ترميم شبكه هاي هيدروگرافي رقومي گسسته با توسعه يك مدل شي گرا در محيط GIS

Improving Disconnected Stream Networks by Developing an Object Oriented Model in GIS Environment

In research or applied study projects related to watersheds, stream network data layers are one of the most important data layers to calculate watershed physical parameters, runoff, sediment, erosion and etc. These digitized spatial data layers prepared in different formats and scales often have deficiencies in connectivity with each other and flow direction. So, in the physiographic studies they can make many problems and errors. In the current research, using the author's previous research results in this relation and also with using concepts served in ArcSWAT software and ArcHydroTools, a new model, in GIS environment, has been designed and developed. In addition to solve the GIS softwares difficulties in creating artificial stream networks (from point of view of the streams number, position and also threshold definition) this model is capable of building the stream network connectivity. In this new method, the number and position of new created streams are equal to their original hydrographic networks and water flow direction in them has been corrected based on watershed flow direction pattern