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All values necessary for the description of the system elements and their flow relations are summarized under the term system data (arrangement of the system elements, parameters and characteristics). The system loads generate - using the system data - at the respective elements certain system states and resulting reactions. System states describe the momentary conditions within the system and are variable over time. States and reactions are clearly assigned to individual system elements. The terms parameter and characteristic values have different meanings. Characteristics are clearly determinable features of system elements, e.g. the geometry of a pipeline or the dam height of a dam. In the sense of simulation they are considered to be unchangeable, unless they are subject of an investigation. Parameters are also characteristics of system elements, but their unambiguous determination cannot be sufficiently achieved by measurement. These are quantities that can only be measured at points but are related to larger areas (e.g. kf-value of soils) or are representative for a multitude of natural processes, e.g. a retention constant for the description of the effluent concentration from a catchment area. They are subject to calibration and verification. The knowledge of characteristics and parameters is necessary to clearly describe the behavior of the system elements and thus the entire system behavior.
All values necessary to describe the system elements and their flow relations are summarized under the term system data (arrangement of the system elements, parameters, and characteristics). The system loads generate - using the system data - at the respective elements certain system states and resulting reactions. System states describe momentary conditions within the system and are variable over time. States and responses are assigned to individual system elements. The terms parameter and characteristic values have different meanings. Characteristics are determinable features of system elements, e.g., the geometry of a pipeline or a dam. For the simulation, they are constant unless being the subject of an investigation themselves. Parameters are also characteristics of system elements, but their unambiguous determination cannot be achieved sufficiently by measurement. They can only be measured at points but are related to larger areas (e.g., kf-value of soils) or represent a multitude of natural processes, e.g., a retention constant to describe the effluent concentration from a catchment area. They are subject to calibration and verification. To determine the behavior of system elements and the overall system, it is thus necessary to know characteristics and parameters.

Version vom 24. März 2021, 09:47 Uhr

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Nachricht im Original (Begriffsdefinitionen)
Alle für die Beschreibung der Systemelemente und ihrer Fließbeziehungen notwendigen Werte werden unter dem Begriff Systemdaten (Anordnung der Systemelemente, Parameter und Kenngrößen) zusammengefasst. Die Systembelastungen erzeugen - unter Benutzung der Systemdaten – an den jeweiligen Elementen bestimmte Systemzustände und daraus resultierende Reaktionen. Systemzustände beschreiben die augenblicklichen Verhältnisse innerhalb des Systems und sind zeitlich veränderlich. Zustände und Reaktionen sind eindeutig einzelnen Systemelementen zugeordnet. 
Die Begriffe Parameter und Kenngrößen besitzen unterschiedliche Bedeutungen. Kenngrößen sind eindeutig zu bestimmende Merkmale von Systemelementen, z.B. die Geometrie einer Rohrleitung oder die Dammhöhe einer Talsperre. Im Sinne der Simulation gelten sie als unveränderlich, sofern sie nicht Gegenstand einer Untersuchung sind. Parameter sind ebenfalls Merkmale von Systemelementen, deren eindeutige Ermittlung aber nicht ausreichend durch Messung gelingt. Hierunter sind Größen zu verstehen, die nur punktweise messbar sind aber auf größere Flächen bezogen werden (z.B. kf-Wert von Böden) oder stellvertretend für eine Vielzahl von Naturvorgängen stehen, z.B. eine Retentionskonstante zur Beschreibung der Ablaufkonzentration aus einem Einzugsgebiet. Sie unterliegen einer Kalibrierung und Verifikation. Die Kenntnis über Kenngrößen und Parameter ist erforderlich, um das Verhalten der Systemelemente und damit das gesamte Systemverhalten eindeutig zu beschreiben.

All values necessary to describe the system elements and their flow relations are summarized under the term system data (arrangement of the system elements, parameters, and characteristics). The system loads generate - using the system data - at the respective elements certain system states and resulting reactions. System states describe momentary conditions within the system and are variable over time. States and responses are assigned to individual system elements. The terms parameter and characteristic values have different meanings. Characteristics are determinable features of system elements, e.g., the geometry of a pipeline or a dam. For the simulation, they are constant unless being the subject of an investigation themselves. Parameters are also characteristics of system elements, but their unambiguous determination cannot be achieved sufficiently by measurement. They can only be measured at points but are related to larger areas (e.g., kf-value of soils) or represent a multitude of natural processes, e.g., a retention constant to describe the effluent concentration from a catchment area. They are subject to calibration and verification. To determine the behavior of system elements and the overall system, it is thus necessary to know characteristics and parameters.

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