Search results for "fall"

Practical thresholds to distinguish erosive and rill rainfall events

2019

Abstract In this paper, 1017 rainfall events from 2008 to 2017 are used to identify the rainfall threshold that produces upland erosion at the Masse (central Italy) and Sparacia (southern Italy) experimental stations. The rainfall events are classified into three classes: non-erosive, interrill-only and rill. The threshold values for separating as correctly as possible the erosive rains (case I) and the rill rains (case II) are derived solely from the hyetograph. Each threshold value is obtained by imposing that the long-term erosivity of the events above the threshold is equal to the long-term erosivity of all erosive events (case I) or only rill events (case II). The performances of selec…

Agile methodology for implementation of curriculum

2022

Ledaka P. “Agile metode mācību priekšmeta - dizains un tehnoloģijas īstenošanai”: Otrā līmeņa profesionālās augstākās izglītības programma “Skolotājs” Rīga: LU, 2021 Darba apjoms: 33 lpp., 7 attēli, 29 bibliogrāfiskie avoti, 4 pielikumi. Otrā līmeņa profesionālās augstākās izglītības programmā “Skolotājs” izstrādāts diplomdarbs “Agile metode mācību priekšmeta - dizains un tehnoloģijas īstenošanai”. Diplomdarba tēma balstīta uz tehnoloģiju attīstību skolas vidē, kas savu aktualitāti jo īpaši ieguva Covid-19 pandēmijas laikā, attālinātu mācību procesā. Izmantojot IT projekta vadības principus - Agile, piekopjot Scrum metodi, iespējams ērti un efektīgi apgūt lielu informācijas daudzumu mācību …

An Evaluation Matrix to Compare Computer Hydrological Models for Flood Predictions

2020

In order to predict and control the impacts of floods in torrents, it is important to verify the simulation accuracy of the most used hydrological models. The performance verification is particularly needed for applications in watersheds with peculiar climatic and geomorphological characteristics, such as the Mediterranean torrents. Moreover, in addition to the accuracy, other factors affect the choice of software by stakeholders (users, modellers, researchers, etc.). This study introduces a &ldquo

Modelling wet and dry spells for daily rainfall data series: an application to irrigation management in North-West Italy

2016

Rainfall time variability is relevant for agricultural production. The daily time scale is often used in modelling crop and soil water balance. In this work a novel statistical analysis of wet and dry spells is presented, together with an application in an Italian area characterised by a relevant climate spatial variability, due to the presence of both high mountains (e.g.: Mont Blanc) and of the Mediterranean Sea. Statistical analysis of the sequences of rainy days, wet spells (WS), and that of no-rainy days, dry spells (DS), could be carried out separately (as widely applied in the past) or jointly, by introducing the inter-arrival time (IT), representing the time elapsed between two subs…

Recurrent daily rainfall patterns over South Africa and associated dynamics during the core of the austral summer

2010

This paper investigates the influence of some modes of climate variability on the spatio-temporal rainfall variability over South Africa during the core of the rainy season, December to February (DJF). All analyses are based directly on the rainfall field instead of atmospheric processes and dynamics. An original agglomerative hierarchical clustering approach is used to classify daily rainfall patterns recorded at 5352 stations from DJF 1971 to DJF 1999. Five clusters are retained for analysis. Amongst them, one cluster looks most like the rainfall and circulation mean picture. Another one, representing 37% of the days, describes strong negative rainfall anomalies over South Africa resultin…

Ethnographic context and spatial coherence of climate indicators for farming communities : a multi-regional comparative assessment

2015

Accurate seasonal predictions of rainfall may reduce climatic risks that farmers are usually faced with across the tropical and subtropical zones. However, although regional-scale seasonal amounts have regularly been forecasted since 1997/98, the practical use of these seasonal predictions is still limited by myriad factors. This paper synthesizes the main resultsof a multi-disciplinary ethnographic and climatic project (PICREVAT). Its main objective was to seek the climatic information ? beyond the seasonal amounts ? critical for crops, both as an actual constraint to crop yields and as identified by the current and past practices and perceptions of farmers. A second goal was to confront t…

Fire Responses to the 2010 and 2015/2016 Amazonian Droughts

2019

Extreme droughts in Amazonia cause anomalous increase in fire occurrence, disrupting the stability of environmental, social and economic systems. Thus, understanding how droughts affect fire patterns in this region is essential for anticipating and planning actions for remediation of possible impacts. Focused on the Brazilian Amazon biome, we investigated fire responses to the 2010 and 2015/2016 Amazonian droughts using a remote sensing data. Our results revealed that the 2015/2016 drought surpassed the 2010 drought in intensity and extent. During the 2010 drought, we found a maximum area of 846,800 km2 (24% of the Brazilian Amazon biome) with significant (p<0.05) rainfall decrease in the f…

Pragmatic a priori knowledge : a pragmatic approach to the nature and object of what can be known independently of experience

2011

FOR SOMETHING THAT WAS OURS… NOW IT BELONGS TO ALL OF HUMANITY”: WORLD HERITAGE AS THE EXPRESSION OF CONFLICTS

2020

Resumen: En este artículo nos interesa reflexionar sobre la naturaleza conflictiva del patrimonio, que suele ser silenciada por su potente imaginario como capital cultural, económico y social y como signo de distinción. A través de un análisis detallado del proceso mediante el cual el tango y las fallas pasaron a formar parte de la Lista Representativa del Patrimonio de la Humanidad, nos adentramos en las dimensiones hegemónicas y de los procesos patrimoniales, así como en la esencia beligerante de las resistencias locales que se enfrentan a las lógicas del patrimonio neoliberal. Estos casos nos permiten vislumbrar las relaciones conflictivas que a menudo se establecen entre distintas lógic…

Source shape and data analysis procedure effects on hydraulic conductivity of a sandy-loam soil determined by ponding infiltration runs

2017

Performing ponding infiltration runs with non-circular sources could represent a good means to sample completely an area of interest. Regardless of the shape of the source, predicting the expected reliability of the collected data by infiltrometers should facilitate soil hydraulic characterisation and also allow a more conscious use of the field data. The influence of the shape of the infiltration source (i.e., circular or square) and the analysis procedure of the steady-state infiltration data on the saturated hydraulic conductivity, Ks, of a sandy-loam soil was tested in this investigation. Circular and square surfaces sampled with the pressure infiltrometer (PI) yielded similar estimates…