AI SearchAdvancing flood forecasting for Northern Thailand using RRI model and data assimilation (Record no. 2561)
[ view plain ]
| 000 -LEADER | |
|---|---|
| fixed length control field | 03942nas a2200373 a 4500 |
| 005 - DATE AND TIME OF LATEST TRANSACTION | |
| control field | 20260817161747.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION | |
| fixed length control field | 260114s20259999th u ms t 000 eng d |
| 035 ## - SYSTEM CONTROL NUMBER | |
| System control number | .b12470545 |
| 099 #9 - LOCAL FREE-TEXT CALL NUMBER (OCLC) | |
| Classification number | AIT Thesis no.WM-25-10 |
| 100 1# - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Pandey, Bikram |
| 245 10 - TITLE STATEMENT | |
| Title | Advancing flood forecasting for Northern Thailand using RRI model and data assimilation |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. | |
| Place of publication, distribution, etc. | Pathum Thani, Thailand : |
| Name of publisher, distributor, etc. | Asian Institute of Technology, |
| Date of publication, distribution, etc. | 2025 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 148 leaves : |
| Other physical details | ill.+ |
| Accompanying material | 1 online |
| 490 1# - SERIES STATEMENT | |
| Series statement | Thesis; |
| Volume/sequential designation | no. WM-25-10 |
| 500 ## - GENERAL NOTE | |
| General note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | Thesis (M. Eng.) - Asian Institute of Technology, 2025 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Flooding in Northern Thailand{u2019}s Nan River Basin poses significant risks during the monsoon season due to its mountainous terrain and exposure to the monsoon trough. This study applies the physically based Rainfall Runoff Inundation (RRI) model and Particle Filter Data Assimilation (PF-DA) technique to enhance flood forecasting in the Upper Nan River Basin. The study begins by calibrating and validating the RRI model using interpolated HII rain gauge data and observed discharge at stations N1 and N64. The model performed reliably in both the 2024 calibration and the 2022 validation period, producing realistic runoff responses with positive efficiency scores, low RMSE, and acceptable bias. A grid-wise, monthly Quantile Mapping bias correction was applied to the 0.25° daily GFS rainfall to reduce systematic biases. It effectively lowered the raw GFS overestimation and improved simulated discharge, but also dampened extremes, causing underestimated flood peaks.This study applied a daily RRI-Particle Filter data assimilation (PF-DA) system using 16 particles and Gaussian system noise, with rainfall boundary coordinates as state variables and an RMSE-based likelihood. Applying PF-DA during the 2022 and 2024 monsoon seasons yielded consistent gains across a 1-10 day lead time. Daily assimilation of observed water levels refined the model states, reduced false peaks from raw GFS, and softened the strong underestimation produced by bias-corrected GFS, improving hydrograph timing and stabilizing both flooding and recession periods. Short lead gains were notable for raw GFS, where KGE exceeded 0.5 for lead days 1-3 instead of only 1-2 without assimilation. Overall improvements were substantial, as KGE rose from 0.392 to 0.494 (~ 11%) and bias dropped from +0.543 m to +0.129 m in 2022. In 2024, KGE increased from 0.331 to 0.421 (~28%) with bias reduced from +0.568 m to +0.218 m. While PF-DA significantly improved short and medium-range forecasts, long-lead performance still depends on better rainfall forcing and maintaining sufficient ensemble spread. While QM improves overall stability, it also reduces extreme rainfall, leading to underestimated peak flows, showing the need for improved bias correction methods that better preserve extremes. |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Flood forecasting |
| Geographic subdivision | Thailand, Northern |
| 650 #0 - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | Rain and rainfall |
| General subdivision | Mathematical models |
| Geographic subdivision | Thailand, Northern |
| 700 0# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Natthachet Tangdamrongsub, |
| Relator term | Chairperson |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Shrestha, Sangam, |
| Relator term | Examination Committee |
| 700 1# - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Shanmugam, Mohana Sundaram, |
| Relator term | Examination Committee |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | SET DEAN Scholarships, |
| Relator term | Scholarship Donor |
| 710 2# - ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | AIT Scholarship, |
| Relator term | Scholarship Donor |
| 810 2# - SERIES ADDED ENTRY--CORPORATE NAME | |
| Corporate name or jurisdiction name as entry element | Asian Institute of Technology. |
| Title of a work | Thesis; |
| Volume/sequential designation | no. WM-25-10 |
| 856 40 - ELECTRONIC LOCATION AND ACCESS | |
| Materials specified | Full-Text |
| Uniform Resource Identifier | <a href="http://203.159.5.9/ait-thesis/detail.php?q=B23299">http://203.159.5.9/ait-thesis/detail.php?q=B23299</a> |
| 907 ## - LOCAL DATA ELEMENT G, LDG (RLIN) | |
| a | .b12470545 |
| b | mnarc |
| c | a |
| 902 ## - LOCAL DATA ELEMENT B, LDB (RLIN) | |
| a | 260115 |
| 998 ## - LOCAL CONTROL INFORMATION (RLIN) | |
| Operator's initials, OID (RLIN) | 0 |
| Cataloger's initials, CIN (RLIN) | 260115 |
| First date, FD (RLIN) | m |
| -- | h |
| -- | a |
| -- | 0 |
| 945 ## - LOCAL PROCESSING INFORMATION (OCLC) | |
| l | mnarc |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | 67-Electronic Resource |
| 909 ## - LOCAL ITEMS USED | |
| Barcode | Barcode : - |
| CREATED | CREATED : 2026-01-14 |
| RECORD Id | RECORD # : i13566465 |
| LPATRON | LPATRON : 0 |
| LCHKIN | LCHKIN : - |
| RENEWALS | # RENEWALS : 0 |
| -- | # OVERDUE : 0 |
| -- | IUSE3 : 0 |
| -- | TOT CHKOUT : 0 |
| -- | TOT RENEW : 0 |
| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Total checkouts | Full call number | Date last seen | Copy number | Price effective from | Koha item type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Available for Loans | Asian Institute of Technology Library | Asian Institute of Technology Library | Archives | 17/08/2026 | AIT Thesis no.WM-25-10 | 17/08/2026 | 1 | 17/08/2026 | 67-Electronic Resource |