Trends and Variabilities in Rainfall and Streamflow: A Case Study of the Nilwala River Basin in Sri Lanka

Panditharathne, Ravindu; Gunathilake, Miyuru B.; Chathuranika, Imiya M.; Rathnayake, Upaka; Babel, Mukand S.; Jha, M. K.

doi:10.3390/hydrology10010008

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…Weather patterns have become more varied in the last half-century, with rainfall more frequent and intense [1,2]. The climate is a crucial factor influencing environmental systems, socioeconomic conditions, and the availability of water resources [3,4]. Due to varying weather patterns, the increase in hydrometeorological disasters, namely floods in the Asia Pacific region, especially in Indonesia, is very vulnerable.…”

Section: Introductionmentioning

confidence: 99%

Flood vulnerability analysis using the frequency ratio method with the watershed ecosystem in Bulukumba Regency, South Sulawesi Indonesia

Soma,

Arsyad,

Nursaputra

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Bulukumba Regency is located in the Province of South Sulawesi. It is one of the main tourist destinations and phinisi boat industry that provides much economic added value for the community and local government. Apart from these advantages, the problem of flooding is an obstacle and has a detrimental impact on the regional economy. Drainage problems, weather anomalies, and land function experts in the upstream area are factors in the occurrence of floods in Bulukumba Regency. This study used remote sensing and geographic information systems (GIS) combined with the Frequency Ratio (F.R.) method to create flood vulnerability maps. The parameters in this study are based on literature studies, data availability, and research site conditions such as rainfall, earth curvature, river distance, marbles, altitude, topographic wetness index (TWI), stream power index (SPI), soil texture, soil permeability, geology, and land use/land cover (LULC). The results of the identification of flood events obtained a total area of flood events, namely 6,345 ha, which was identified with the highest F.R. value in the closure of pond land and coastal sand beds, sand soil texture, and lithology, namely alluvium rocks. Validation was obtained for the success rate with a value of 0.895 and the prediction rate with a value of 0.887. It shows the weight that falls into the good category. The area of insecurity has a high of 7.20% and high of 1.69%.

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Section: Introductionmentioning

confidence: 99%

Flood vulnerability analysis using the frequency ratio method with the watershed ecosystem in Bulukumba Regency, South Sulawesi Indonesia

Soma,

Arsyad,

Nursaputra

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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show abstract

“…In recent years, scholars have continued to explore the new methods from multiple perspectives, including the tendency [4][5][6], mutability [7][8][9], wet and dry abundance [10][11][12], periodicity [13][14][15], and attribution analysis [16][17][18][19][20] for rainfall-runoff evolution. For example, Panditharathne et al [21] used the Mann-Kendall test to study the relationship among the variation trend of rainfall-runoff, the change points and runoff variation, and the rainfall-runoff in the Nirvara River Basin in southern Sri Lanka. Li et al [22] used multiple hydrological statistical methods such as the Mann-Kendall test, cumulative departure, and rainfall-runoff double mass curve to study the evolution characteristics of hydrological elements in the Dawen River Basin.…”

Section: Introductionmentioning

confidence: 99%

Evolution Characteristics of Rainfall and Runoff in the Upper Reaches of Zhang River Basin

Wang

Lei

2023

Water

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It is of great significance to study and analyze the surface water resources and their change trend in the groundwater overexploitation area of the North China Plain, which is of great significance to solve the shortage of water resources in the groundwater overexploitation area of the North China Plain, promote the exploitation of groundwater, and realize the sustainable development of water resources. This paper takes Minyou Irrigation District of Handan City, a typical overexploitation area in the North China Plain, as an example. Based on the measured rainfall and runoff data from 1957 to 2020, the Mann–Kendall trend test, cumulative anomaly method, double cumulative curve method, and Morlet wavelet transform were used to analyze and predict the trend of water resources in the irrigation area and the individual contribution of climate change and human activities to runoff change. The results show that the annual rainfall and annual runoff in the irrigation area have a significant downward trend and significant cyclical changes throughout the study period. In 1977, the annual runoff showed a sudden change, and the average contribution rates of climate change and human activities to its change were 40.55% and 59.46%, respectively. In the future (2020–2035), runoff will remain stable and rainfall will show an increasing trend. The research results can provide scientific reference for the development, utilization, and rational allocation of surface water resources in the groundwater overexploitation area of the North China Plain.

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“…Adu-Prah and Tetteh [16] have assessed relevant information on the role of temperature, rainfall, and humidity on malaria prevalence at different geographic scales for a better understanding of climate variability, and they examined the varying spatial and seasonal distributions in malaria prevalence over time in Ghana. There are similar studies that have investigated spatiotemporal climate variability and its impact on the hydrological cycle and quantity and quality of water resources [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Hydroclimatic Trends and Drought Risk Assessment in the Ceyhan River Basin: Insights from SPI and STI Indices

et al. 2023

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This study examined the spatiotemporal climate variability over the Ceyhan River basin in Southern Anatolia, Türkiye using historical rainfall and temperature observations recorded at 15 meteorology stations. Various statistical and geostatistical techniques were employed to determine the significance of trends for each climatic variable in the whole basin and its three sub-regions (northern, central, and southern regions). The results revealed that the recent years in the basin were generally warmer compared with previous years, with a temperature increase of approximately 4 °C. The standardized temperature index analysis indicated a shift towards hotter periods after 2005, while the coldest periods were observed in the early 1990s. The spatial distribution of temperature showed non-uniform patterns throughout the basin. The first decade of the study period (1975–1984) was characterized by relatively cold temperatures, followed by a transition period from cold to hot between 1985 and 2004, and a hotter period in the last decade (2005–2014). The rainfall analysis indicated a decreasing trend in annual rainfall, particularly in the northern and central regions of the basin. However, the southern region showed an increasing trend in annual rainfall during the study period. The spatial distribution of rainfall exhibited considerable variability across the basin, with different regions experiencing distinct patterns. The standardized precipitation index analysis revealed the occurrence of multiple drought events throughout the study period. The most severe and prolonged droughts were observed in the years 1992–1996 and 2007–2010. These drought events had significant impacts on water availability and agricultural productivity in the basin.

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Trends and Variabilities in Rainfall and Streamflow: A Case Study of the Nilwala River Basin in Sri Lanka

Cited by 11 publications

References 47 publications

Flood vulnerability analysis using the frequency ratio method with the watershed ecosystem in Bulukumba Regency, South Sulawesi Indonesia

Flood vulnerability analysis using the frequency ratio method with the watershed ecosystem in Bulukumba Regency, South Sulawesi Indonesia

Evolution Characteristics of Rainfall and Runoff in the Upper Reaches of Zhang River Basin

Hydroclimatic Trends and Drought Risk Assessment in the Ceyhan River Basin: Insights from SPI and STI Indices

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