STUDY OF FILLING LOSSES DAILY DISCHARGE DATA WITH HEC-HMS PROGRAM IN UPPER CITARUM RIVER BASIN

• Main Author: DINIYAH - NIM: 95015305, ROSIDATU
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/30691
• Institution: Institut Teknologi Bandung

<p align="justify">River discharge, with the distribution in space and time, are important information for planning of water structures. Given the flow discharge varies greatly over time, it is necessary to observe the discharge data for a long time. But in fact very often encountered incomplete data, there is a blank data (missing record) on the data coherent time. To overcome the missing discharge data can be used rainfall runoff model (HEC-HMS), using rain data and some parameters of the watershed as input. <br /> <br /> This research created to fill missing daily discharge data use hydrology model rainfall runoff (rainfall-runoff relationship) HEC-HMS in upper citarum basin. For continuous flow, calculation in the HEC-HMS use deficit and constant method, rate loss for loss models, Clark’s UH for direct runoff models, reservoir linier for baseflow models, and Muskingum change for the routing models. <br /> <br /> This research uses year data 2005-2011, which is divided into several stages: calibration (2005-2008), verification (2009-2011) and simulation (2005-2011 and dry wet years). The results showed the value of Nash and Sutcliffe, Root Mean Square Errors (RMSE) and Correlation Coefficient, for each calibration were 0.667, 47.8 m3 / s and 0.85, for verification of 0.521, 74.2 m3 / s and 0.787 respectively simulation 585, 60.5 m3 / s, and 0.813. These values indicate that the simulated model debit has a pattern similar to or close to the observational discharge and has a good correlation to the observed discharge data as well. This condition indicates that the HEC-HMS model simulation results are good enough to overcome the problem of data availability in the post which has data void at certain times, for forecasting flow debit data if certain post has limited debit data, used for reference quality control discharge data for subsequent years and used for water availability analysis. The result of rain flow modeling using HEC HMS has model reliability using field rain input data better than the use of rain satellite data TRMM 3B42, but this TRMM data can be used for region solution that there is no rain post. Based on Simulation in wet year, normal year and dry year, it can be seen that HEC HMS model is more effective for analysis in normal year and dry year.<p align="justify">