Selat Madura merupakan salah satu pusat pusat jalur pelayaran di Indonesia. Pengetahuan kondisi pasang surut bisa digunakan dalam perencanaan pelabuhan, pembuatan puncak pemecah gelombang, navigasi, dan berbagai aktifitas yang ada di suatu perairan tersebut. Tujuan penelitian ini adalah mengetahui komponen-komponen harmonik, tipe pasang surut, dan elevasi muka air di Selat Madura dengan menggunakan Metode Admiralty dan Metode Least Square. Penelitian ini dilaksanakan pada bulan desember 2015. Data pasang surut di peroleh dari BMKG stasiun Meteorologi Maritim Perak II Surabaya. Sedangkan analisa data pasang surut yang digunakan adalah Metode Admiralty dan Metode Least Square. Hasil yang diperoleh dari Metode Admiralty yaitu hasil Komponen M2 sebesar 0.432m - 0.449m, S2 sebesar 0.238m - 0.273m, N2 sebesar 0.069m - 0.120m, K2 sebesar 0.055m - 0.063m, K1 sebesar 0.444m - 0.524m, O1 sebesar 0.267m - 0.295m, P1 sebesar 0.147m - 0.173m, M4 sebesar 0.001m - 0.007m, MS4 sebesar 0.0003m - 0.0047m. Nilai Formzahl sebesar 1.01 - 1.14 (tipe pasang surut bercampur, harian ganda condong ke semidiurnal), dan memperoleh hasil elevasi muka air yaitu HHWL berkisar antara 3.108m - 3.2464m, MHWL berkisar antara 2.839m - 3.081m, MSL berkisar antara 1.498m - 1.503m, MLWL berkisar antara 0.522m - 0.616m, LLWL berkisar antara -0.250m - -0.104m. Sedangkan hasil dari Metode Least Square yaitu hasil Komponen M2 sebesar 0.449m - 0.458m, S2 sebesar 0.251m - 0.268m, N2 sebesar 0.089m - 0.095m, K2 sebesar 0.058m - 0.078m, K1 sebesar 0.414m - 0.442m, O1 sebesar 0.226m - 0.252m, P1 sebesar 0.131m - 0.152m, M4 sebesar 0.0001m - 0.0054m, MS4 sebesar 0.0003m - 0.004m. Nilai Formzahl sebesar 0.91 - 0.97 (tipe pasang surut bercampur, harian ganda condong ke semidiurnal), dan memperoleh hasil elevasi muka air yaitu HHWL berkisar antara 3.0537m - 3.1148m, MHWL berkisar antara 2.5989m - 2.6384m, MSL berkisar antara 1.497m - 1.5019m, MLWL berkisar antara 0.3604m - 0.4027m, LLWL berkisar antara -0.1168m - -0.051m. Perbedaan hasil komponen dari kedua Metode tidaklah besar, yang terbesar terdapat pada komponen K1 dan komponen O1. Sedangkan hasil nilai Formzahl dari kedua Metode menunjukkan hasil yang sama.

The strait Madura is one of the central shipping route in Indonesia. Knowledge tidal conditions can be used in planning port, making the peak breakwaters, navigation, and various activity there was in a these waters. The purpose of this research is to know components harmonic, type tidal, and elevation the water on the strait Madura by using the Method Admiralty and Method Least Square. This research was conducted in December 2015. Data tides on gathered from BMKG station Meteorologi Maritim Perak II Surabaya. While data analysis tides used is Method Admiralty and Method Least Square. The results Method Admiralty of components M2 to by 0.432m - 0.449m, S2 to by 0.238m - 0.273m, N2 to by 0.069m - 0.120m, K2 to by 0.055m - 0.063m, K1 to by 0.444m - 0.524m, O1 to by 0.267m - 0.295m, P1 to by 0.147m - 0.173m, M4 to by 0.001m - 0.007m, MS4 to by 0.0003m - 0.0047m. Formzahl value to by 1.01 - 1.14 (Type tides mixed , double daily leaning to semidiurnal), and results of elevation of water that is HHWL ranged from 3.108m - 3.2464m, MHWL ranged from 2.839m - 3.081m, MSL ranged from 1.498m - 1.503m, MLWL ranged from 0.522m - 0.616m, LLWL ranged from -0.250m - -0.104m. While The results Method Least Square of components M2 to by 0.449m - 0.458m, S2 to by 0.251m - 0.268m, N2 to by 0.089m - 0.095m, K2 to by 0.058m - 0.078m, K1 to by 0.414m - 0.442m, O1 to by 0.226m - 0.252m, P1 to by 0.131m - 0.152m, M4 to by 0.0001m - 0.0054m, MS4 to by 0.0003m - 0.004m. Formzahl value to by 0.91 - 0.97 (Type tides mixed , double daily leaning to semidiurnal), and results of elevation of water that is HHWL ranged from 3.0537m - 3.1148m, MHWL ranged from 2.5989m - 2.6384m, MSL ranged from 1.497m - 1.5019m, MLWL ranged from 0.3604m - 0.4027m, LLWL ranged from -0.1168m - -0.051m. The difference of the results a component of second Method not been great , the largest found in components K1 and components O1. While the formzahl value of both method of suggesting the same result .

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