Integrating Local Scale Drainage Measures in Meso Scale Catchment Modelling

Abstract

This article presents a methodology to optimize the integration of local scale drainage measures in catchment modelling. The methodology enables to zoom into the processes (physically, spatially and temporally) where detailed physical based computation is required and to zoom out where lumped conceptualized approaches are applied. It allows the definition of parameters and computation procedures on different spatial and temporal scales. Three methods are developed to integrate features of local scale drainage measures in catchment modelling: (1) different types of local drainage measures are spatially integrated in catchment modelling by a data mapping; (2) interlinked drainage features between data objects are enabled on the meso, local and micro scale; (3) a method for modelling multiple interlinked layers on the micro scale is developed. For the computation of flow routing on the meso scale, the results of the local scale measures are aggregated according to their contributing inlet in the network structure. The implementation of the methods is realized in a semi-distributed rainfall-runoff model. The implemented micro scale approach is validated with a laboratory physical model to confirm the credibility of the model. A study of a river catchment of 88 km 2 illustrated the applicability of the model on the regional scale.

Computation of backwater effects in surface waters of tidal lowland catchments including control structures – An efficient and re-usable method implemented in the hydrological open source model Kalypso-NA (4.0)

“…In the exemplary evaluation study (see section 255 6), a water level difference of about ΔWmin=0.01 m gives sufficient results for meso scale stream segments. For local scale stream segments a difference of about ΔWmin=0.001 m gives adequate results (Hellmers, 2020) In the calculation routine a (Fig. 5), the initialisation of formal parameters of each linear and spatial data structure for the backwater effect computation is performed.…”

“…is applied in the extended algorithm to model processes in sub-catchments like the soil water balance and the downstream directed flood routing. This algorithm is explained in more details in the journal paper (Hellmers and Fröhle, 2017). 325…”

Supplementary material to "Computation of backwater effects in surface waters of tidal lowland catchments including control structures – An efficient and re-usable method implemented in the hydrological open source model Kalypso-NA (4.0)"

“…The meso scale modelling is enhanced recently to model local scale drainage measures (LSDMs). These measures are also known as sustainable urban drainage measures (SUDS) , green infrastructure (GI) or best management practice (BMP) (Hellmers and Fröhle, 2017).…”

“…Figure S2: Outline of the Kalypso project with an overview of public modules and details of the module Kalypso Hydrology as well as the extended calculation code (Kalypso-NA). Input and output parameters for backwater effect computation are processed in ASCII files within an extension folder(Hellmers, 2020).…”

Twenty-Five Years of Hydroinformatics

“…The work of Hellmers and Fröhle [61] deals with modelling the so-called green infrastructure or sustainable drainage systems (SUDS). In this paper, a theoretical approach to integrate a detailed water balance calculation of SUDS with cascading effects in a meso-scale catchment model is presented.…”