Open Access Open Access  Restricted Access Subscription or Fee Access

Applicability of Instantaneous Unit Sediment Graph Model in an Iranian Large Watershed

S. H. R. Sadeghi, T. Mizuyama, J.K. Singh, B. Tofighi


Development of the sediment graph which is the temporal distribution of sediment load during flood incidents is essentially required for accurate estimation of sediment yield of the watershed. Unfortunately, sufficient information and data with which to estimate the sediment graph are rarely available and often can only be obtained through a costly field survey or equipping. Development of the sediment graph models based on the easily accessible physical characteristics of a watershed and precipitation data is therefore a viable and convenient tool for the efficient control of soil erosion and sediment yield. The instantaneous unit sediment graph (IUSG) described herein produced as the product of the instantaneous unit hydrograph (IUH) and the sediment concentration distribution is supposed as one of the convenient procedure leading to develop sediment graphs. In the present study, an attempt has been made to develop a conceptual model of an IUSG for suspended sediment prediction in the Khanmirza watershed in Iran comprising an area of 395 km2. The procedure involved the translation of the rainfall and the attenuation by routing of the sediment through a cascade of identical linear reservoirs to the watershed outlet applying the Clark and Muskingum approaches. Simulated sediment graphs generated by convolution of IUSG compared acceptably with the respective observed data. The results also showed that the model has the considerable potential in watersheds where no comprehensive data exists.


Sediment Graph, Instantaneous Unit Sediment Graph, Sediment Concentration, Khanmirza Watershed, Iran

Full Text:


Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.