Simulate the outflow of la nga river basin (or sub basin) by the HEC HMS model, find out the set of model parameters after calibration and validation, and analyze the results

HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY FACULTY OF ENVIRONMENT AND NATURAL RESOURCES DEPARTMENT OF ENVIRONMENTAL ENGINEERING PROJECT WORK: Environmental Hydrology Simulate the outflow of La Nga River basin (or sub-basin) by the HEC-HMS model, find out the set of model parameters after calibration and validation, and analyze the results Supervisor: Assoc Prof Huynh Cong Hoai Dr Nguyen Thi Thuy Hang EN2023 La Dang Khoa-1852472 CC001 Course code: Group member: Class: Ho Chi Minh City, 1st October 2022 0 Table of Content Part I I Introduction of La Nga river: 1.1 Location of La Nga River – Phu Ngoc catchment 1.2 Input Data .6 II Catchment delineation 2.1 The concept of catchment delineation 2.2 Catchment delineation method III Discussion on the results 15 0 Table of Figure Figure Location of La Nga river Figure 2: Phu Ngoc catchment - Lam Dong, Binh Thuan, Dong Nai provinces (La Nga River) (107.315 0E, 11.098 0N) Figure 3: Collecting information from earthdata.nasa.gov Figure 4: Datas are inputed Figure 5: Result of using “Mosaic to new raster” Figure Result of using "Fill" tool 10 Figure Result of using "Flow Direction" tool 11 Figure 8: Result of using "flow accumulation" 12 Figure 9: Result of using “raster calculation” tool 13 Figure 10: Result of “watershed” tool 14 Figure 11: Result of calculating catchment area 15 0 Part I I Introduction of La Nga river: La Nga is the name of a river which located at the southern of Vietnam and also a tributary of Dong Nai River La Nga river originates in Di Linh plateau flowing along Bao Loc city of Lam Dong province, It flows through Lam Dong, Binh Thuan and Dong Nai provinces for over 272 km and has a catchment area of 4,710 km² and finishes at Tri An lake 1.1 Location of La Nga River – Phu Ngoc catchment: Figure Location of La Nga river 0 Phu Ngoc is a commune of Dinh Quan District, Dong Nai Province, Vietnam Figure 2: Phu Ngoc catchment - Lam Dong, Binh Thuan, Dong Nai provinces (La Nga River) (107.315 0E, 11.098 0N) 0 1.2 Input Data: From https://search.earthdata.nasa.gov/, we can collect data with this code “C1575726572-LPDAAC_ECS”, use rectangle tools scan the needed research area and then download it The ASTER Global Digital Elevation Model (GDEM) Version (ASTGTM) provides a global digital elevation model (DEM) of land areas on Earth at a spatial resolution of arc second (approximately 30 meter horizontal posting at the equator) The development of the ASTER GDEM data products is a collaborative effort between National Aeronautics and Space Administration (NASA) and Japan’s Ministry of Economy, Trade, and Industry (METI) The ASTER GDEM data products are created by the Sensor Information Laboratory Corporation (SILC) in Tokyo 0 Figure 3: Collecting information from earthdata.nasa.gov II Catchment delineation 2.1 The concept of catchment delineation Catchment is the area contributing to the discharge at a particular river cross section The size of catchment increases if the point is selected as outlet moves to the downstream of river Delineation is based entirely on topographic and river network information The catchment boundary to any required (usually gauged) point on the river network is defined by applying GIS tools to an appropriate digital elevation model 2.2 Catchment delineation method a Manual Delineation – Hand-drawing watersheds on the map b Automatic Delineation (Digital Elevation Model DEM Based) – Use Hydrology tool in ArcGIS It is a geographic information system for working with maps and geographic information maintained by the Environmental Systems Research Institute 0 In this research, I use Arcmap10.5 to automatically preform catchment delineation from the given “https://search.earthdata.nasa.gov/” by following these steps: Step 1: Download DEM This step has been described in “1.2 input data” Step 2: Combine multiple raster datasets Figure 4: Datas are inputed To combine multiple raster datasets, using the “mosaic to new raster” tool from “catalog” or we can search this tool by press “Ctrl + F” 0 Figure 5: Result of using “Mosaic to new raster” Step 3: Fill DEM to remove gaps and errors 0 Figure Result of using "Fill" tool Step 4: Calculate Flow Direction 0 Figure Result of using "Flow Direction" tool Step 5: Calculate Flow Accumulation 0 Figure 8: Result of using "flow accumulation" Step 6: Create Stream Network Set ‘FlowAccumulation’ > 40,000 0 Figure 9: Result of using “raster calculation” tool Step 7: Create watershed Pour points Watersheds are defined by outlets (pour points) • Pour points should be placed in high-flow pathways • Basins will be generated from pour point to ridgeline or to upstream sub-basin • Pour points should be numerically coded per sub-basin • Pour points must be converted to a grid layer Step 8: Create watershed boundary After combining pour point and flow direction, we have watershed boundary 0 Figure 10: Result of “watershed” tool 0 Step 9: Calculate area of the catchment Figure 11: Result of calculating catchment area 2.3 The area of La Nga river – Phu Ngoc catchment According to figure 11, the area of Phu Ngoc catchment is 646.032774 km2 III Discussion on the results This article is a small research about the Phu Ngoc river catchment It showed the way how we apply GIS to delineate the catchment of Phu Ngoc There were some problems while program were running like program stop working, time-consuming in using fill tool, some errors appear, etc However, Arcmap 10.5 is automatic useful program that we can use for catchment delineation, which is much easier than hand-writing ArcGIS creates maps that require categories organized as layers Each layer is registered spatially so that when they’re overlaid one on top of another, the program lines them up properly to create a complex data map The base layer is almost always a geographical map, pulled out of a range of sources depending upon the visualization needed (satellite, road map, etc) 0 ... river: La Nga is the name of a river which located at the southern of Vietnam and also a tributary of Dong Nai River La Nga river originates in Di Linh plateau flowing along Bao Loc city of Lam... 11: Result of calculating catchment area 2.3 The area of La Nga river – Phu Ngoc catchment According to figure 11, the area of Phu Ngoc catchment is 646.032774 km2 III Discussion on the results. .. 2.1 The concept of catchment delineation Catchment is the area contributing to the discharge at a particular river cross section The size of catchment increases if the point is selected as outlet