Wyniki wyszukiwania - Biblioteka Nauki

1

Hydrauliczne skutki pogłębienia toru wodnego Świnoujście-Szczecin

100%

Kurnatowski J.

Gospodarka Wodna

|

2021

|

tom Nr 11

15--18

PL

W artykule przedstawiono wyniki matematycznego modelowania rozkładu przepływów w sieci rzek i kanałów dolnej Odry po pogłębieniu toru wodnego Świnoujście-Szczecin do głębokości 12,5 m. Przeprowadzona analiza wykazuje prognozowane zmiany przepływów na poszczególnych odcinkach sieci do ok. 20% wartości sprzed pogłębiania. Budzi to obawy destabilizacji ruchu rumowiska w sieci, zwłaszcza możliwości nadmiernego zamulania niektórych odcinków.

EN

The paper presents the results of mathematical modeling of the flows distribution in the network of rivers and canals of the lower Oder after deepening the Świnoujście-Szczecin fairway to a depth of 12.5 m. The conducted analysis shows the anticipated changes of flows at individual network sections up to approx. 20% of the pre-dredging values. This raises concerns about the destabilization of sediment motion in the network, especially the possibility of excessive silting of some sections.

2

Prognozowanie dynamiki atraktora na podstawie ciągu wartości dopływu rzecznego

100%

Terlikowski T.

|

tom Z. 3-4

289-297

EN

In this part of the paper we deal with defining a prediction model which determines the future val-ues of the state on the base of a given sequence of its past values (time series). The prediction model has a form of approximation of the searched functional relationship by a polynomial of first degree (affine mapping), or by a polynomial of second degree (quadratic). The so called local model of approximation has been discussed and applied. The computations concern the data of 10 days walking average run-off the Wupper Reservoir Water System in Germany. The run-off process has the character of deterministic chaos. The respective computer programs have been written in Fortran 90. They determine the values predicted for up to three steps in the time series. The evaluation of the prediction quality, by some statistical criteria, is presented.

3

Przepływy ekstremalne wybranych rzek środkowej Polski w latach 1951-2000

88%

Jokiel P. , Uniwersytet Łódzki W. N. G.

|

2008

|

tom 8

PL

Artykuł powstał w wyniku prac badawczych prowadzonych w ramach Projektu Zamawianego MNiI (K091/P04/2004/11).

EN

The following study is an attempt to create a multiaspect statistical analysis of 50-years long sequences of monthly extreme llows of three rivers of central Poland: Warta in Sieradz, Bzura in Sochaczew and Pilica in Przedbórz (1951-2000). Those rivers play leading roles in water management of one of the poorest in surface water regions of country - central Poland. The knowledge of their regime and identification of its changes in time especially due to low and high flows is a basis for future planning and efficient water management in regional scale. Within this work functions of monthly extreme flow distributions were identified and distinct probability quantiles were calculated (fab. 1-2; Attachments I-VI). Looking at flow maxima it was noted that for snow-melt freshets months (lI, Ill, IV) the most characteristic were gamma and Weibull's distributions, while for the months of 'summer freshet (VI, VII, VIII) - gamma and log-gamma functions. In case of monthly minima was slightly different. The greatest number of sequences might have been described by Weibull's distribution, significantly smaller number by log-gamma, last two functions appeared very rarely. The biggest annual specific capacity of probability of exceeding l% characterize Pilica river. It was much bigger than analogous runoffs calculated for Warta and Bzura rivers. For Warta and Bzura annual low llows of probability of exceeding 99% were also 8 times smaller than their ecological discharges. In case of Pilica this difference was about 400% smaller. There were investigated the perennial and seasonal dynamics of extreme llows (attachments VII, IX), changeability of monthly llow amplitudes (Fig. 13, 14) as well the trends and their significance (Tab. 4). Long lasting maximum llow series for months of the same names from cold half-year were investigated in 3 rivers and characterized by negative trends (sometimes statistically significant) - Pilica (XI-IV); Bzura (II, III). The lowest flows period systematically moved from early summer (in 1951-1960) towards late summer or even early autumn (in 1991-2000). This trend was very pronounced and unambiguous. Perennial changeability of warm half-year minimum series was usually smaller than of parallel series in cold half-year. All monthly minima of Warta increased, Pilica's - decreased, while the observed tendencies for Bzura were variegated. Most of the obtained trend lines indicate on tendencies of decreasing in the series of monthly amplitudes, although statistically significant trends are characteristically arranged. Statistically significant trends occur during late winter and early spring (I-II), what is more they concern all studied rivers. The analysis indicate on a small decrease in changeability of flows in investigated rivers, which is characterized by slightly systematic increase of monthly minima and amplitude decrease. However, those phenomena are visible best during cold half-years and concern mainly month of freshets (II, III).

4

Ocena warunków hydromorfologicznych rzek w zlewniach zurbanizowanych metodą River Habitat Survey

75%

Łabaj P. , Hamerla A.

Prace Naukowe GIG. Górnictwo i Środowisko / Główny Instytut Górnictwa

|

2012

|

tom nr 4

109--121

PL

Do oceny warunków hydromorfologicznych cieków stosuje się szereg metod. Jedną z nich jest metoda oceny wód płynących River Habitat Survey (RHS), stanowiąca narzędzie do szczegółowego opisu warunków hydromorfologicznych rzek na podstawie rejestracji elementów środowiska doliny rzecznej. W celu przetestowania możliwości stosowania metody RHS do oceny warunków hydromorfologicznych rzek miejskich przeprowadzono badania na wybranych odcinkach czterech rzek przepływających przez centralną część konurbacji katowickiej. Uzyskane wyniki wykazują duże zróżnicowanie. Różnice otrzymanych wyników wystąpiły zarówno między badanymi rzekami, jak i w obrębie tego samego cieku na odcinkach ze sobą sąsiadujących. Przyczyn takiego zróżnicowania wyników, poza urozmaiconymi warunkami zlewniowymi śląskich miast, należy upatrywać w niewielkiej liczbie czynników silnie wpływających na ocenę końcową wskaźników naturalności i przekształcenia siedliska. Wskazane jest podjęcie próby zastosowania metody Urban River Survey (URS), która stanowi zmodyfikowaną wersję metody RHS, dostosowaną do warunków miejskich.

EN

To assess the stream hydromorphological conditions number of methods is used. One of them is a method of evaluating flowing waters River Habitat Survey (RHS) being a tool for the detailed description of the river hydromorphological conditions based on the registration of the environment of the river valley. In order to test the applicability of the RHS method to evaluate the hydromorphological conditions of urban rivers selected sections of four rivers flowing through the central part of the Katowice conurbation were investigated. The results show a wide variation. Differences in the results were both between the analyze drivers, as well as within the same stream on sections adjacent to each other. The reasons for this results diversity, except varied river catchment conditions of Silesian cities, should be seen in a small number of factors that strongly influence on the final evaluation indicators and natural habitat transformation. It is advisable to try to use the method Urban River Survey (URS), which is a modified version of the RHS method adapted to urban conditions.

5

Charakterystyka sieci rzecznej małej zlewni położonej w strefie krawędziowej Wyżyny Łódzkiej

75%

Bartnik A. , Tomaszewski E. , Uniwersytet Łódzki W. B. i. N. o. Z.

|

tom 5

EN

The hydrographical network is a phenomenon under constant time and space changes. These ch_anges have seasonal and multi-annual character. The dynamics of this phenomenon needs estimation not only of the network itself but also of the water moving in it. This problem becomes particularly important in the case of the areas located near urban grounds which are under intense anthropopression. It is possible then to conclude of progressive influence of human activities after recognizing of the natural factors forming hydrographical network. The Dzierżązna drainage basin was explored up to the Swoboda closing profile (42,9 km2). It is located in the northern Łódź Upland part and is drained by the Moszczenica river system (fig. l). The southern boundary of the basin is determined by the urban Zgierz suburbs. Exactly this place in Malinka, there are springs of Dzierżązna river. Hydrographical network explorations were carried out basing on the topographic map in the scale 1:25 000. Thus the obtained data were updated and verified in the field in July 1998. Analysis of the river network parameters was carried out in the capacity of a drainage density (Wilgat's and Neumann's method) and a degree of an orderly arrangement (verification of the Horton's theory after the Strahler's classification) - fig. 2, 4, tab. l, 2. The authors also made detailed estimation of each stream: a river long fall, sinuosity and development (fig. 3, tab. l). Estimation also concerns time in which water running the channels reaches the closing profile and concerns the discharge rate as well. Their space layout is represented on the maps - fig. 5, 6. In the final stage of the study the authors tried to evaluate the running water resources basing on the resources momentum measure. Thanks to using the mentioned above procedure it was possible to take account the dynamics of the resource processes, because physical unit of the presented measure is (m^4 x S^-l) They also estimated degree of concentration of the resources in the river system (fig. 7, 8).

PL

Artykuł zawiera charakterystykę sieci hydrograficznej zlewni Dzierżąznej - po wodowskaz w Swobodzie. Ocenie poddano parametry sieci, czas dobiegu wody korytami do profilu zamykającego, jak również wielkości przepływów. Określono także zasoby wód płynących i ich koncentrację na podstawie miary pędu zasobów.

6

Impact of the small water reservoir Psurów on the quality and flows of the Prosna River

63%

Wiatkowski M.

|

tom Vol. 36, no. 3

83-96

EN

The paper presents a small water reservoir Psurów located on the Prosna River (right tributary of the Warta River) in the Opolskie Voivodeship (southern Poland). Results of water quality analyses of the Prosna River flowing into the reservoir and the outflowing water, as well as water stored in the reservoir have been discussed. Water flows of the Prosna River above and below the Psurów reservoir were analyzed. The analyses were carried out from November 2006 to October 2008. The following water quality indicators were measured: PO43-, NO3-, NO2-, NH4+, BOD5, DO, water temperature, pH, electrolytic conductivity, TSS and chlorophyll a, for which basic descriptive statistics was calculated. The research showed that the small water reservoir Psurów contributed to the reduction of the following loads: phosphates (by about 21%), nitrates (by 26%), nitrites (by 9%), ammonia (by 5%) and total suspended solids (by 17%). It was found out that there was a statistically significant relationship (p < 0.05) between the volume of water flowing out of the reservoir and the inflowing water (Pearson’s correlation coefficient: r = 0.93). Based on the Vollenweider’s criterion the Psurów reservoir was classified to polytrophic reservoirs.

PL

Praca dotyczy małego zbiornika wodnego Psurów zlokalizowanego na rzece Prośnie (prawostronny dopływ rzeki Warty) w województwie opolskim (południowa Polska). W pracy przedstawiono wyniki badań jakości wody rzeki Prosny dopływającej i odpływającej ze zbiornika oraz wody retencjonowanej w zbiorniku. Wykonano także analizę przepływów rzeki Prosny powyżej i poniżej zbiornika Psurów. Badania wykonano w okresie od listopada 2006 do października 2008 r. Pomiarami objęto następujące wskaźniki jakości wody: PO43-, NO3-, NO2-, NH4+, BZT5, tlen rozpuszczony, temperaturę wody, odczyn wody, przewodność elektrolityczną, zawiesinę ogólną i chlorofil a, dla których obliczono podstawowe statystyki opisowe. Wyniki badań wykazały, że mały zbiornik wodny Psurów redukował ładunki fosforanów (średnio o 21%), azotanów (o 26%), azotynów (o 9%), amoniaku (o 5%) i zawiesiny ogólnej (o 17%). Stwierdzono, że między objętością wody odpływającej ze zbiornika Psurów a objętością wody dopływającej do zbiornika istnieje wysoka zależność (r = 0,93), istotna statystycznie na poziomie p < 0,05. Na podstawie kryterium Vollenweidera zbiornik Psurów zakwalifikowano do zbiorników politroficznych.

7

Nowoczesne metody pomiaru przepływów i transportu zawiesin w rzekach i morzach

51%

Szczuciński W.

LAB Laboratoria, Aparatura, Badania

|

2007

|

tom R. 12, nr 3

10-14