1Delft University of Technology, Water Management Department, Delft, the Netherlands
2Delft University of Technology, Geosciences and Remote Sensing Department, Delft, the Netherlands
3Princeton University, Hydrometeorology Group, Princeton, USA
Received: 29 Sep 2016 – Discussion started: 04 Oct 2016
Abstract. Urban catchments are typically characterised by a more flashy nature of the hydrological response compared to natural catchments. Predicting flow changes associated with urbanisation is not straightforward, as they are influenced by interactions between impervious cover, basin size, drainage connectivity and stormwater management infrastructure. In this study, we present an alternative approach to statistical analysis of hydrological response variability and basin flashiness, based on the distribution of inter-amount times. We analyse inter-amount time distributions of high-resolution streamflow time series for 17 (semi-)urbanised basins in North Carolina, USA, ranging from 13 to 238 km2 in size. We show that in the inter-amount-time framework, sampling frequency is tuned to the local variability of the flow pattern, resulting in a different representation and weighting of high and low flow periods in the statistical distribution. This leads to important differences in the way the distribution quantiles, mean, coefficient of variation and skewness vary across scales and results in lower mean intermittency and improved scaling. Moreover, we show that inter-amount-time distributions can be used to detect regulation effects on flow patterns, identify critical sampling scales and characterise flashiness of hydrological response. The possibility to use both the classical approach and the inter-amount-time framework to identify minimum observable scales and analyse flow data opens up interesting areas for future research.
Revised: 15 Mar 2017 – Accepted: 17 Mar 2017 – Published: 13 Apr 2017
ten Veldhuis, M.-C. and Schleiss, M.: Statistical analysis of hydrological response in urbanising catchments based on adaptive sampling using inter-amount times, Hydrol. Earth Syst. Sci., 21, 1991-2013, doi:10.5194/hess-21-1991-2017, 2017.