Wyniki wyszukiwania - BazTech

1

An assessment of the quality of near-real time GNSS observations as a potential data source for meteorology

Dymarska N., Rohm W., Sierny J., Kapłon J., Kubik T., Kryza M., Jutarski J., Gierczak J., Kosierb R.

Meteorology Hydrology and Water Management. Research and Operational Applications

|

2017

|

Vol. 5, Iss. 1

3--13

EN

The Global Navigation Satellite System (GNSS) can be used to determine accurate and high-frequency atmospheric parameters, such as Zenith Total Delay (ZTD) or Precipitable Water Vapour (PW), in all-weather conditions. These parameters are often assimilated into Numerical Weather Prediction (NWP) models and used for nowcasting services and climate studies. The effective usage of the ZTDs obtained from a ground-based GNSS receiver’s network in a NWP could fill the gap of insufficient atmospheric water vapour state information. The supply of such information with a latency acceptable for NWP assimilation schemes requires special measures in the GNSS data processing, quality control and distribution. This study is a detailed description of the joint effort of three institutions – Wrocław University of Environmental and Life Sciences, Wrocław University, and the Institute of Meteorology and Water Management – to provide accurate and timely GNSS-based meteorological information. This paper presents accuracy analyses of near real-time GNSS ZTD validated against reference ZTD data: the International GNSS Service (IGS) from a precise GNSS solution, Weather Research and Forecasting (WRF) model, and radiosonde profiles. Data quality statistics were performed for five GNSS stations in Poland over a time span of almost a year (2015). The comparison of near real-time ZTD and IGS shows a mean ZTD station bias of less than 3 mm with a related standard deviation of less than 10 mm. The bias between near real-time ZTD and WRF ZTD is in the range of 5-11 mm and the overall standard deviation is slightly higher than 10 mm. Finally, the comparison of the investigated ZTD against radiosonde showed an average bias at a level of 10 mm, whereas the standard deviation does not exceed 14 mm. Considering the data quality, we assess that the NRT ZTD can be assimilated into NWP models.

2

Non-damaging flow below the Mietków reservoir on the Bystrzyca river

Kosierb R.

Meteorology Hydrology and Water Management. Research and Operational Applications

|

2013

|

Vol. 1, Iss. 1

9--14

EN

Non-damaging flow below storage reservoirs is one of the key factors which affect proper water management, especially the protection of valleys against flooding. Following analysis of river flow capacities below reservoirs it should be noted that, over the years, these capacities are subject to significant limitations. This is usually caused by inappropriate floodplain management. Buildings are often built closer to the river channels, which in consequence causes flooding of the buildings at low flood discharges. Repeated inundations and thus increasing losses oblige the local authorities to maintain low outflows from reservoirs in the first phase of the freshet, which leads to a rapid fulfillment of flood reserves of the reservoirs. Then, the culmination of flood wave often takes place when the reservoirs are filled and consequently high discharges from the reservoirs must be realized. This causes flooding of the areas and buildings below the storage reservoirs. This situation could have been avoided if the riverbeds and floodplains had been adjusted to pass non-damaging flow and adopted it as the basis for the water management of a given reservoir. A significant improvement in reduced reservoir capacities will occur if the values of non-damaging flow below the reservoirs are increased and the losses caused by flood flow are significantly reduced by appropriate spatial development of the areas below the storage reservoirs. The current non-damaging flow below the Mietków reservoir is a striking example of the issue. Three farms located within the floodplain of the Bystrzyca river have an adverse impact on water management of the reservoir when floods take place.

3

Gospodarka wodna na zbiornikach retencyjnych Otmuchów-Nysa podczas wezbrania w czerwcu 2009 r

Kosierb R.

Gospodarka Wodna

|

2011

|

Nr 7

274-277

PL

Zbiorniki retencyjne Otmuchów i Nysa znacznie zredukowały wezbranie na Nysie Kłodzkiej w czerwcu 2009 r. Stosując jednak zasady gospodarki wodnej na zbiornikach kaskady Nysy Kłodzkiej, opracowane przez autora niniejszego artykułu, redukcję można by jeszcze zwiększyć.

EN

The retention reservoirs Otmuchów and Nysa significantly reduced the flood wave on Nysa Kłodzka in June 2009. However, if the principles of water management on the Nysa Kłodzka cascade, elaborated by the author of this article, were applied, this reduction could have been more significant.

4

Assessment of riverbed erosion process of middle Odra River on Malczyce-Ścinawa section

Parzonka W., Kosierb R.

Studia Geotechnica et Mechanica

|

2010

|

Vol. 32, nr 1

81-90

EN

The assessment was carried out on the basis of hydrometric parameters at the river gauging stations of Malczyce (km 304.8) and Ścinawa (km 331.8), as well as periodic measurements of the riverbed conditions performed by the Regional Water Administration in Wrocław. This analysis was supplemented by the measurement results of the Wrocław University of Environmental and Life Sciences concerning the bed load transportation on the Odra River section between Brzeg Dolny and Głogów, taking into account the erosion process of the riverbed pavement. The volume of eroded bed material in the period 1958-2005 equals about 4.5 million m3. The continual erosion has a negative impact on the navigation in the river as well as on the environment and agriculture in the valley. The solution to the problem consists in: o the one-time filling of the eroded areas with the appropriate material (on the section under survey), o the systematic feeding of the Odra riverbed with bed load, just below the Malczyce Weir, after the passage of annual floods.

5

Zmiany pojemności zbiorników retencyjnych kaskady Nysy Kłodzkiej

Kosierb R.

Gospodarka Wodna

|

2010

|

Nr 2

68-72

PL

Przedstawiono przebieg zmian pojemności zbiorników retencyjnych na Nysie Kłodzkiej spowodowany zarówno procesami sedymentacyjno-erozyjnymi, jak również działalnością gospodarczą.

EN

The article presents the course of changes in capacity of the retention reservoirs on Nysa Kůodzka, caused by sedimentation and erosion processes as well as economic activity of people.

6

Koncepcja modernizacji systemu regulacji Odry środkowej

Kosierb R., Parzonka W.

Gospodarka Wodna

|

2008

|

Nr 8

318-322

PL

Program modernizacji systemu żeglugowego Odry zakłada działania zmierzające do dostosowania Odrzańskiej Drogi Wodnej do parametrów III klasy, lecz z uwzględnieniem regionalnych potrzeb i możliwości osiągnięcia na wybranych odcinkach rzeki wyższych parametrów odpowiadających wymogom międzynarodowym. Elementem technicznej modernizacji dla Odry skanalizowanej, gdzie głębokości tranzytowe w okresie całego sezonu żeglugowego są gwarantowane w wysokości 1,80 m, jest głównie unowocześnienie techniczne i usprawnienie eksploatacyjne jazów i śluz. Natomiast na Odrze swobodnie płynącej, między Malczycami (km 305) a ujściem rzeki Nysy Łużyckiej (km 542,4), proponuje się wykonanie regulacji rzeki opartej na budowlach podłużnych, względnie na mieszanym systemie regulacji opracowanej przez doc. Janusza Wierzbickiego z Politechniki Warszawskiej. Mieszany system regulacji polega na wznoszeniu tam podłużnych opasek brzegowych i poprzeczek po stronie brzegu wklęsłego i ostróg po stronie brzegu wypukłego. Regionalny Zarząd Gospodarki Wodnej we Wrocławiu zamierza sprawdzić skuteczność koncepcji doc. Janusza Wierzbickiego na odcinku pilotowym, w km 480 do km 498, który ma dziś najgorsze parametry nawigacyjne i hydrauliczne.

EN

The programme of the Oder river navigation system modernisation assumes actions aiming at adapting the Oder Water Trail to the 3rd class parameters, taking into consideration the regional needs and possibilities to achieve higher parameters corresponding to international requirements on chosen river sections. The element of technical modernisation of the canalised Oder, where transit depths for the entire navigation season are guaranteed at the level of 1,80 m, consists mainly of the technical modernisation and exploitation improvement of locks and dams. For the non-canalised section of Oder, between Malczyce (305th km) and the estuary of the Nysa Łużycka river (542,4th km), the conception proposes to regulate the river with the use of longitudinal constructions or with a mixed system of regulation elaborated by assistant professor Janusz Wierzbicki from the Warsaw University of Technology. The mixed regulation system is based on construction of longitudinal dams, riverbank casing and crossbars at the side of the concave bank and groynes on the side of the relief bank. The Regional Water Management Board in Wroclaw intends to verify the effectiveness of the assistant professor Janusz Wierzbicki's conception on the pilot section, between the 480th and 498th km, at present having the worse navigation and hydraulic parameters.

7

Zadania inwestycyjne i utrzymaniowe z zakresu ochrony przeciwpowodziowej realizowane przez Regionalny Zarząd Gospodarki Wodnej we Wrocławiu w latach 1997-2007

Kosierb R.

Gospodarka Wodna

|

2007

|

Nr 7

308-311