Flood Runoff Responses to T1330 (Haiyan) of Rivers in Leyte Island, Philippines

Abstract

(Aoba 468-1 Aoba Sendai-shi Miyagi, 980-0845, Japan) 4 フェロー会員 工博 東北大学教授 災害科学国際研究所 (〒980-0845 宮城県仙台市青葉区荒巻字青葉468-1)Typhoon No.1330 (Haiyan) that struck the Philippines on November 8, 2013 caused over 7,000 casualties by remarkably high wind speed, storm surges and waves. In this paper, hydrologic responses to T1330 of the rivers in Leyte Island, Philippines were investigated based on the GSMaP satellite driven rainfall data, observed water depth in the rivers and an application of a rainfall runoff model to a river basin. From the analysis, several different responses to T1330 of the rivers were observed because of the differences of the rainfall patterns, spatial scales and characteristics of the basins. Furthermore, we confirmed that the applied rainfall runoff model relatively well reproduced the observed flood condition in the Lingayon River under limited data conditions. Also, a basic numerical test was conducted in order to evaluate storm surge-flood coupling effects on water levels in the downstream of the Lingayon River.

Storm surge mapping of typhoon Haiyan and its impact in Tanauan, Leyte, Philippines

“…Typhoon Haiyan and gather related information (see to 20:00 November 9); however, there are concerns regarding uncertainties and biases in the rainfall data [16]. In accordance with the testimonies of the residents, the water height near the river was between 50 cm and 1 m. Tacloban [18].…”