Long-term changes in runoff from a small agricultural catchment

Abstract

Abstract:River runoff is an important indicator of environmental changes, which usually include climate and/or land use changes, and is also the basis of catchment water management. This study presents results of monitoring and analysis of 48-year precipitation and runoff from a small agricultural catchment located in central Poland. No land use changes in that period have been reported. Mean monthly distributions of precipitation and runoff for the long-term period showed that July was the wettest month in respect of precipitation and a drier one in respect of runoff, averaging 12.9% and 5.2% of their annual values, respectively. To evaluate the trend of three annual hydrometeorological parameters, i.e. precipitation, runoff and runoff coefficient, the Mann-Kendall test was applied. It indicated no trend in respect of precipitation, and decreasing trends of runoff and runoff coefficient at a 95% level of significance. Linear approximation of the annual runoff values indicated a decrease in runoff of ca. 1.2 mm per year for the analysed period. A few other functions were also used for better approximation of runoff data.

Analysis of the Course and Frequency of High Water Stages in Selected Catchments of the Upper Vistula Basin in the South of Poland

“…An example of ongoing investigation is the report of Banasik and Hejduk [20] that included 48 annual events of rainfall and runoff in agricultural catchment of the Zagożdżonka and showed a lack of trend in rainfall and a decreasing trend in runoff (about 1.2 mm per year) by using the Mann-Kendall test. In another study, Banasik et al [21] analyzed the impact of climatic factors on the changes in water resources in a small river catchment located in Puszcza Kozienicka forest.…”

Separating the Impacts of Climate Variation and Human Activities on Runoff in the Songhua River Basin, Northeast China

“…For instance, Banasik et al [1,2] reported a decreasing trend of runoff in the Zagożdżonka catchment in central Poland; Pekarova et al [3] showed the long-term trends and runoff fluctuations of many rivers in Europe; In China, many large rivers have experienced a strong decreasing trend in discharge (e.g., the Yellow River in Central China [4], the Tarim River in West China [5], and the Songhua River in Northeast China [6]). Factors that could have affected the change include both climatic variation (e.g., changes in precipitation and temperature) and anthropogenic activities (e.g., land use change, dam construction, and river engineering).…”

Retention and Curve Number Variability in a Small Agricultural Catchment: The Probabilistic Approach

“…here, due to the small area and agriculture-dominated land use [16]. The hydrological regime of the watershed was exhaustively presented in [21,24,25]. It is worth pointing out that in the studies of Banasik and Woodward [21], the standard behavior of CN in the asymptotic approach was revealed.…”