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Journal articles on the topic 'Rain and rainfall Zambia Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Guideli, Leandro Canezin, André Lucas dos Reis Cuenca, Milena Arruda Silva, and Larissa de Brum Passini. "Road crashes and field rainfall data: mathematical modeling for the Brazilian mountainous highway BR-376/PR." TRANSPORTES 29, no. 4 (2021): 2498. http://dx.doi.org/10.14295/transportes.v29i4.2498.

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Recent studies analyze the influence of rainfall on traffic crashes, indicating that precipitation intensity is an important factor, for modeling crashes occurrence. This research presents a relationship between daily-basis traffic crashes and precipitation, from 2014 to 2018, in a rural mountainous Brazilian Highway (BR-376/PR), where field rain gauges were used to obtain precipitation data. Data modeling considered a Negative Binomial regression for precipitation influence in crash frequency. Separate regression models were estimated to account for the rainfall effect in different seasons, a

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Yussuff, Abayomi Isiaka Olanrewaju, Michael Olorunfemi Ayeni, and Oluwakemi Esther Oreoluwa. "Adoption of Deep Neural Network Model for the Prediction of Rain Attenuation." European Journal of Electrical Engineering and Computer Science 7, no. 1 (2023): 70–73. http://dx.doi.org/10.24018/ejece.2023.7.1.498.

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Weather, rain, and atmospheric forces cause attenuation in communication satellites and devices, which affects the quality of calls and internet access. Communication signals can seriously be affected by rainfall and various research has entailed developing adequate rainfall prediction models that can accurately predict rain attenuation. Predicting rainfall attenuation from measured data is a challenging process and several rainfall attenuation models exist, but their estimates are not close to actual measured rainfall attenuation data. This paper predicts rain attenuation using a Deep Neural

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Rauch, W., N. Thurner, and P. Harremoës. "Required accuracy of rainfall data for integrated urban drainage modeling." Water Science and Technology 37, no. 11 (1998): 81–89. http://dx.doi.org/10.2166/wst.1998.0441.

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It is standard practice in integrated urban water management to apply mathematical models of the total drainage system for calculating the frequency of occurrence of critical states in the receiving water body. The model input for such computations are long term time-series of rainfall data. However, it is inevitable that those rainfall data measurements deviate from reality. This is a result of inaccuracy of the measurement devices, errors in data transmission, local meteorological effects, etc. In this work we investigate the effect of such uncertainty in the rainfall data on the return peri

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Ramesh, Nadarajah I., Gayatri Rode, and Christian Onof. "A Cox Process with State-Dependent Exponential Pulses to Model Rainfall." Water Resources Management 36, no. 1 (2021): 297–313. http://dx.doi.org/10.1007/s11269-021-03028-6.

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AbstractA point process model based on a class of Cox processes is developed to analyse precipitation data at a point location. The model is constructed using state-dependent exponential pulses that are governed by an unobserved underlying Markov chain. The mathematical formulation of the model where both the arrival rate of the rain cells and the initial pulse depth are determined by the Markov chain is presented. Second-order properties of the rainfall depth process are derived and utilised in model assessment. A method of moment estimation is employed in model fitting. The proposed model is

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Yakovleva, Valentina, Aleksey Zelinskiy, Roman Parovik, Grigorii Yakovlev та Aleksey Kobzev. "Model for Reconstruction of γ-Background during Liquid Atmospheric Precipitation". Mathematics 9, № 14 (2021): 1636. http://dx.doi.org/10.3390/math9141636.

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With regard to reconstructing the gamma background dose rate, existing models are either empirical with limited applicability or have many unknown input parameters, which complicates their application in practice. Due to this, there is a need to search for a new approach and build a convenient, easily applicable and universal model. The paper proposes a mathematical model for reconstructing the temporal evolution of the ambient equivalent γ-radiation dose rate during rain episodes, depending on the density of radon flux from the soil surface, as well as the duration and intensity of rain. The

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Parsons, Scott A., and Robert A. Congdon. "Plant litter decomposition and nutrient cycling in north Queensland tropical rain-forest communities of differing successional status." Journal of Tropical Ecology 24, no. 3 (2008): 317–27. http://dx.doi.org/10.1017/s0266467408004963.

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Abstract:Soil processes are essential in enabling forest regeneration in disturbed landscapes. Little is known about whether litterfall from dominating pioneer species in secondary rain forest is functionally equivalent to that of mixed rain-forest litter in terms of contribution to soil processes. This study used the litterbag technique to quantify the decomposition and nutrient dynamics of leaf litter characteristic of three wet tropical forest communities in the Paluma Range National Park, Queensland, Australia over 511 d. These were: undisturbed primary rain forest (mixed rain-forest speci

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Silva, Thaís Rayane Gomes da, Igor Gledson de Oliveira Santos, Daniella Pereira dos Santos, et al. "Soil erodibility by simulated rainfall in Latosols." OBSERVATÓRIO DE LA ECONOMÍA LATINOAMERICANA 22, no. 5 (2024): e996. http://dx.doi.org/10.55905/oelv22n5-147.

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Determining a soil's resistance to disaggregation and particle transport is a complex factor that depends on the interaction of multiple attributes. Therefore, this study aimed to determine the indirect and direct erodibility of Latosols in the suborders Red, Yellow and Red-Yellow in the state of Alagoas. The soils were identified through the modal profile of the Agroecological Zoning of the State of Alagoas and through surveys of own classification of companies in the sugar and alcohol sector that have identification of areas of occurrence. They were submitted to chemical and physical analysi

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Sarkar, Sumit, Ayush Srivastava, and Er Avneet Kaur. "Prediction Rainfall with Regression Analysis." International Journal for Research in Applied Science and Engineering Technology 11, no. 3 (2023): 1934–43. http://dx.doi.org/10.22214/ijraset.2023.49852.

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Abstract: Weather forecasting is one of the many widely used applications of artificial intelligence. Forecasting precipitation is one of the most popular research topics because it results in a great deal of property damage and numerous fatalities. Large-scale flooding can have an impact on a variety of social and practical spheres, including agriculture and disaster preparedness. Even with the most advanced mathematical techniques, older, widely used precipitation prediction models were unable to achieve higher classification rates. This article introduces a cutting-edge new technique for fo

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Klamerus-Iwan, Anna, and Maciej Sporysz. "Laboratory determination of potential interception of young deciduous trees during low-intense precipitation." Folia Forestalia Polonica 56, no. 1 (2014): 3–8. http://dx.doi.org/10.2478/ffp-2014-0001.

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Abstract The research issue focuses on potential interception, which is the maximum amount of water that can be stored on plant surface. Tests under controlled conditions remain the best way to enhance knowledge on interception determinants in forest communities. Such tests can provide data for identification of mathematical models based on ecological criteria. The study presented in this paper concerned tree interception under simulated rain in a range from 2 to 11 mm/h. To perform the experiment a set of sprinklers was designed and built. The study included two deciduous species: beech (Fagu

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Klamerus-Iwan, Anna, and Maciej Sporysz. "Laboratory determination of potential interception of young deciduous trees during low-intense precipitation." Folia Forestalia, Series A - Forestry 56(1) (March 1, 2014): 3–8. https://doi.org/10.2478/ffp-2014-0001.

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The research issue focuses on potential interception, which is the maximum amount of water that can be stored on plant surface. Tests under controlled conditions remain the best way to enhance knowledge on interception determinants in forest communities. Such tests can provide data for identification of mathematical models based on ecological criteria. The study presented in this paper concerned tree interception under simulated rain in a range from 2 to 11 mm/h. To perform the experiment a set of sprinklers was designed and built. The study included two deciduous species: beech (Fagus sylvati

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Chisanga, Charles Bwalya, Elijah Phiri, and Vernon R. N. Chinene. "Reliability of Rain-Fed Maize Yield Simulation Using LARS-WG Derived CMIP5 Climate Data at Mount Makulu, Zambia." Journal of Agricultural Science 12, no. 11 (2020): 275. http://dx.doi.org/10.5539/jas.v12n11p275.

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The impact of climate change on crop growth and yield can be predicted using crop simulation models. A study was conducted to assess the reliability and uncertainty of simulated maize yield for the near future in 2050s at Mount Makulu (latitude = 15.550o S, longitude = 28.250o E, altitude = 1213 m), Zambia. The Long Ashton Research Station Weather Generator (LARS-WG) was used to generate baseline (1980-2010) and future (2040-2069) climate scenarios for two Representative Concentration Pathways (RCP 4.5 and RCP 8.5). Results showed that mean temperature would increase by 2.09oC (RCP 4.5) and 2.

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Benestad, Rasmus E., Kajsa M. Parding, and Andreas Dobler. "Downscaling the probability of heavy rainfall over the Nordic countries." Hydrology and Earth System Sciences 29, no. 1 (2025): 45–65. https://doi.org/10.5194/hess-29-45-2025.

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Abstract. We used empirical–statistical downscaling to derive local statistics for 24 h and sub-daily precipitation over the Nordic countries, based on large-scale information provided by global climate models. The local statistics included probabilities for heavy precipitation and intensity–duration–frequency (IDF) curves for sub-daily rainfall. The downscaling was based on estimating key parameters defining the shape of mathematical curves describing probabilities and return values, namely the annual wet-day frequency, fw, and the wet-day mean precipitation, μ. Both parameters were used as p

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Ávila-Dávila, Laura, Manuel Soler-Méndez, Carlos Francisco Bautista-Capetillo, et al. "A Compact Weighing Lysimeter to Estimate the Water Infiltration Rate in Agricultural Soils." Agronomy 11, no. 1 (2021): 180. http://dx.doi.org/10.3390/agronomy11010180.

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Infiltration estimation is made by tests such as concentric cylinders, which are prone to errors, such as the lateral movement under the ring. Several possibilities have been developed over the last decades to compensate these errors, which are based on physical, electronic, and mathematical principles. In this research, two approaches are proposed to measure the water infiltration rate in a silty loam soil by means of the mass values of a lysimeter weighing under rainfall conditions and different moisture contents. Based on the fact that with the lysimeter it is possible to determine acting s

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van Dijk, J., and E. R. Morgan. "The influence of water and humidity on the hatching of Nematodirus battus eggs." Journal of Helminthology 86, no. 3 (2011): 287–92. http://dx.doi.org/10.1017/s0022149x1100040x.

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AbstractThis paper examines the influence of water on the ecology of the eggs of Nematodirus battus, with a view to estimating the importance of including rainfall in mathematical models of parasite abundance. The literature suggests that, under pasture conditions, the availability of moisture is unlikely to be limiting for egg development, while eggs and infective larvae are highly resistant to desiccation. In the presented experiment, eggs that had been kept in salt sludges at 95% and 70% RH and were subsequently put at 15°C produced only a mildly accelerated, but not a mass, hatch, in the f

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Head, P. C., D. H. Crawshaw, P. Dempsey, and C. J. Hutchings. "Bathing in the Rain - The Use of Mathematical Models for Storm Water Management to Achieve Bathing Water Quality (The Fylde Coast-NW England)." Water Science and Technology 25, no. 12 (1992): 59–68. http://dx.doi.org/10.2166/wst.1992.0337.

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One of the major problems in trying to design wastewater treatment schemes to protect bathing water for coastal communities with combined sewerage systems, is to ensure that discharges of storm water do not prejudice compliance with the requirements of the EC Bathing Water Directive. In order to develop an appropriate storm water management strategy for the Fylde coast it was necessary to integrate a number of mathematical models simulating the hydraulic behaviour of the sewerage system and the dispersion of discharges in the receiving waters. From the sewerage system modelling it was apparent

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Mendes, T. A., S. F. Sousa Júnior, and S. A. S. Pereira. "Implementation of the Green-Ampt Infiltration Model: Comparative between different numerical solutions." Trends in Computational and Applied Mathematics 22, no. 4 (2021): 645–58. http://dx.doi.org/10.5540/tcam.2021.022.04.00645.

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The phenomena of infiltration and the percolation of water in the soil are of fundamental importance for the evaluation of runoff, groundwater recharge, evapotranspiration, soil erosion and transport of chemical substances in surface and groundwater. Within this context, the quantitative determination of the infiltration values is extremely important for the different areas of knowledge, in order to evaluate, mainly the surface runoff. Several types of changes in vegetation cover and topography result in significant changes in the infiltration process, making it necessary to use mathematical m

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17

Cardoso, Dione Pereira, Fábio Ribeiro Pires, and Robson Bonomo. "Avaliação de modelos matemáticos para estimativa da erosividade da chuva na região de São Mateus-ES." Revista Verde de Agroecologia e Desenvolvimento Sustentável 11, no. 3 (2016): 98. http://dx.doi.org/10.18378/rvads.v11i3.4132.

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<p>Objetivou-se estimar a erosividade da chuva, mediante seis modelos matemáticos, de regressão linear avaliando entre estes, qual é mais indicado para as condições climáticas da região de São Mateus-ES. Os dados pluviométricos foram obtidos junto à Agência Nacional das Águas-ANA, sendo de 1947 a 2014 para Itauninhas, de 1971 a 2014 para Barra Nova, de 1981 a 2014 para São João da Cachoeira Grande e de 1993 a 2014 para Boca da Vala. Para estimar a erosividade da chuva, a partir da precipitação anual e do coeficiente de chuva, foram utilizadas diferentes equações utilizadas em outros esta

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18

Pasculli, Antonio, Jacopo Cinosi, Laura Turconi, and Nicola Sciarra. "Learning Case Study of a Shallow-Water Model to Assess an Early-Warning System for Fast Alpine Muddy-Debris-Flow." Water 13, no. 6 (2021): 750. http://dx.doi.org/10.3390/w13060750.

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The current climate change could lead to an intensification of extreme weather events, such as sudden floods and fast flowing debris flows. Accordingly, the availability of an early-warning device system, based on hydrological data and on both accurate and very fast running mathematical-numerical models, would be not only desirable, but also necessary in areas of particular hazard. To this purpose, the 2D Riemann–Godunov shallow-water approach, solved in parallel on a Graphical-Processing-Unit (GPU) (able to drastically reduce calculation time) and implemented with the RiverFlow2D code (versio

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19

Silva, Reginaldo Barboza da, Piori Iori, and Francisca Alcivania de Melo Silva. "PROPOSIÇÃO E VALIDAÇÕES DE EQUAÇÕES PARA ESTIMATIVA DA EROSIVIDADE DE DOIS MUNICÍPIOS DO ESTADO DE SÃO PAULO." IRRIGA 14, no. 4 (2018): 533–47. http://dx.doi.org/10.15809/irriga.2009v14n4p533-547.

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PROPOSIÇÃO E VALIDAÇÕES DE EQUAÇÕES PARA ESTIMATIVA DA EROSIVIDADE DE DOIS MUNICÍPIOS DO ESTADO DE SÃO PAULO Reginaldo Barboza da Silva1; Piero Iori2; Francisca Alcivania de Melo Silva11 Universidade Estadual Paulista, Unidade de Registro, Registro, rbsilva@registro.unesp.br2 Departamento de Ciência do Solo, Universidade Federal de Lavras, Lavras, MG 1 RESUMO O uso e extrapolação de equações para localidades cujas características de solo e clima, ainda que parciais, distingam da localidade para a qual tenham sido geradas, ainda permeiam em estudos para estimativa da erosividade (EI30). Este tr

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Delrieu, Guy, Anil Kumar Khanal, Frédéric Cazenave, and Brice Boudevillain. "Sensitivity analysis of attenuation in convective rainfall at X-band frequency using the mountain reference technique." Atmospheric Measurement Techniques 15, no. 11 (2022): 3297–314. http://dx.doi.org/10.5194/amt-15-3297-2022.

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Abstract. The RadAlp experiment aims at improving quantitative precipitation estimation (QPE) in the Alps thanks to X-band polarimetric radars and in situ measurements deployed in the region of Grenoble, France. In this article, we revisit the physics of propagation and attenuation of microwaves in rain. We first derive four attenuation–reflectivity (AZ) algorithms constrained, or not, by path-integrated attenuations (PIAs) estimated from the decrease in the return of selected mountain targets when it rains compared to their dry weather levels (the so-called mountain reference technique – MRT)

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Fernandes, Amanda Cristiane Gonçalves, Hugo Morais De Alcântara, Camilo Allyson Simões De Farias, and Sileno Fernandes Oliveira Filho. "Use of Statistical Tools and Artificial Intelligence for Hydrosedimentological Analysis in Experimental Units in Semiarid Brazil." Revista de Gestão Social e Ambiental 18, no. 3 (2024): e04762. http://dx.doi.org/10.24857/rgsa.v18n3-052.

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Objective: To compare statistical and artificial intelligence tools to assist in the analysis and influence of hydrosedimentological variables on runoff generation and sediment yield in experimental units in the Brazilian semiarid region.  Theoretical framework: The increasing frequency of extreme weather events in areas prone to natural disasters has led to economic, social, and loss of life due to the lack of urban planning, disorderly occupation in densely populated areas, intensive use of natural resources, and difficulty in maintaining and conserving natural ecosystems (CARMO

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Turco, M., and M. Milelli. "The forecaster's added value in QPF." Advances in Geosciences 25 (March 9, 2010): 29–36. http://dx.doi.org/10.5194/adgeo-25-29-2010.

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Abstract. To the authors' knowledge there are relatively few studies that try to answer this question: "Are humans able to add value to computer-generated forecasts and warnings?". Moreover, the answers are not always positive. In particular some postprocessing method is competitive or superior to human forecast. Within the alert system of ARPA Piemonte it is possible to study in an objective manner if the human forecaster is able to add value with respect to computer-generated forecasts. Every day the meteorology group of the Centro Funzionale of Regione Piemonte produces the HQPF (Human Quan

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L, Shirani-Bidabadi. "A Comprehensive Survey of Population Ecology in Insects." Journal of Energy and Environmental Science 2, no. 1 (2024): 1–7. http://dx.doi.org/10.23880/jeesc-16000117.

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Population ecology focuses on studying populations and their relationship with the environment, including parameters such as birth, death, migration, density, and age distribution. Population ecology involves laboratory work, field observations, and the use of mathematical and statistical models to study groups of organisms. By studying populations, researchers gain insights into population dynamics, growth, distribution, density, and age structure. Insects play a vital role in population ecology by influencing ecosystems and human societies. They contribute to ecological processes such as dec

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Ветров, А. Л., and А. А. Тиунов. "FLOOD SIMULATION IN THE KAMA RIVER BASIN 2005." Гидросфера. Опасные процессы и явления 3, no. 3 (2022): 250–58. http://dx.doi.org/10.34753/hs.2021.3.3.250.

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Глобальное потепление климата увеличивает общее влагосодержание атмосферы, что создает благоприятные условия для формирования интенсивных обложных осадков и ливней. Современные системы предупреждения о паводках все еще недостаточно эффективны, особенно в местах с редкой сетью метеорологических наблюдений. Математические модели атмосферы, построенные на полных уравнениях гидродинамики, позволяют с достаточной заблаговременностью рассчитать интенсивность осадков с высокой детализацией. В данной работе изучен вопрос объединения региональной негидростатической модели атмосферы Weather Research and

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Arfib, Bruno, Ghislain de Marsily, and Jacques Ganoulis. "Coastal karst springs in the Mediterranean basin : study of the mechanisms of saline pollution at the Almyros spring (Crete), observations and modelling." Bulletin de la Société Géologique de France 173, no. 3 (2002): 245–53. http://dx.doi.org/10.2113/173.3.245.

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Abstract Variations in salinity and flow rate in the aerial, naturally salty spring of Almyros of Heraklion on Crete were monitored during two hydrological cycles. We describe the functioning of the coastal karstic system of the Almyros and show the influence of the duality of the flow in the karst (conduits and fractured matrix) on the quality of the water resource in the coastal area. A mechanism of saltwater intrusion into this highly heterogeneous system is proposed and validated with a hydraulic mathematical model, which describes the observations remarkably well. Introduction. – Fresh gr

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Yanting, Huang, and Guo Yonggang. "Risk assessment of rain-induced debris flow in the lower reaches of Yajiang River based on GIS and CF coupling models." Open Geosciences 15, no. 1 (2023). http://dx.doi.org/10.1515/geo-2022-0472.

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Abstract In order to reduce the adverse impact of debris flow disasters on engineering construction facilities and social security in the lower reaches of the Yajiang River, this article selected 11 risk assessment factors such as elevation, aspect, profile curvature, Relief, and rainfall to study the occurrence rule of debris flow in this area. The data of disaster factors caused by debris flow points were derived and analyzed in ArcGIS. Then, factor correlation test and factor sensitivity level were established. The coupling model of qualitative mathematical model (analytic Hierarchy Process

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Al-Humairi, Basima Abbas Jabir, and Nadhum Shamkhi Rahal. "Variability of time duration analysis for rainfall water using precipitation indexes in Hai town." Water Practice & Technology, February 8, 2024. http://dx.doi.org/10.2166/wpt.2024.023.

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Abstract Insufficient rainfall has an impact on a variety of natural resources. This work aims to determine the variability of rainfall and drought in Hai town depending on the standardized rainfall index (SRI), rainfall concentration index (RCI), index of wetness (IW), and coefficient of variation (CV). Rainfall series were taken from the Meteorological Station Directorate of Hai Town, Iraq for a period of 30 years (1989–2018). The results indicated that the years 1996 and 2014 had high SRI and were under extremely wet conditions (IW = 195.93 and 165.93, respectively). However, the lowest SRI

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Galamić, Anadel, Zahid Bašić, and Nedim Suljić. "CORRELATION AND REGRESSION RELATIONSHIPS OF PARAMETERS OF RAINWATER DRAINAGE FROM ROADS." Archives for Technical Sciences 1, no. 27 (2022). http://dx.doi.org/10.7251/afts.2022.1427.019g.

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In order to find the optimal solution for the drainage of rainwater from roads in urban areas, as well as for the evaluation and ranking of conceptual solutions, appropriate mathematical models and software packages were used in this research. For relevant rain episodes, i.e. rainfall of appropriate duration and intensity, runoff coefficients and flows were taken into account and analyzed according to the rational method, all for the purpose of obtaining data on the amount of rainwater entering the sewage system. Through this research, very good correlations and regressions were established be

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Silva, Maria E. S. da, Samuel Beskow, Aryane A. Rodrigues, and Tamara L. C. Beskow. "APPLICABILITY OF HEC-DSSVue FOR MANAGEMENT OF HYDROLOGICAL GAGING NETWORK: A CASE STUDY USING SUB-HOURLY RAINFALL DATASETS FROM SOUTHERN BRAZIL." Engenharia Agrícola 45 (2025). https://doi.org/10.1590/1809-4430-eng.agric.v45e20240143/2025.

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ABSTRACT Hydrological data are typically sequential and often correspond to large datasets, and not all application programs allow their retrieval, storage, and manipulation. This technical article aims to contribute to this subject by reporting the applicability of the Data Storage System of the Hydrologic Engineering Center (HEC-DSSVue) using 5-min rainfall datasets collected from 10 self-recording rain gages (2014–2023) installed in Southern Brazil. Although the HEC-DSSVue is commonly used to integrate databases into other HEC models (HEC-HMS and HEC-RAS), its application in managing hydrol

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Haruna, Abubakar, Juliette Blanchet, and Anne‐Catherine Favre. "Estimation of Intensity‐Duration‐Area‐Frequency Relationships Based on the Full Range of Non‐Zero Precipitation From Radar‐Reanalysis Data." Water Resources Research 60, no. 2 (2024). http://dx.doi.org/10.1029/2023wr035902.

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AbstractIntensity‐Duration‐Area‐Frequency (IDAF) models provide the mathematical link between precipitation intensities (I), durations (D), areas (A), and frequency of occurrence (F). They play a critical role in hydrological design, areal rainfall hazard quantification, storm characterization, and early warning system development. IDAF models extend the conventional Intensity‐Duration‐Frequency models by accounting for the spatial extent of precipitation (i.e., the area). In this study, we develop IDAF models using the entire non‐zero precipitation intensities, not only the extremes. We use t

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Pasculli, Antonio, Jacopo Cinosi, Laura Turconi, and Nicola Sciarra. "Learning Case Study of a Shallow-Water Model to Assess an Early-Warning System for Fast Alpine Muddy-Debris-Flow." March 11, 2021. https://doi.org/10.3390/w13060750.

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The current climate change could lead to an intensification of extreme weather events, such as sudden floods and fast flowing debris flows. Accordingly, the availability of an early-warning device system, based on hydrological data and on both accurate and very fast running mathematical-numerical models, would be not only desirable, but also necessary in areas of particular hazard. To this purpose, the 2D Riemann–Godunov shallow-water approach, solved in parallel on a Graphical-Processing-Unit (GPU) (able to drastically reduce calculation time) and implemented with the RiverFlow2D code (versio

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