Wyniki wyszukiwania - AGRO

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Study of water management on rainfed land in downstream Renggung watershed

100%

Fahrudin F., Idris M. H., Mahrup M.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2017

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tom 05

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nr 1

The downstream area of Renggung Watershed is a water conservation zone which is also dominated by rainfed land with dominant vertisol soil-clay fraction. Watershed downstream reaches 40% and is 30% of total area of Renggung Watershed. Rainfed farming is a factor in dry land farming, but the presence of rainfed land in downstream Renggung watershed does not receive intensification treatment as water becomes a limiting factor for plant growth. About 87-90% rainfall events in downstream Renggung watershed happen during the rainy season, from November to April, with 3-4 wet months, while about 10-13% happen during the dry season, from May to October. This means that water is abundant in wet months, but there is a shortage of water during the dry period. Based on zone group, 72% of potential water from rainfall occurs in the downstream zone, 18.3% occurs in the middle zone, and 10.4% in the upstream zone. Three quarters of potential water from rainfall occurs in downstream. Water management on rainfed land in downstream Renggung watershed is still not optimum, which is caused by (a) dependence on supply of water downstream from HLD BR, but discharge has declines in the last six months; (b) poor water management at the farming level, because plants are not cultivated in the right season; and (c) poor management institutions and water user groups, so forums to facilitate and mediate issues in terms of management and use of irrigation water is not optimal.

2

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Predicted small catchment responses to heavy rainfalls with SEGMO and two sets of model parameters

100%

Krajewski A., Lee H., Hejduk L., Banasik K.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2014

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tom 46

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nr 3

The study tests the ability of hydrological part of SEGMO (SedimentGraph Model), i.e. lumped parametric rainfall-runoff procedure of SEGMO to simulate design storm runoff in a Korean catchment. The aim of the investigation is to predict responses of small catchment of the Jeungpyeong river, located in central part of South Korea, with the area of 133.6 km2, to 100-year rainfall events, applying SEGMO and using two parallel approaches for model parameter estimation. The first approach is based on catchment characteristics and USDA-SCS procedures, which is suitable for ungauged basins, and the other one is based on rainfall-runoff measurements. The way of estimation of model parameters has been demonstrated. Finally, the model outputs are compared. The difference in largest peak discharges obtained from SEGMO with the two sets of model parameters, i.e. when estimated on the base of catchment characteristics and USDA-SCS procedures, and on the base of rainfall-runoff measurements were relatively small, approaching 37%. This investigation can be seen as checking the uncertainties in model parameter estimation and their influence on flood flows.

3

Nowcasting of rainfall based on extrapolation and evolution algorithms. Preliminary results

86%

Giszterowicz M., Osrodka K., Szturc J.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2018

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tom 17

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nr 4

4

Estimation of lag times of rainfall events for three small river basins

86%

Barszcz M., Banasik K., Tonsmann F.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

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2006

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tom 09

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nr 2

Lag time of runoff – Lag is one of the characteristic values in rainfall-runoff modeling and lag time of sediment yield – LagS is an important characteristic in the procedure of predicting the suspended sediment rate (sedimentgraph). The relationship between the lag times (LagS/Lag) is used for estimating sediment routing coefficient – B, which is a key parameter of the instantaneous unit sedimentgraph (IUSG). The IUSG formula is needed to transform the sediment produced during rainfall into sedimentgraph. The relationship LagS/Lag was examined for a three small basins (two of which are located in Poland, and one in Germany). The ratio LagS/Lag, estimated for events from the investigated basins, has been in the range from 0.49 to 1.11. A statistical significant correlation has been found between the value of LagS/Lag and rainfall depth in one of the basins.

5

Rainfall and water conditions in the region of the upper glacial in Europe

86%

Szwejkowski Z., Draganska E., Cymes I., Timofte C. M., Suchecki S., Craciun I.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2017

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tom 05

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nr 1

The article contains descriptive statistics on rainfall in an area of the southern part of the last ice age in Europe, and which now comprises the north-eastern part of the Poland. The study covers the period of 1981-2010. The sums of the annual and monthly precipitation were calculated, while years and months were evaluated in relation to the multi-annual and monthly averages. The frequency of daily precipitations was also determined. Values of SPI (Standarized Precipitation Index) were calculated together with the values of the Selianinov Index, which measures the environmental aspect of precipitation. The average annual rainfall showed a spatial heterogeneity in the region from 700.1 mm (Elblag in the north-west) to 555.3 mm (Mława) in the east and south-east. The greatest precipitation occurred in the last decade of the analysed period of thirty years. However, statistical analysis shows no significant trend change in precipitation during this period. The number of years with sums of precipitation below 75% of the normal turned out to be very small. In the annual cycle, summer precipitation prevailed. On a monthly basis, the averages sometimes exceeded the multiyear averages by as much as 200%, while extreme lows in monthly precipitation reached levels below 25% of the long-term averages. The calculated value of the SPI indicated that the most common drought conditions occurred in May and June; such droughts did not occur in April and July. The Selianinov Index indicates that the least favorable hydrothermal conditions occur in April and May, while the most favorable conditions occur in August and September.

6

Probable rainfall in Gdansk in view of climate change

86%

Szpakowski W., Szydlowski M.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2018

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tom 17

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nr 3

One of the manifestations of climate changes is the occurrence of a greater number of precipitation events, characterized by greater rain intensity that affects the economic stability of cities. Gdańsk is an example of a city in which such events have occurred since the beginning of the twenty-first century. Due to the altitude differences in the area of Gdańsk city (between –2 m and 180 m a.s.l.), the occurrence of extreme atmospheric precipitation almost immediately causes hydrological effects in the water network consisting of several streams of montane character, which flow eastwards from the plateau of the Kashubian Lakeland. Meteorological stations of the National Meteorological Service (IMGW-PIB) are located in the coastal zone (Port Północny/Northern Port, Świbno) and in the highest part of the city (the Rębiechowo airport). Because this is insufficient, the city of Gdańsk has been expanding the local rain monitoring network since 2001, currently having reliable 10-year observation data sequences. The said network is operated by the Gdańsk Water municipal company. Climate changes resulting in different characteristics of rainfall episodes in Gdańsk naturally influence the determination of the probability of their occurrence. According to the rainfall model developed by Bogdanowicz and Stachy at the turn of the 20th and 21st centuries, at least 4 rainfall events lasting for over 8 hours in the last 17 years should be classified as a 100-year rain event. One of these extended the parameters of a 300-year rain event; whereas we asses the rain in the year 2016, when even 170 mm of rainfall was recorded on July 14, as at least a 500-year rain event. During this period, several-minute events were also recorded, which also exceeded the parameters of a 100-year rain event. The paper presents precipitation models for the region of Gdańsk. Based on the maximum annual daily rainfall from Rębiechowo meteorological station from the years 1974–2017, an analysis of changes in precipitation values corresponding to certain probabilities of occurrence was conducted. An assessment was also made of the projected decrease in the value of precipitation in relation to hydro-technical constructions, road-engineering structures, and rainwater drainage systems in view of changing legal regulations, as well as the latest trends related to the management of rainwater.

7

Characteristics of precipitation conditions in Domaniow

86%

Policht-Latawiec A., Skowera B.

Teka Komisji Ochrony i Kształtowania Środowiska Przyrodniczego

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2013

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tom 10

8

Hydrodynamic effects of flood wave travel along Targaniczanka Stream

86%

Florek J., Struzynski A., Mucha J.

Acta Scientiarum Polonorum. Formatio Circumiectus

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2007

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tom 06

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nr 4

37-48

9

Comparison of water needs of true millet in the region of Bydgoszcz and Wroclaw

86%

Rolbiecki S., Chmura K.

Infrastruktura i Ekologia Terenów Wiejskich

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2015

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nr III/2

10

Analysis of rainfall-induced shallow landslides in Jamne and Jaszcze stream valleys (Polish Carpathians) – preliminary results

86%

Zydron T., Bucala A., Demczuk P., Gruchot A.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2016

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tom 48

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nr 1

11

The graphic method of sizing pipe reservoir for short, high-intensity rainfalls

86%

Szelag B., Kiczko A.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2014

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tom 46

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nr 3

The sizing of a storage reservoir, in order to reduce maximum water discharges in stormwater drainage systems, is one of the major topics in the civil engineering. In this article a methodology that allows identifying an optimal capacity of a pipe reservoir is proposed. Applying a simplified water flow model it was possible to bind various reservoir’s parameters (a reservoir diameter, a diameter of an outflow orifice and an outfl ow coefficient) with an infl ow hydrograph (a peak flow, a time of rising, a hydrograph fineness, a maximum discharge and a total volume). On the basis of functional relationships the nomographs were elaborated, allowing determining a desirable size of the reservoir, in a sense of a required peak reduction. The usage of the proposed methodology is presented with a simple example.

12

Assessment of the effect of rainfall dynamics on the storm overflow performance

86%

Szelag B.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

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2016

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tom 48

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nr 2

13

The effect of meteorological factors upon flowering and pod setting of faba bean [Vicia faba L.] at different sowing times

86%

Sekara A., Poniedzialek M., Ciura J., Jedrszczyk E.

Vegetable Crops Research Bulletin

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2001

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tom 54

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nr 1

14

Theoretical considerations on some elements of soil water erosion

86%

Glinski P., Kowalski D.

Journal of Water and Land Development

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2005

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nr 09

15

Irrigation effects of red beet [Beta vulgaris L.] under sandy soils conditions as affected by rainfall during the critical periods

86%

Rolbiecki S., Rolbiecki R.

Przegląd Naukowy Wydziału Melioracji i Inżynierii Środowiska

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1998

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nr 15

16

Yield prediction of vegetable plants using exponential polynomial model [EPM] and forecasts of total rainfall and mean air temperature

86%

Kuchar L.

International Agrophysics

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1994

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tom 08

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nr 3

17

Survey of winter wheat [Triticum aestivum] growing on ac Belje, Croatia

86%

Seput M., Kelecenji Z., Sipic M.

Fragmenta Agronomica

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1995

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tom 12

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nr 2

18

Sowing density- and rainfall- related yellow lupin yielding variability in pure stand and in mixtures with spring triticale

86%

Jaskulski D., Kotwica K., Jaskulska I.

Electronic Journal of Polish Agricultural Universities. Series Agronomy

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2000

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tom 03

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nr 1

The research aimed at defining the variability in the yielding of yellow lupin cultivated in pure stand and in mixtures with spring triticale in a field experiment at a varied April-July rainfall as well as a varied sowing density of both components. The experiments were carried out over 1990-1993 at the Mochełek Experiment Station of the Bydgoszcz University of Technology and Agriculture, Faculty of Agriculture. The experiments were conducted on light soil of a good rye soil suitability complex, IVa soil quality classification. The value of the rainfall variability coefficient over April-July amounted to 37.1%. The driest period rainfall amounted to 106 mm, while the most moisten period rainfall - 260 mm. It was observed that the yellow lupin yielding variability in pure stand was considerably lower than in the mixtures with spring triticale. An increasing lupin sowing density from 25 to 50-100 seeds per 1 m2, both in pure stand and in mixtures, showed a stabilising effect on the seed yield and pl.

19

Effects of some tilth structures on the retention and movement of the soil water

86%

Shangning J., Changpu S.

Bibliotheca Fragmenta Agronomica

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1997

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tom 2A

20

Evaluation of drought from rainfall data for Lokoja. A confluence of two major rivers

72%

Alatise M. O., Ikumawoyi O. B.

Electronic Journal of Polish Agricultural Universities. Series Agricultural Engineering

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2007

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tom 10

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nr 1

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