Wyniki wyszukiwania

1

Geographic record of human impact conformance to different water relationships along a coastal river (the Lupawa catchment)

100%

Drwal J., Cieslinski R., Fac-Beneda J.

Quaestiones Geographicae

|

2011

|

tom 30

|

nr 1

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

How a river course influences the species richness and ecological requirements on two opposite riverbanks in a forest area

100%

Czarnecka B., Rysiak A., Chabudzinski L.

Acta Societatis Botanicorum Poloniae

|

2015

|

tom 84

|

nr 1

The goal of the present research was to find correlations between the topographic attributes of a river valley and local ground-floor vegetation and its habitat requirements expressed by ecological indicator values (EIV), using the geographical information systems (GIS), digital elevation model (DEM), and multivariate statistical analysis. We paid special attention to the river course, which determines the differentiation in slope aspects and the amount of solar radiation reaching the ground surface. The model object was an almost latitudinal, ca. 4-km-long break section of the Sopot river, crossing the escarpment zone of the Central Roztocze Highlands, southeastern Poland. The main material comprised species lists (with estimated abundance) for each ca. 200-m-long section, according to the river valley course, separately for the left and right riverbanks, 40 sections altogether, ca. 15 000 vegetation records, and physical and chemical soil measurements. A 3-meter resolution DEM was derived from a 1:10 000 topographic map. We calculated the correlations between the topographic attributes of the valley, species richness, and the EIVs for all the species recognized in each section of the valley. We found 241 herb plant species in the ground-floor vegetation of the study area. We did not find significant differences between the two riversides (61 ±13 species per one section for the left and 63 ±17 for the right side). Thus, the parallel course of the river valley does not change the species richness on a more “sunny” and more “shiny” riverbank. However, this factor “cooperating” with other topographic attributes of the valley significantly differentiates the shape of species showing various requirements for basic habitat resources: light, moisture, soil trophy, reaction, dispersion, and organic-matter content.

3

Trend analysis of flood peaks in lower reaches of Satluj River, Himachal Pradesh, India

100%

Kumar S., Santosh

International Letters of Natural Sciences

|

2015

|

tom 46

Climate change arising from anthropogenic driven emissions of greenhouse gases has emerged as one of the most important environmental issues in the last two decades. One of the most significant potential consequences of climate change may be alteration in regional hydrological cycle and river flow regimes. Increased temperature is expected to increase the peak flows in snowfed rivers of Himalayas. The changing pattern of regional temperature on flood peaks deserves urgent and systematic attention over a basin which provides an insight view of historical trends. Lower reaches of Satluj River is selected for the present study. Testing the significance of observed trends in flood peaks has received a great attention recently, especially in connection with climate change. The data series available was 48 years (1967-2010). The records were subjected to trend analysis by using both non-parametric (Mann-Kendall test) and parametric (linear regression analysis) procedures. For better understanding of the observed trends, flood peaks were computed into standardised flood peak indices (SFPI). These standardised data series were plotted against time and the linear trends observed were represented graphically. The analysis of flood peaks at different observation stations in lower reaches of Satluj River showed a large variability in the trends and magnitudes. The trend analysis results of flood peaks and gauge heights indicate that the flood peaks at all sites i.e. Rampur, Suni and Kasol show increasing but statistically insignificant trends. The trends in gauge height at all sites are also showing increasing trend but Kasol is statistically significant at 95% confidence level. The fast melting of glaciers, incessant monsoon rainfall and the synchronisation of the discharge peaks are the main causes of river floods. The past flood peaks will help us to observe the frequency of occurrence of floods in certain region and to determine whether the flood peaks in the past have been same with that of the present or whether there is any deviation in the trend in relation to climate change. Such studies will help in designing mitigation and adaptation strategies towards extreme hydrological events.

Ograniczanie wyników

1 Acta Societatis Botanicorum Poloniae

1 International Letters of Natural Sciences

1 Quaestiones Geographicae

1 Chabudzinski L.

1 Cieslinski R.

1 Czarnecka B.

1 Drwal J.

1 Fac-Beneda J.

1 Kumar S.

1 Rysiak A.

1 Santosh

2 2015

1 2011

Geographic record of human impact conformance to different water relationships along a coastal river (the Lupawa catchment)

How a river course influences the species richness and ecological requirements on two opposite riverbanks in a forest area

Trend analysis of flood peaks in lower reaches of Satluj River, Himachal Pradesh, India