RDI: from −0.59 to −0.46 at water level of reservoir from 90.27 to 90.88 m a.s.l, sever RDI: from −0.80 to −0.59 at water level of reservoir from 88.83 to 90.27 m a.s.l. and very severe RDI: from −0.89 to −0.80 at water level of water reservoir 87.78–88.83 m a.s.l. The duration of drought was 9 months, i.e., from February to November.
    Analiza wskaźnika suszy hydrologicznej ma szerokie zastosowanie w zarządzaniu zasobami wodnymi. Na ubogiej w wodę wyspie Lombok wskaźnik suszy powinien być określany na podstawie analizy mierzalnych danych. Przedstawione w niniejszej pracy badania miały na celu ustalenie wskaźnika dla wyspy z wykorzystaniem zmian pojemności zbiornika. Podstawą analiz były dane o zbiorniku, szczególnie podczas wystąpień El-Niño. Głównymi parametrami analizowanymi w tej pracy były: homogeniczność danych, linia spadku objętości zbiornika, linia wzrostu objętości zbiornika, deficyt objętości zbiornika i wskaźnik suszy hydrologicznej (RDI). Podstawowe równanie ujmuje bilans wody w zbiorniku, tzn. dopływ, odpływ i zmiany objętości. Wyniki analiz wskazują, że w trakcie trwania El-Niño wskaźnik suszy hydrologicznej przyjmował różne wartości w zależności od poziomu wody w zbiorniku. Kryteria natężenia suszy były następujące: słaba susza – RDI od –0,46 do –0,01, gdy poziom wody w zbiorniku wynosił od 90,88 do 92,33 m n.p.m., umiarkowana susza – RDI od –0,59 do –0,46, gdy poziom wody od 90,27 do 90,88 m n.p.m., silna susza – RDI od –0,80 do –0,59, gdy poziom wody od 88,83 do 90,27 m n.p.m. i bardzo silna susza – RDI od –0,89 do –0.80, gdy poziom wody od 87,78 do 88,83 m n.p.m. Susza w trakcie bardzo silnego El-Niño trwała 9 miesięcy od lutego do listopada.
    Źródło:
    Journal of Water and Land Development; 2018, 38; 155-162
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of annual high-discharge patterns in Kapuas River using information and complexity measures
    Autorzy:
    Gusti, Gillang N.N.
    Herawati, Henny
    Kawanisi, Kiyosi
    Al Sawaf, Mohamad B.
    Danial, Mochammad M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27312645.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    El Niño-Southern Oscillation
    flood pattern
    information measures
    complexity measures
    Kapuas River
    tropical monsoon
    Opis:
    A recent study revealed that the amount of rainfall on the Kapuas River has increased over the last 30 years. The increase in rainfall increases the possibility of high discharge events, which might lead to destructive flooding of the Kapuas River and its tributaries. Hence, the ability to characterise the pattern of high discharge events is compulsory for the development and management of the Kapuas River watershed. The main objective of this study was to assess and characterise flood patterns in the Kapuas River watershed. To achieve this objective, we utilised information and complexity measures that consisted of mean information gain (MIG), effective measure complexity (EMC) and fluctuation complexity (FC) in daily water level records from 2002 to 2011 from a gauging station in Sanggau, West Kalimantan Province. The results revealed that flood events in the Kapuas River were mainly generated by the Indo-Australian monsoon, which occurred from December to March. The anomaly in 2010, when intense flood events were observed during the dry season, can be identified as the effect of a strong negative El Niño-Southern Oscillation (ENSO). Additionally, the analysis of the information and complexity measures indicates that: (i) EMC, which reflects the length of flood events, tends to increase along with greater discharge, and (ii) MIG and FC, which denote the degree of randomness and fluctuation of flood events, respectively, tended to have higher values when the number of months without high discharge was less.
    Źródło:
    Journal of Water and Land Development; 2023, 57; 62--68
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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